BREAKING NEWS

Aqua environmental design

The following gives an overview of
the installation of our first pond
and waterfalls. Each site will be
unique and require site specific
techniques, but this page will
illustrate that having a beautiful, satisfying water garden is certainly
in the realm of possibility for the
do it your self home owner. A
modest investment (about half the
cost of a hot tub) and some
vigorous aerobic exercise are all that's required to enjoy your own
backyard oasis. We have a six foot "hill" near the
back deck that was created when
we excavated for the root cellar.
Though not directly facing the deck
or house, it provided a good site
for a series of water falls into a pond below. On a flat site, building
up the water falls to this height may
look artificial. The abundance of
large builders at our home has
caused us plenty of extra work in
the past. Now we're able to use many of them! I dug out a spot for the BioFalls®
near the top of the hill...after
standing back and taking a long
look, we decided to lower it so the
falls would seem to come directly
out of the hill. This extra work - and time spent just looking - was
well worth it. Here we've dug out the first shelf
and have begun digging out the
second shelf. The best way to move
the soil up hill around the BioFalls®
turned out to be with 5 gal.
buckets! The soil from the pond is placed
around three sides of the BioFalls
and compacted well to avoid future
settling. We borrowed a transit to check the
level of the edge of the pond and
to verify the level of the skimmer.
The black flexible PVC lines both go
to the back of the skimmer - one is
from the pump in the skimmer, the other is an over flow which drains
into a gravel filled trench. We've completed two levels of
excavation and have marked the
lower level, which will reach the
pond's maximum depth of two
feet. It's at this level that we
usually run into the really large boulders. Sure enough, this monster had to
be coaxed out of the pond and up
the hill...I was fortunate to have a
come-along, a strong pine in the
right place, and a willing young
helper! Excavation is complete! Plant
pockets were also dug at each end
of the second level...soil will be
added to these (over the liner),
and they will be home to water
lilies - this avoids growing them in pots. This is the excavation for the
waterfalls...it's a good exercise in
visualiztion to try to determine the
course of the water. The narrow,
level spots will support the flat
waterfall stones. Large rock is placed against the
vertical walls, with gravel to follow
on the level areas. All this rock
came from our property, saving us
much material and delivery cost. Building the water falls took plenty
of patience... just the right stone in
just the right place! The waterfall
liner is 10 feet wide to allow for
plenty of splashing and for the
turns in the course of the three falls. Note that the pond liner
extends well up the course of the
falls, with a generous overlap from
the waterfall liner. Though we washed the rock and
gravel several times, and pumped
out the dirty water, the first filling
of the pond was quite dirty. After
one week, it is much clearer...two
to six weeks are required to establish a healthy ecosystem with
relatively clear water. Landscaping
around the pond began shortly
after we filled it. More Photos... Pond Kit Pricing Our Pond at Clear water Landscapes Search Design for Success Build a Landscape Free – Build a Pond Ask questions and
share information
with others Home | Services. Call us on 08032861326.

IMPORTANTS OF FEASIBILITY STUDY

Feasibility Study of a Simple
Flow-through Farm The next step is to work out how
much they can produce, looking
into all possibilities and
investigating the economy of
different models of production. To
begin with they estimate the annual production and income at a
given price, with their 120 L/sec
and the average temperature at
7°C, that is the natural conditions
The Elements of a Good Feasibility
Study By kingsway Agro Services "Those who do not do their home work do not graduate." Bryce's Law In its simplest form, a Feasibility Study represents a definition of a problem or opportunity to be studied, an analysis of the current mode of operation, a definition of requirements, an evaluation of alternatives, and an agreed upon course of action. As such, the activities for preparing a Feasibility Study are generic in nature and can
be applied to any type of project, be it for systems and software development, making an acquisition, or any other project. There are basically six parts to any effective Feasibility Study: 1.
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LOCAL FISH PROCESSING, SPOILAGE AND PRESERVATION

