Intergrated Aqua-Farming | Aquaculture | Carbon Credits | Construction | Alternative Energy

Aquaculture Production

  • STAGE 1: HATCHERY & BREEDING CENTRE

    Where the fish eggs are cultivated leading to the growth of fingerlings. Once the fingerlings are large enough, they move into the fish farm where they are grown out and then later harvested.

     

     The hatchery itself can be a stand-alone project, generating its own returns. A typical hatchery could breed enough fingerlings to supply many fish farms and frequently the state would have their own state hatchery supplying  fingerlings throughout a region. Fingerlings from the hatchery could also be used to populate Lake Malawi for example.

  • STAGE 2: GROW OUT FACILITY

    This would either be attached to the hatchery or could be in a separate location – this facility is where the fingerlings are grown out. A grow out facility consists of numerous large tanks and as the fingerlings grow in size, they are moved from one tank to another.

     

    In a typical scenario, a hatchery would supply numerous grow out facilities. Each grow out facility, on its own can also be a stand-alone project

 

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One of the largest problems with freshwater farms is that it can use a million gallons of water per acre each year. An alternative to outdoor open cage aquaculture is through the use of a recirculation aquaculture system (RAS). A RAS is a series of culture tanks and filters where water is continuously recycled and monitored to keep optimal conditions year round. Extended water
purification systems allow for the reuse (recycling) of local water. Large plastic fish tanks are placed in a greenhouse or contained warehouse. To prevent the deterioration of water quality, the water is treated mechanically through the removal of particulate matter and biologically through the conversion of harmful accumulated chemicals into nontoxic ones.

 

One of the drawbacks to recirculation aquaculture systems is water exchange. However, the rate of water exchange can be reduced through aquaponics, such as the incorporation of hydroponically grown plants. Both methods reduce the amount of nitrate in the water, and can potentially eliminate the need for water exchanges, closing the aquaculture system from the environment. The amount of interaction between the aquaculture system and the environment can be measured through the cumulative feed burden which measures the amount of feed that goes into the RAS relative to the amount of water and waste discharged.

Fish cages are placed in lakes, ponds, rivers or oceans to contain and protect fish until they can be harvested. Fish are stocked in cages, artificially fed, and harvested when they reach market size. A few advantages of fish farming with cages are that many types of waters can be used (rivers, lakes, filled quarries, etc.), many types of fish can be raised, and fish farming can co-exist with sport fishing and other water uses.

 

These use irrigation ditches or farm ponds to raise fish. The basic requirement is to have a ditch or pond that retains water, possibly with an aboveground irrigation system. Using this method, one can store one's water allotment in ponds or ditches, usually lined with clay. In small systems the fish are often fed commercial fish food, and their waste products can help fertilize the fields. In larger ponds, the pond grows water plants and algae as fish food.

 

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