 The Project Scope which is used to define the business problem and/or opportunity to be addressed. The old adage, "The problem well stated is half solved," is very apropos. The scope should be definitive and to the point; rambling narrative serves no purpose and can actually confuse project participants. It is also necessary to define the parts of the business affected either directly or indirectly, including project participants and end-user areas affected by the project. The project sponsor should be identified, particularly if he/she is footing the bill. I have seen too many projects in the corporate world started without a well defined project scope. Consequently, projects have wandered in and out of their boundaries causing them to produce either far too much or far too little than what is truly needed. 2. The Current Analysis is used to define and understand the current method of implementation, such as a system, a product, etc. From this analysis, it is not uncommon to discover there is actually nothing wrong with the current system or product other than some misunderstandings regarding it or perhaps it needs some simple modifications as opposed to a major overhaul. Also, the strengths and weaknesses of the current approach are identified (pros and cons). In addition, there may very well be elements of the current system or product that may be used in its successor thus saving time and money later on. Without such analysis, this may never be discovered. Analysts are cautioned to avoid the temptation to stop and correct any problems encountered in the current system at this time. Simply document your findings instead, otherwise you will spend more time unnecessarily in this stage (aka "Analysis Paralysis"). 3. Requirements -
how requirements are defined depends on the object of the project's attention. For example, how requirements are specified for a product are substantially different than requirements for an edifice, a bridge, or an information system. Each exhibits totally different properties and, as such, are defined
differently. How you define requirements for software is also substantially different than how you define them for systems. 4. The Approach represents the recommended solution or course of action to satisfy the requirements. Here, various alternatives are considered along with an explanation as to why the preferred solution was selected. In terms of design related projects, it is here where whole rough designs (e.g., "renderings") are developed in order to determine viability. It is also at this point where the use of existing structures and commercial alternatives are considered (e.g., "build versus buy" decisions). The over riding considerations though are: Does the recommended approach satisfy the requirements? Is it also a practical and viable solution? (Will it "Play in Pough keepsie?") A thorough analysis here is needed in order to perform the next step... 5. Evaluation - examines the cost effectiveness of the approach selected. This begins with an analysis of the estimated total cost of the project. In addition to the recommended solution, other alternatives are estimated in order to offer an economic comparison. For development projects, an estimate of labour and out-of- pocket expenses is assembled along with a project schedule showing the project path and start- and-end dates. After the total cost of the project has been calculated, a cost and evaluation summary is prepared which includes such things as a cost/benefit analysis, return on investment, etc. 6. Review - all of the preceding elements are then assembled into a
Feasibility Study and a formal review is conducted with all parties involved. The review serves two purposes: to substantiate the thoroughness and accuracy of the Feasibility Study, and to make a project decision; either approve it, reject it, or ask that it be revised before making a final decision. If approved, it is very important that all parties sign the document which expresses their acceptance and commitment to it; it may be a seemingly small gesture, but signatures carry a lot of weight later on as the project progresses. If the Feasibility Study is rejected, the reasons for its rejection should be explained and attached to the document. Conclusion It should be remembered that a Feasibility Study is more of a way of thinking as opposed to a bureaucratic process. For example, what I have just described is essentially the same process we all follow when purchasing an car or a home. As the scope of the project grows, it becomes more important to document the Feasibility Study particularly if large amounts of money are involved and/or the criticality of delivery. Not only should the Feasibility Study contain sufficient detail to carry on to the next succeeding phase in the project, but it should also be used for comparative analysis when preparing the final Project Audit which analyses what was delivered versus what was proposed in the Feasibility Study. Feasibility Studies represent a common sense approach to planning. Frankly, it is just plain good business to conduct them. However, I have read where some people in the IT field, such as the "Agile" methodology proponents, consider Feasibility Studies to be a colossal waste of time. If this is true, I've got a good used car I want to sell them. For your feasibility study about your investment call us on 08032861326.
of a simple flow-through farm. To
calculate with on-growing from 10 gram fry. Before we follow their
calculations, a few financial terms
need to be explained: Variable cost, fixed cost, contribution margin, variable unit cost and break-even point. The variable cost is the cost which
changes with alterations in the
level of production. The fixed cost
is the cost that remains
independent of the level of
production. Examples of fixed cost: house rental, land, depreciation,
cleaning, etc. Examples of variable
cost: feed, medicine, fry and
production labour cost. Some times
it is not obvious whether cost in
question is fixed or variable. Contribution margin is defined as
the sales price minus the variable
cost. Therefore the contribution
margin is the amount which will
pay the fixed cost and give the
profit. In calculation of the cost and in estimation of the grounds for
the business, it is often best to find
the variable cost per unit
produced. That cost is then named
variable unit cost (VUC). The break-
even point is where the sales income is equal to the cost. Such
the break-even point tells the
farmer how much he has to
produce and sell to cover all
variable and fixed cost. The Yield of the Simple Flow-
through Farm The water flow and temperature
throughout the year is known.
kingsway Agro Services can calculate how
much they can produce in a simple
flow-through system at a given
temperature by using the spread sheet file fish to water. On the
sheet called "production" they set
the flow rate 120 L/sec, feed
conversion rate 1,2 (how much
feed is needed to produce 1 kg fish)
and the net sales price 4.18 ECU/kg based on the sale as 40% fresh
fillets and 60% as fresh gutted fish
as mentioned earlier (the price is
based on return price for live fish
as listed in table on previous page).
An estimate of the annual production can be seen in table
below. The average temperature at
their site is around 7°C and their
production circle 35 tons of fish per
year. Let's turn to the table:
Subtracting variable costs such as feed costs, labour production costs
(their own) and fry cost they have
left about 52.000 ECU to pay off the
investment cost and for
maintenance of the farm plus
supporting the family. (The variable unit cost equals 2,7 ECU/kg
or 96.000 ECU total for the 35 tons.) In the table variable cost per kg
(VUC) is shown as constant. As a
matter of fact there will be a
some what higher cost pr. kg
produced at the lowest
temperature as the fish will grow slower but still need some care (it
eats little during winter time so the
feed cost will not be much higher,
but it still needs to be feed and the
farm looked after). Their production at 120 l/sec for a simple flow-through system Temp. Biomass Annual Income VC/kg Contrib./kg Contribution (kg fish) production (kECU) (ECU/kg) (ECU/kg) total (kECU) 4 25.047 32.556 136 2,71 1,47 47,98 5 22.826 34.040 142 2,71 1,47 50,16 6 20.792 34.987 146 2,71 1,47 51,56 7 18.928 35.475 148 2,71 1,47 52,28 8 17.221 35.573 149 2,71 1,47 52,42 9 15.691 35.418 148 2,71 1,47 52,2 10 14.290 34.991 146 2,71 1,47 51,57 11 13.032 34.407 143 2,71 1,47 50,7 12 11.879 33.638 140 2,71 1,47 49,57 Start-up Cost Plan for a Simple
Flow-through System The couple make an estimate of the
investment cost for the simple flow
through system plus the main
operation cost factors for the first
two years. Cost for materials for
harnessing of the water resources are estimated 2.000 ECU. Digging
the ditch for the pipeline from the
source to tanks (750 meters) will
be around 3.600 ECU, work and
gravel included. Expert advice from
engineers is needed to ensure that the pipeline will be correctly
dimensioned and designed. As said
before the pipeline is 750 meters
long and with a height difference
of 15 meters. This equals a height
difference of 20 meters per kilometer and the volume of water
will be 120 l/sec. Using the
nomogram in chapter 3 they find
that a 250 mm pipe is needed. The
15 m height difference equals 1.5
bar pressure and therefore a PN 2.5 pipe is sufficient. The price is
around 14 ECU/meter and the
material cost estimated around
16.000 ECU with bends and other
auxiliary pipes. Around 16 months
will pass from the time they acquire the fry for on growing until
their first harvest. Taking into
account the time it takes to build
the fish farm it can be estimated
that during 2 years period the
couple will work hard in the fish farm without having any income
from it - the cost, however, will not
wait until then, and has to be
financed,by one way or the other. Tank space and price To find out how much tank space is
needed for the 17 tons biomass
needed, it was calculated that 1/27 of the biomass being
small fish, 8/27 average fish and
18/27 big fish. It is also expected that the density is 20 kg/m3 of the smallest fish, 40 kg/m3 of the middle sized fish and 60 kg/m3 of the biggest fish. The total space of
the tanks is calculated as follows: 1/27 x 17tons/20kg/m3=31m3 8/27 x 17 tons/40kg/m3=124m3 18/27 x 17 tons/60kg/m3=186m3 3/11m3 kingsway has made an inventory of
available types and sizes of tanks.
Her findings show that earth ponds
and corrugated steel tanks are the
cheapest choices. The dis advantage
of earth ponds, however, is that they will demand more cleaning
work than tanks, which would be
designed for self-cleaning.
Therefore the couple decides that
corrugated steel tanks would be a
better option. According to the production plan, they need tank space of 340 m3 at maximum production. It is cheaper to buy two big tanks, 170 m3 each, than to buy more and smaller tanks.
However, there are two important
reasons for taking the more
expensive choice: 1. It allows better size grading and
therefore prevent that fast
growing fish takes all the food
from the smaller ones and thus still
increase the difference in size. 2. In case of infection, it can be
confined to one tank. One tank
must be used as starvation tank
before slaughtering. A suitable choice would be two tanks of 15 m3 for the smallest fish, two 60 m3 tanks for middle size and three more 60m3 for the bigger fish.
Feasibility study in fish and pig farming do vary due to:
A.location.
B.cost of laboure.
C.The type of fish and fish feed.
D.The cost of selling the farm product in the area...
Feasibility study is very important before starting a fishfarm.
The Elements of a Good Feasibility
Study By kingsway Agro Services "Those who do not do their home work do not graduate." Bryce's Law In its simplest form, a Feasibility Study represents a definition of a problem or opportunity to be studied, an analysis of the current mode of operation, a definition of requirements, an evaluation of alternatives, and an agreed upon course of action. As such, the activities for preparing a Feasibility Study are generic in nature and can
be applied to any type of project, be it for systems and software development, making an acquisition, or any other project. There are basically six parts to any effective Feasibility Study: 1.
 The Project Scope which is used to define the business problem and/or opportunity to be addressed. The old adage, "The problem well stated is half solved," is very apropos. The scope should be definitive and to the point; rambling narrative serves no purpose and can actually confuse project participants. It is also necessary to define the parts of the business affected either directly or indirectly, including project participants and end-user areas affected by the project. The project sponsor should be identified, particularly if he/she is footing the bill. I have seen too many projects in the corporate world started without a well defined project scope. Consequently, projects have wandered in and out of their boundaries causing them to produce either far too much or far too little than what is truly needed. 2. The Current Analysis is used to define and understand the current method of implementation, such as a system, a product, etc. From this analysis, it is not uncommon to discover there is actually nothing wrong with the current system or product other than some misunderstandings regarding it or perhaps it needs some simple modifications as opposed to a major overhaul. Also, the strengths and weaknesses of the current approach are identified (pros and cons). In addition, there may very well be elements of the current system or product that may be used in its successor thus saving time and money later on. Without such analysis, this may never be discovered. Analysts are cautioned to avoid the temptation to stop and correct any problems encountered in the current system at this time. Simply document your findings instead, otherwise you will spend more time unnecessarily in this stage (aka "Analysis Paralysis"). 3. Requirements -
how requirements are defined depends on the object of the project's attention. For example, how requirements are specified for a product are substantially different than requirements for an edifice, a bridge, or an information system. Each exhibits totally different properties and, as such, are defined
differently. How you define requirements for software is also substantially different than how you define them for systems. 4. The Approach represents the recommended solution or course of action to satisfy the requirements. Here, various alternatives are considered along with an explanation as to why the preferred solution was selected. In terms of design related projects, it is here where whole rough designs (e.g., "renderings") are developed in order to determine viability.
The Elements of a Good Feasibility
Study By kingsway Agro Services "Those who do not do their home work do not graduate." Bryce's Law In its simplest form, a Feasibility Study represents a definition of a problem or opportunity to be studied, an analysis of the current mode of operation, a definition of requirements, an evaluation of alternatives, and an agreed upon course of action. As such, the activities for preparing a Feasibility Study are generic in nature and can
be applied to any type of project, be it for systems and software development, making an acquisition, or any other project. There are basically six parts to any effective Feasibility Study: 1.
 The Project Scope which is used to define the business problem and/or opportunity to be addressed. The old adage, "The problem well stated is half solved," is very apropos. The scope should be definitive and to the point; rambling narrative serves no purpose and can actually confuse project participants. It is also necessary to define the parts of the business affected either directly or indirectly, including project participants and end-user areas affected by the project. The project sponsor should be identified, particularly if he/she is footing the bill. I have seen too many projects in the corporate world started without a well defined project scope. Consequently, projects have wandered in and out of their boundaries causing them to produce either far too much or far too little than what is truly needed. 2. The Current Analysis is used to define and understand the current method of implementation, such as a system, a product, etc. From this analysis, it is not uncommon to discover there is actually nothing wrong with the current system or product other than some misunderstandings regarding it or perhaps it needs some simple modifications as opposed to a major overhaul. Also, the strengths and weaknesses of the current approach are identified (pros and cons). In addition, there may very well be elements of the current system or product that may be used in its successor thus saving time and money later on. Without such analysis, this may never be discovered. Analysts are cautioned to avoid the temptation to stop and correct any problems encountered in the current system at this time. Simply document your findings instead, otherwise you will spend more time unnecessarily in this stage (aka "Analysis Paralysis"). 3. Requirements -
how requirements are defined depends on the object of the project's attention. For example, how requirements are specified for a product are substantially different than requirements for an edifice, a bridge, or an information system. Each exhibits totally different properties and, as such, are defined
differently. How you define requirements for software is also substantially different than how you define them for systems. 4. The Approach represents the recommended solution or course of action to satisfy the requirements. Here, various alternatives are considered along with an explanation as to why the preferred solution was selected. In terms of design related projects, it is here where whole rough designs (e.g., "renderings") are developed in order to determine viability. It is also at this point where the use of existing structures and commercial alternatives are considered (e.g., "build versus buy" decisions). The over riding considerations though are: Does the recommended approach satisfy the requirements? Is it also a practical and viable solution? (Will it "Play in Pough keepsie?") A thorough analysis here is needed in order to perform the next step... 5. Evaluation - examines the cost effectiveness of the approach selected. This begins with an analysis of the estimated total cost of the project. In addition to the recommended solution, other alternatives are estimated in order to offer an economic comparison. For development projects, an estimate of labour and out-of- pocket expenses is assembled along with a project schedule showing the project path and start- and-end dates. After the total cost of the project has been calculated, a cost and evaluation summary is prepared which includes such things as a cost/benefit analysis, return on investment, etc. 6. Review - all of the preceding elements are then assembled into a
Feasibility Study and a formal review is conducted with all parties involved. The review serves two purposes: to substantiate the thoroughness and accuracy of the Feasibility Study, and to make a project decision; either approve it, reject it, or ask that it be revised before making a final decision. If approved, it is very important that all parties sign the document which expresses their acceptance and commitment to it; it may be a seemingly small gesture, but signatures carry a lot of weight later on as the project progresses. If the Feasibility Study is rejected, the reasons for its rejection should be explained and attached to the document. Conclusion It should be remembered that a Feasibility Study is more of a way of thinking as opposed to a bureaucratic process. For example, what I have just described is essentially the same process we all follow when purchasing an car or a home. As the scope of the project grows, it becomes more important to document the Feasibility Study particularly if large amounts of money are involved and/or the criticality of delivery. Not only should the Feasibility Study contain sufficient detail to carry on to the next succeeding phase in the project, but it should also be used for comparative analysis when preparing the final Project Audit which analyses what was delivered versus what was proposed in the Feasibility Study. Feasibility Studies represent a common sense approach to planning. Frankly, it is just plain good business to conduct them. However, I have read where some people in the IT field, such as the "Agile" methodology proponents, consider Feasibility Studies to be a colossal waste of time. If this is true, I've got a good used car I want to sell them. For your feasibility study about your investment call us on 08032861326.

It is also at this point where the use of existing structures and commercial alternatives are considered (e.g., "build versus buy" decisions). The over riding considerations though are: Does the recommended approach satisfy the requirements? Is it also a practical and viable solution? (Will it "Play in Pough keepsie?") A thorough analysis here is needed in order to perform the next step... 5. Evaluation - examines the cost effectiveness of the approach selected. This begins with an analysis of the estimated total cost of the project. In addition to the recommended solution, other alternatives are estimated in order to offer an economic comparison. For development projects, an estimate of labour and out-of- pocket expenses is assembled along with a project schedule showing the project path and start- and-end dates. After the total cost of the project has been calculated, a cost and evaluation summary is prepared which includes such things as a cost/benefit analysis, return on investment, etc. 6. Review - all of the preceding elements are then assembled into a
Feasibility Study and a formal review is conducted with all parties involved. The review serves two purposes: to substantiate the thoroughness and accuracy of the Feasibility Study, and to make a project decision; either approve it, reject it, or ask that it be revised before making a final decision. If approved, it is very important that all parties sign the document which expresses their acceptance and commitment to it; it may be a seemingly small gesture, but signatures carry a lot of weight later on as the project progresses. If the Feasibility Study is rejected, the reasons for its rejection should be explained and attached to the document. Conclusion It should be remembered that a Feasibility Study is more of a way of thinking as opposed to a bureaucratic process. For example, what I have just described is essentially the same process we all follow when purchasing an car or a home. As the scope of the project grows, it becomes more important to document the Feasibility Study particularly if large amounts of money are involved and/or the criticality of delivery. Not only should the Feasibility Study contain sufficient detail to carry on to the next succeeding phase in the project, but it should also be used for comparative analysis when preparing the final Project Audit which analyses what was delivered versus what was proposed in the Feasibility Study. Feasibility Studies represent a common sense approach to planning. Frankly, it is just plain good business to conduct them. However, I have read where some people in the IT field, such as the "Agile" methodology proponents, consider Feasibility Studies to be a colossal waste of time. If this is true, I've got a good used car I want to sell them. For your feasibility study about your investment call us on 08032861326

DUCKWEED AS ALTERNATVE TO MANY FISHFEED INGREDIENTS

Duckweed as a Primary
Feedstock for Aquaculture. A Summary of its Potential
Advantages. Cross Introduction Productivity Nutritional Value Feeding Trials Conclusions References Summary: The technical literature shows that
duckweeds (Lemnaceae) have a
strong potential as primary
feedstocks for production of
livestock and fish. These plants
grow rapidly and are high in protein and dietary minerals and
low in fiber. They do not produce
toxic alkaloids and are palatable to
a wide variety of domestic animals
and fish. Feeding trials show that
they are suitable for animal production, and that the meat is
tasty and nutritious for human
consumption. Growth of
Lemnaceae requires shallow ponds,
but their culture reduces
evaporation from the water surface and decreases growth of
undesirable algae. Duckweeds are
adapted to many climatic zones
around the world, and hence are
widely suitable for primary food
production. Introduction: Duckweeds are the smallest
flowering plants. They grow as
small colonies of plants floating on
the surfaces of quiet bodies of
water. Growing vegetatively, their
multiplication can be extremely rapid, given the proper conditions.
These plants are almost all leaf,
having essentially no stem tissue,
and only one or a few, very fine
roots. In nature, duckweeds serve
as food for many species of fish and aquatic birds. They can
tolerate and grow under a wide
range of conditions, including on
water polluted with high
concentrations of bacteria and
some agricultural wastes. These characteristics have brought the
duckweeds to the attention of
environmental engineers and
agriculturists alike. A delightful, non technical
discussion of duckweeds, has
recently appeared in Pacific Discovery, while an article in Smithsonian (Stewart, 1989) mentions their role in advanced biological sewage
treatment. A thorough technical
discussion of all aspects of their
biology has been published (in
English) by Professor Elias Landolt
of the Swiss Geobotanical Institute (Landolt and Kandeler, 1987). [ top of page ] Productivity of Duckweeds: Culley et al. (1981) and Landolt and Kandeler (1987, pp. 371-373) summarize many earlier studies
demonstrating the unusually high
productivity of this aquatic plant.
Dry weight increases of 10-20 tons/
ha/yr are the norm. Doubling
times in the range of 24 hr have been observed on many occasions,
a rate of increase results in 64 g/g
dry weight/week, or 73 tons/ha/yr
(Landolt and Kandeler, 1987, p. 371). As Landolt and Kandeler point out, the observed values are
therefore about 1/3-2/3 the
theoretical value. Under summer
conditions in Louisiana with heavy
fertilization, up to 44 tons/ha/yr
have been obtained (Said et al. 1979). Needless to say, these rates of
increase will be negatively affected
by diminished rates of fertilization
or cold weather in the temperate
zone. However, it is clear that the
species of this group are capable of a level of productivity closer to
that obtained with micro organisms
than with other higher plants. The high levels of fertility required
to obtain this massive growth of
duckweeds might seem to be an
obstacle, but in fact are
economically feasible, if the use of
nitrogenous runoff wastes from feed lots or other ready sources are
foreseen. [ top of page ] Nutritional Value of Duckweeds: Much reliable analytic data is
available to support the use fulness
of the duckweeds as valuable food
sources (Landolt and Kandeler, 1987). Most species have protein
contents in the range of 15-45%,
depending on the nitrogen supply,
and the amino acid balance is
favorable, with only TRP and MET
generally limiting (Landolt and Kandeler, 1987, pp 375-377. The yearly protein yield/ha is up to
tenfold higher with Lemna than
with soybeans, and nearly as much
better than for alfalfa (Said et al. 1979). Recent work with Lemna
paucicostata in Nigeria (Mibagwu, and Adeniji, 1988) indicates an especially high nutritional value.
Their analyses of plants from thre e
locations in the Kainji lake are a
showed a crude protein ranging
from 26.3-45.5% of dry weight: "The amino acid content compared
favourably with that of blood,
soybean and cottonseed meals
and considerably exceeded that of
groundnut meal. The levels of the
se esential amino acids surpassed the FAO reference pattern, except for
methionine which met 61.4% of the
re commended value. The levels of
minerals were high but should not
pose any toxicity problems if
incorporated into animal feeds. The levels of nitrogen in the plant are
comparable to those in commercial
fertilizers. The plant could be a
good dietary supplement and
nutrient source for humans,
livestock and fish...." "With an average standing crop of 309 kg
dry mass/ha and doubling time of
1.2 d, 129 kg DM/ha of dry
duckweed are obtainable daily in
the Kainji Lake area, which could
ensure a daily supply of 59 kg of high-quality protein for poultry
and fish feed formulation...." [ top of page ] Feeding Trials with Duckweeds: 1. Fish. Duckweeds can be grown
separately and then provided to
the fish, or produced in the same
pond. Production of Lemna in the
same pond is not likely to work
efficiently, however. Vigorous aeration of the water, as is
practiced in catfish-culture, will
disturb the growth of the plant.
The photosynthetic activities of the
plant do not oxygenate the water,
in fact the covering plants reduce gas-exchange with the atmosphere
(Landolt and Kandeler, 1987, p 387). Grass carp seem particularly
adapted to feeding on Lemna, and
there is a large literature devoted
to this application (summarized by Landolt and Kandeler, 1987, pp. 387-388.). As reviewed by Landolt and Kandeler, channel catfish have been successfully raised on
duckweeds, but no commercial
application of these findings seems
to have been developed. The growth of hybrid carp were
studied by Cassani and Caton (1983) to determine feeding
preference and feed consumption.
The hybrid was grass carp,
Ctenopharyngodon idella (Val.) X
bighead carp, Hypophthalmichthys
(Aristichthys) nobilis Rich, 12 to 18 months old. Their conclusion was,
"The most preferred plant was
Lemna gibba when in combination
with six other species." Moreover,
at the same order of preference
was exhibited at two different growth temperatures (12-15 C vs.
25-28 C). This preference was the
same, based either on the time to
complete consumption or the
relative quantity consumed. Mean
daily consumption (g) fish at 25-31 C for Lemna gibba tested
separately was 178. Gaigher, et al. (1984) compared the growth of hybrid tilapia fish
(Oreochromis niloticus X O. aureus)
on commercial pellets vs.
duckweed. The fish were cultured
at high densities in an
experimental recirculating unit for 89 days with duckweed (Lemna
gibba) or a combination of
duckweed and commercial pellets.
They conclude that a combination
of pellets and Lemna gave the best
performance: When fed on duckweed alone,
intake rate was low, feed
conversion ratio good (1:1) and
relative growth rate poor (0.67%
of body weight daily). Sixty-five
percent of the duckweed consumed was assimilated and 26%
converted to fish. When the fish
were fed on pellets in addition to
duckweed the rate of duckweed
consumption decreased and
growth rate of the fish doubled with feed conversion ratios
between 1.2 and 1.8. Seventy
percent of the mixed diet was
assimilated but only 21%
converted. Fish grown on the
mixed diet performed similarly to fish grown on pellets but had a
better feed conversion ratio. Porath, et al. (1985) attempted to recycle the solid wastes of the sea
fish as a fertilizer for Lemna. The
duckweed (Lemna gibba) was
grown in shallow ponds containing
mineral nutrients. However, the
tilapia waste was poor in free NH3 and ammonium compounds. When
separated and incubated at 38 C to
allow anaerobic digestion to
release mineral nutrients,
prolonged digestion was necessary
before it supported growth of the plant. Tilapia were given duckweed as
food as young fish from the larval
to the fingerling stages (Moreau, et al., 1986). A comparison was made of three types of food: Lemna
minor (duckweed, produced in
shallow ponds or year-round in
greenhouses), Chlorella
(phytoplankton) and Daphnia
(zooplankton). These authors studied both the nutritional value
of these foods and the resulting
growth rates of the fish. Crayfish are often released in
irrigated rice fields in rice- growth
are as of the United States to
control weeds (often duckweeds),
according to Landolt and Kandeler. It is not known if the deliberate
growth of Lemnaceae would be an
efficient means of production of
these crustaceans. 2. Warm-blooded animals. Porath, et al. (1985) reported preliminary tests using duckweed
to substitute for animal protein-
rich feed in diets of young lamb s
and Awasi sheep. Landolt and Kandeler (1987) summarize many other studies of this kind. It need
not be stressed that many
water fowl normally feed upon this
plant. Chickens have also been
prime candidates for this food
source, since their high efficiency of feed conversion would further
contribute to its economic viability.
Work with laying hens has been
particularly encouraging (Haustein et al., 1990). [ top of page ] Conclusions: Numerous demonstration projects
prove the usefulness of duckweeds
as the primary food source for
production of fish and livestock.
These studies show that duckweeds
are highly productive and economical to grow, and that the
plants provide nutritious and
palatable food for meat animals.
Based on this farming system, and with no additional basic
research, highly profitable agricultural ventures can be
developed.

FINGERLINGS PRODUCTION

Catfishes of the family Claridae
comprise the most commonly
cultivated fishes in Nigeria. The
growth of aquaculture in Nigeria
now is largely being boosted by a
steady rise in catfish culture. Since the culture of Clarias gariepinus
through hypophysation was
initiated in Western Nigeria in
1973, the procedure has been
widely practiced through out
Nigeria thus leading to increase of farm-raised catfishes from the
80’s to date. The favoured catfish
species in Nigeria aquaculture
include: Clarias gariepinus,
Heterobranchus bidorsalis, Clarias X
Heterobranchus hybrid (Heteroclarias) and Clarias
nigrodigitatus. Heterobranchus sp
p the more commonly cultured fish
in the South Eastern parts of
Nigeria. LARVAL PRODUCTION :Despite the popularity of the African catfish
and its great market potentials, the
production is still basically at
subsistence level due majorly to
inadequate availability of seed for
stocking and feed problems. In Europe, about 75% of Clarias
fingerling demands are supplied by
a few producers. In Nigeria
however, the fingerlings supplied
from both the government and
privately owned hatcheries are not enough to meet the catfish
farmers’ fingerling demands. Artificial propagation of C.
gariepinus is now carried out in
hatcheries with hormonal
induction. Farmers have found the
homoplastic pituitary gland
suspension cheaper, practical and more highly reliable than the
imported synthetic hormonal
analogues. The C. gariepinus
broodstock weight used for
artificial breeding ranges between
0.5 and 2kg (kingsway 2000). Despite the break through with use
of hormone in induced spawning;
fry survival is still be set with a
number of biotic and abiotic
factors. The biotic factors include
cannibalism, heavy predation by frogs/aquatic insects and the
abiotic factors include water
temperature, dissolved oxygen
(>4.5mg/L-1), levels of ammonia.
During the first week after
stocking, the most critical factor for the successful nursing of the catfish
larvae is the availability of
zooplankton. Feeds and feeding of
the larvae, fry and fingerlings of
the catfishes have been most
studied and shown to influence the growth and survival of the fish.
Studies have revealed that live
zooplankton is the preferred larval
food. Many small holdings merely
rear larvae to fingerling size in
organically fertilized ponds at a density of between 30-1000 larvae/
m2 . Fingerlings are stocked into
rearing ponds at a rate of 50-75
fish/m3 under good management. THE CULTURE SYSTEM : Because of the cannibalistic nature of Clarias
gariepinus, multiple sorting is
essential. For outdoor fry/
fingerlings rearing, screening of
the tanks with mosquito nets is
recommended to prevent dragonfly and other predatory
insects from breeding in the ponds.
Poly-culture of Clarias gariepinus
and Tilapia species is practiced. A
poly-culture of Clarias gariepinus
and Oreochromis niloticus, integrated with poultry with some
supplementary feeding had been
shown to be viable. FEED AND FEEDING: Feed and feeding of catfishes in grow outs
ponds are perhaps the most
documented in literature. Various
efforts have been made to
establish the crude protein and
amino acid requirement of C. gariepinus. (kingsway)
recommended 35% and 40% crude
protein (Cp) for raising table size
and brood stock respectively. Of
the 10 essential amino acids (EAA)
required by warm water fish species, only 3 EAAs studied have
been documented and these are
arginnie, methionine and lysine. In
order to formulate and compound
aqua feeds that will meet the
nutrient requirements of the catfish at affordable cost, several
conventional and non-conventional
animal by-products and plant
residues have been tested to
substitute or replace fishmeal
. Feeding development has moved from the use of single
ingredient, broadcasting un-
pelleted meal to pelleting and in
fact the use of pelleted floating
feed which has made a big
difference to aquaculture development in Nigeria as C.
gariepinus is being raised to
maturity within 6 months. HYBRIDIZATION OF Clarias gariepinus x Heterobranchus longifilis :The yearnings of farmers and scientists to have a
farmed catfish that combines the
fast growth traits of
Heterobranchus spp and early
maturing traits of C. gariepinus led
to the development of a hybrid ‘Heteroclarias’ spp. The
technology was widely accepted a s
it gave 58% internal rate of return
(IRR) on investment. CULTURE SYSTEM MODIFICATION :In the review of Oresegun et al (2007), it was stated
that early fish farmers in Nigeria
raised their fish in burrow pits,
abandoned minefields and in
earthen ponds on extensive
production system. The introduction of concrete tanks
allows for manageable pond size
and modification of the
environment through a water
flow-through system and
supplementary feeding thus allowing for higher fish yield. The
advent of the indoor water re-
circulatory system (WRS) has
ushered in a new prospect for
aquaculture. The introduction of
WRS has created a turning point in the production of catfish in
Nigeria. PROSPECTS AND PROBLEMS OF CULTURE: The story of aquaculture in Nigeria is essentially the story of
catfish culture and the hope of fish
supply in Nigeria hangs on its
development and culture. Recent
trends all over the world, point to
a decline in landing from capture fisheries, an indicator that fish
stocks have approached or even
exceeded the point of maximum
sustainable yield. Aquaculture
therefore remains the only viable
alternative for increasing fish production in order to meet the
protein need of the people. It was
observed that of the over 30,000MT
of various freshwater and brackish
water fish species caught in the
year 2000, catfishes were more abundant next to Tilapines . FAO (1993) reported that
27,488MT of catfishes produced in
1990 were consumed locally. This
implies that there is still great need
for higher production for both local and international markets. Interested in fish farming
manual, and start your fish
farming business today, if yes is
your answer, why not place an
order now by following the
ordering instruction below. call us on 08032861326,'for your best breeds of fingerlings and other services.

FINGERLINGS PRODUCTION

Catfishes of the family Claridae
comprise the most commonly
cultivated fishes in Nigeria. The
growth of aquaculture in Nigeria
now is largely being boosted by a
steady rise in catfish culture. Since the culture of Clarias gariepinus
through hypophysation was
initiated in Western Nigeria in
1973, the procedure has been
widely practiced through out
Nigeria thus leading to increase of farm-raised catfishes from the
80’s to date. The favoured catfish
species in Nigeria aquaculture
include: Clarias gariepinus,
Heterobranchus bidorsalis, Clarias X
Heterobranchus hybrid (Heteroclarias) and Clarias
nigrodigitatus. Heterobranchus sp
p the more commonly cultured fish
in the South Eastern parts of
Nigeria. LARVAL PRODUCTION :Despite the popularity of the African catfish
and its great market potentials, the
production is still basically at
subsistence level due majorly to
inadequate availability of seed for
stocking and feed problems. In Europe, about 75% of Clarias
fingerling demands are supplied by
a few producers. In Nigeria
however, the fingerlings supplied
from both the government and
privately owned hatcheries are not enough to meet the catfish
farmers’ fingerling demands. Artificial propagation of C.
gariepinus is now carried out in
hatcheries with hormonal
induction. Farmers have found the
homoplastic pituitary gland
suspension cheaper, practical and more highly reliable than the
imported synthetic hormonal
analogues. The C. gariepinus
broodstock weight used for
artificial breeding ranges between
0.5 and 2kg (kingsway 2000). Despite the break through with use
of hormone in induced spawning;
fry survival is still be set with a
number of biotic and abiotic
factors. The biotic factors include
cannibalism, heavy predation by frogs/aquatic insects and the
abiotic factors include water
temperature, dissolved oxygen
(>4.5mg/L-1), levels of ammonia.
During the first week after
stocking, the most critical factor for the successful nursing of the catfish
larvae is the availability of
zooplankton. Feeds and feeding of
the larvae, fry and fingerlings of
the catfishes have been most
studied and shown to influence the growth and survival of the fish.
Studies have revealed that live
zooplankton is the preferred larval
food. Many small holdings merely
rear larvae to fingerling size in
organically fertilized ponds at a density of between 30-1000 larvae/
m2 . Fingerlings are stocked into
rearing ponds at a rate of 50-75
fish/m3 under good management. THE CULTURE SYSTEM : Because of the cannibalistic nature of Clarias
gariepinus, multiple sorting is
essential. For outdoor fry/
fingerlings rearing, screening of
the tanks with mosquito nets is
recommended to prevent dragonfly and other predatory
insects from breeding in the ponds.
Poly-culture of Clarias gariepinus
and Tilapia species is practiced. A
poly-culture of Clarias gariepinus
and Oreochromis niloticus, integrated with poultry with some
supplementary feeding had been
shown to be viable. FEED AND FEEDING: Feed and feeding of catfishes in grow outs
ponds are perhaps the most
documented in literature. Various
efforts have been made to
establish the crude protein and
amino acid requirement of C. gariepinus. (kingsway)
recommended 35% and 40% crude
protein (Cp) for raising table size
and brood stock respectively. Of
the 10 essential amino acids (EAA)
required by warm water fish species, only 3 EAAs studied have
been documented and these are
arginnie, methionine and lysine. In
order to formulate and compound
aqua feeds that will meet the
nutrient requirements of the catfish at affordable cost, several
conventional and non-conventional
animal by-products and plant
residues have been tested to
substitute or replace fishmeal
. Feeding development has moved from the use of single
ingredient, broadcasting un-
pelleted meal to pelleting and in
fact the use of pelleted floating
feed which has made a big
difference to aquaculture development in Nigeria as C.
gariepinus is being raised to
maturity within 6 months. HYBRIDIZATION OF Clarias gariepinus x Heterobranchus longifilis :The yearnings of farmers and scientists to have a
farmed catfish that combines the
fast growth traits of
Heterobranchus spp and early
maturing traits of C. gariepinus led
to the development of a hybrid ‘Heteroclarias’ spp. The
technology was widely accepted a s
it gave 58% internal rate of return
(IRR) on investment. CULTURE SYSTEM MODIFICATION :In the review of Oresegun et al (2007), it was stated
that early fish farmers in Nigeria
raised their fish in burrow pits,
abandoned minefields and in
earthen ponds on extensive
production system. The introduction of concrete tanks
allows for manageable pond size
and modification of the
environment through a water
flow-through system and
supplementary feeding thus allowing for higher fish yield. The
advent of the indoor water re-
circulatory system (WRS) has
ushered in a new prospect for
aquaculture. The introduction of
WRS has created a turning point in the production of catfish in
Nigeria. PROSPECTS AND PROBLEMS OF CULTURE: The story of aquaculture in Nigeria is essentially the story of
catfish culture and the hope of fish
supply in Nigeria hangs on its
development and culture. Recent
trends all over the world, point to
a decline in landing from capture fisheries, an indicator that fish
stocks have approached or even
exceeded the point of maximum
sustainable yield. Aquaculture
therefore remains the only viable
alternative for increasing fish production in order to meet the
protein need of the people. It was
observed that of the over 30,000MT
of various freshwater and brackish
water fish species caught in the
year 2000, catfishes were more abundant next to Tilapines . FAO (1993) reported that
27,488MT of catfishes produced in
1990 were consumed locally. This
implies that there is still great need
for higher production for both local and international markets. Interested in fish farming
manual, and start your fish
farming business today, if yes is
your answer, why not place an
order now by following the
ordering instruction below. call us on 08032861326,'for your best breeds of fingerlings and other services.

BEST BREEDS FOR YOUR CATFISH FINGERLINGS.

Catfishes of the family Claridae
comprise the most commonly
cultivated fishes in Nigeria. The
growth of aquaculture in Nigeria
now is largely being boosted by a
steady rise in catfish culture. Since the culture of Clarias gariepinus
through hypophysation was
initiated in Western Nigeria in
1973, the procedure has been
widely practiced through out
Nigeria thus leading to increase of farm-raised catfishes from the
80’s to date. The favoured catfish
species in Nigeria aquaculture
include: Clarias gariepinus,
Heterobranchus bidorsalis, Clarias X
Heterobranchus hybrid (Heteroclarias) and Clarias
nigrodigitatus. Heterobranchus sp
p the more commonly cultured fish
in the South Eastern parts of
Nigeria. LARVAL PRODUCTION :Despite the popularity of the African catfish
and its great market potentials, the
production is still basically at
subsistence level due majorly to
inadequate availability of seed for
stocking and feed problems. In Europe, about 75% of Clarias
fingerling demands are supplied by
a few producers. In Nigeria
however, the fingerlings supplied
from both the government and
privately owned hatcheries are not enough to meet the catfish
farmers’ fingerling demands. Artificial propagation of C.
gariepinus is now carried out in
hatcheries with hormonal
induction. Farmers have found the
homoplastic pituitary gland
suspension cheaper, practical and more highly reliable than the
imported synthetic hormonal
analogues. The C. gariepinus
broodstock weight used for
artificial breeding ranges between
0.5 and 2kg (kingsway 2000). Despite the break through with use
of hormone in induced spawning;
fry survival is still be set with a
number of biotic and abiotic
factors. The biotic factors include
cannibalism, heavy predation by frogs/aquatic insects and the
abiotic factors include water
temperature, dissolved oxygen
(>4.5mg/L-1), levels of ammonia.
During the first week after
stocking, the most critical factor for the successful nursing of the catfish
larvae is the availability of
zooplankton. Feeds and feeding of
the larvae, fry and fingerlings of
the catfishes have been most
studied and shown to influence the growth and survival of the fish.
Studies have revealed that live
zooplankton is the preferred larval
food. Many small holdings merely
rear larvae to fingerling size in
organically fertilized ponds at a density of between 30-1000 larvae/
m2 . Fingerlings are stocked into
rearing ponds at a rate of 50-75
fish/m3 under good management. THE CULTURE SYSTEM : Because of the cannibalistic nature of Clarias
gariepinus, multiple sorting is
essential. For outdoor fry/
fingerlings rearing, screening of
the tanks with mosquito nets is
recommended to prevent dragonfly and other predatory
insects from breeding in the ponds.
Poly-culture of Clarias gariepinus
and Tilapia species is practiced. A
poly-culture of Clarias gariepinus
and Oreochromis niloticus, integrated with poultry with some
supplementary feeding had been
shown to be viable. FEED AND FEEDING: Feed and feeding of catfishes in grow outs
ponds are perhaps the most
documented in literature. Various
efforts have been made to
establish the crude protein and
amino acid requirement of C. gariepinus. (kingsway)
recommended 35% and 40% crude
protein (Cp) for raising table size
and brood stock respectively. Of
the 10 essential amino acids (EAA)
required by warm water fish species, only 3 EAAs studied have
been documented and these are
arginnie, methionine and lysine. In
order to formulate and compound
aqua feeds that will meet the
nutrient requirements of the catfish at affordable cost, several
conventional and non-conventional
animal by-products and plant
residues have been tested to
substitute or replace fishmeal
. Feeding development has moved from the use of single
ingredient, broadcasting un-
pelleted meal to pelleting and in
fact the use of pelleted floating
feed which has made a big
difference to aquaculture development in Nigeria as C.
gariepinus is being raised to
maturity within 6 months. HYBRIDIZATION OF Clarias gariepinus x Heterobranchus longifilis :The yearnings of farmers and scientists to have a
farmed catfish that combines the
fast growth traits of
Heterobranchus spp and early
maturing traits of C. gariepinus led
to the development of a hybrid ‘Heteroclarias’ spp. The
technology was widely accepted a s
it gave 58% internal rate of return
(IRR) on investment. CULTURE SYSTEM MODIFICATION :In the review of Oresegun et al (2007), it was stated
that early fish farmers in Nigeria
raised their fish in burrow pits,
abandoned minefields and in
earthen ponds on extensive
production system. The introduction of concrete tanks
allows for manageable pond size
and modification of the
environment through a water
flow-through system and
supplementary feeding thus allowing for higher fish yield. The
advent of the indoor water re-
circulatory system (WRS) has
ushered in a new prospect for
aquaculture. The introduction of
WRS has created a turning point in the production of catfish in
Nigeria. PROSPECTS AND PROBLEMS OF CULTURE: The story of aquaculture in Nigeria is essentially the story of
catfish culture and the hope of fish
supply in Nigeria hangs on its
development and culture. Recent
trends all over the world, point to
a decline in landing from capture fisheries, an indicator that fish
stocks have approached or even
exceeded the point of maximum
sustainable yield. Aquaculture
therefore remains the only viable
alternative for increasing fish production in order to meet the
protein need of the people. It was
observed that of the over 30,000MT
of various freshwater and brackish
water fish species caught in the
year 2000, catfishes were more abundant next to Tilapines . FAO (1993) reported that
27,488MT of catfishes produced in
1990 were consumed locally. This
implies that there is still great need
for higher production for both local and international markets. Interested in fish farming
manual, and start your fish
farming business today, if yes is
your answer, why not place an
order now by following the
ordering instruction below. call us on 08032861326,'for your best breeds of fingerlings and other services.

EVALUATION OF THE NUTRIENT COMPOSITION OF SOME UNCONVENTIONAL FEEDSTUFFS

A trial was carried out to evaluate
the nutrient composition of some
unconventional feedstuffs to
ascertain their suitability for
incorporation into fish feed.
Pawpaw seed, mudskipper meal, water melon seed, almond kernel
and groundnut husk were
processed and analyzed for their
proximate and mineral
composition using international y
est ablished procedure. The results obtained showed that the
experimental feed stuffs had
percentage crude protein that
ranged from 7.38% to 55.85%.
The highest level (55.85%) was
found in mudskipper meal while the lowest (7.38%) was found in
groundnut husk. The
experimental feed stuffs had
appreciable levels of calcium,
potassium and phosphorus
ranging from 0.29% to 1.87%, 0.17 to 1.26 and 0.06 to 0.97
respectively. Almond kernel can
be used to replace soybean meal
in aqua feed. Also, mudskipper
meal can be used to replace fish
meal in order to produce a cheaper fish feed; but it was
recommended that feeding trials
should be conducted to ascertain
the inclusion level at which they
can be effectively incorporated.
The potentials of some of these feedstuffs in fish feed formulation
seem high. KEYWORDS: Unconventional
feedstuffs, proximate
composition, mineral
composition, fish feed, nutrient
composition. By kingsway research 2011.

Planning a Fish Farm -a Feasibility Study

Following is an example of the planning of a fish farm. The preparations start with an assessment of the natural
conditions and other things that
may support the venture, a look at the market situation of product in mind, and then if those initial data are found promising, a feasibility study is carried out. It should be mentioned here that during the planning process a constant evaluation of ideas and a revision of goals and methods in
accordance with new information
and changing circumstances are
necessary if the plan is to be a
useful tool to forecast the results of your business operations. If you
have to face the fact that your
original business idea does not
stand scrutiny it's better to
discover that in the planning phase than at a point when an investment is being sacrificed.
THIS FEATURES ARE VERY IMPORTANT
1. The breed you cultured.
2. The way the pond was constructed.
3.The way the feed was formulated and how cheap and the quality in the feed formulated.
4.The marketing and packeging
5.The way growth rate was manipulated(controlled).
6.The water quality controled and management.
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RELATED LINKS

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how to own a mega fish farm business in nigeria 
feasibility report or study on fish farming
LOCAL FISH PROCESSING, SPOILAGE AND PRESERVATION

A PREPARED FEASIBILITY STUDY FOR POND OF 2000 CAPACITY FINGERLINGS

FEED FORMULATION AND PROCESSING

Although the methods of feed formulation vary from one
region to another, however it involves the combination
and blending together of feed ingredients (based on a
formular) into nutritionally balanced and economically
sound diet that can be used in required amount to provide
the level of production desired in fish cultivation. The
processing methods which includes sourcing, mixing,
pelleting, drying and storing is very crucial as it determines
bioavailability of nutrients, feed acceptability, palatability
and durability which often have profound effect on
performance of fish. Therefore there is the need to formulate
a diet at the least possible cost so as to maximize
profit. This can be done by careful selection of ingredients
that are cheap but rich in nutrients for fish growth
and optimum performance. Effective substitution of one
ingredient for another can best be done when knowledge
of the nutrient availability of the substitute is ascertained.
In Africa, protein sources of feed stuffs are usually more
expensive than other ingredients. Protein requirement for
varying species of fish differ. Thus, the protein needs of
the culturable fish specie must be known for effective
feed formulation to be achieved.
Sourcing of ingredients
It involves the purchase of high quality ingredients at very
cheap prices, since the quality of the ingredients invariably
determines the quality of the abundance and cost of
the ingredients. Feed producers must take advantage of
the availability of different feedstuff at very cheap prices
at various times of the year, most especially during harvest
times when the ingredients are available at low
prices.

Fish feed development

Fish feed technology is one of the least developed
sectors of aquaculture particularly in Africa and other
developing countries of the world (FAO, 2003). Feed is
one of the major inputs in aquaculture production. It is
one of the fundamental challenges facing the development
and growth of aquaculture in the African continent.
Fish feed development in Sub-Saharan Africa has not
made a significant progress in aquaculture as expected.
According to Hecht (2000), it is observed that the research
on inexpensive feed ingredients has not contributed
greatly to aquaculture development in Africa and suggested
that more research on how best plant protein can
be used as fish feed is required. Development and management
of fish feed, play very vital role in aquaculture
growth and expansion. Infact, it is a major factor that
determines the profitability of aquaculture venture. Jamu
and Ayinla (2003) reported that feed accounts for at least
60% of the total cost of fish production in Africa, which to
a large extent determines the viability and profitability of
fish farming enterprise. As aquaculture becomes intensive,
most farmers in Africa depend largely on importedB Madagascar, Ghana and Cote D’ivoire, where little
quantity of fish feeds are produced locally, the quality is

Aquaculture and food security

Nutritionally, fish is one of the cheapest and direct sources
of protein and micro nutrient for millions of people in
Africa (Bene and Heck, 2005). With steady decline in
capture fisheries, aquaculture is a readily, veritable tool in
the provision of fish eaten all over the continent. Unlike
some other animal products, fish is widely acceptable. Its
acceptability cut across social, cultural and religious backgrounds.
The United Nations predicted a population of
1188 million in Africa (medium variation) by 2010 (Muir et
al., 2005). To maintain food fish consumption at the present
level of 5 to 45 kg per person per year depending on
the country, (Table 3 and 4) supplies of fish must increase
tremendously.
However, with the current supply trends combined with
ever increasing population, the per capita consumption of
fish in Africa is stagnating and in Sub-Saharan Africa has
fallen drastically (Muir et al., 2005). To arrest this deployrable
condition and boost production of fish aquaculture
remains the only feasible option that can sustain adequate
fish supply in Africa.

AQUACULTURE DEVELOPMENT IN AFRICA

Aquaculture development in Africa is insignificant compared
to the rest of the world (Changadeya et al., 2003).
According to Hetcht (2000) the entire continent contributed
only 0.4% to the total world aquaculture production
for the period 1994 to 1995. In the year 2000 it contributed
a mere 0.97% of the total global aquaculture (FAO,
2003, Table 1).
Although the history of aquaculture is relatively recent
in Sub-Saharan Africa compared to Asia, and some other
parts of the world most known aquaculture systems have
been introduced over the last 35 years (FAO, 1996a;
1996b). The growth, expansion and production of aquaculture
in northern part of Africa especially, Egypt is more
advanced in techniques and technicalities in comparison
to the Sub Saharan regions (Table 2).
In Sub-Saharan regions aquaculture in most places is
still essentially a rural, secondary and part-time activity
taking place in small farms with small fresh water ponds
(FAO 1996a). The systems that are generally practiced
range from extensive to semi-intensive cultural systems
with limited fish yield, which are mostly consumed directly
or sold locally (CIFA 1998). Almost all fish farming is carried
out by rural small scale operators in small fresh water
ponds as a secondary activity to agriculture. Although
there is abundant potential for the development and expansion
of aquaculture in this region, factors such as the

Locally produced fish feed: potentials for aquaculture development in subsaharan Africa


Aquaculture development and growth in Africa have been on low ebb despite the vast aquatic resources
that abounds on the continent. Since the introduction of aquaculture to Africa, some decades ago, there
have been a lot of innovations, technological advancement and progress in the areas of genetics, seed
propagation, pond construction and farm management in general. Despite breakthroughs recorded in
these areas most farmers in Africa still rely heavily on imported feed ingredients and fish feeds from
European countries, which makes fish farming expensive as fish feed account for at least 60% of the
total cost of production. This has contributed in no small measure to the slow pace at which aquaculture
is advancing in Africa. This article, however reviewed critically the potentials of locally manufactured
fish feed in enhancing, improving and sustaining aquaculture development in Africa. Various
methods of processing employed were discussed and suggestions were made on how aquaculture

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