Cage fish farming

Fish cage farming is practiced all over the world. By keeping fish in cages, entire communities can share a body of water while each farmer can tend to their own individual fish farm. Fish cage farming is attractive to many individuals because a large crop can be raised, tended and harvested in a small area.

In Tanzania, the floating cage aquaculture has helped Iringa fish farmers increase their income since they adopted the technology to cope with environmental changes and reducing over dependence on forests

Kilolo District, Iringa Region has over ten cages which are used in ponds to breed fish and the pond which measures 2.5 square metres are used to breed  over 600 fish which take between five and six months before harvesting.

Construction of the cage

Flexible cages are made by building a frame then covering it with netting made from nylon or a similar material.

Selection

Most species of fish can be raised in fish cages. Some species do better than others and some strains within a species will do better

Stocking

Fish should be stocked at a density of five to eight fish per cubic foot of cage volume

Placement

All species must have some water movement; otherwise waste will build up under the cage.

Feeding

Commercial fish feed contains the balance of proteins, amino acids, vitamins and minerals the fish need to grow and stay healthy.

Challenges with cage fish farming

  • In adequate equipments to use while fishing
  • Inadequate time for periodically check the sides of the cages
  • Lack of technical knowledge for the production of fish
  • Aquatic pollution through discharge of agricultural pesticides and domestic wastes

 

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Cage Fish farming

Cage fish farming is a process whereby a cage is placed in a lake or a pond which enables the feeding of the fish in a controlled area.

Construction of cages
Cages for fish cage farming are made from either a hard plastic mesh or wire webbing. flexible cages are made by building a frame, then covering it with netting made from nylon or a similar material. The type of frame used depends upon where it will be placed. Flexible cages are only suitable for still waters where there is little threat from predators, such as turtles or large carnivorous fish.

The types of fish that can be kept in ponds and cages include the following:

  • North African Catfish
  • Nile tilapia
  • Carp

Placement of a cage
Species that require highly oxygenated water, such as trout or salmon, can only be raised in moving water such as rivers.

Stocking in a cage
Fish should be stocked at a density of five to eight fish per cubic foot of cage volume because lower densities encourage aggressive behavior.

Feeding the fish
Caged fish’s nutrition comes from fish food. Commercial fish feed contains the balance of proteins, amino acids, vitamins and minerals the fish need to grow and stay healthy.

Harvesting fish in a cage
Fish may be removed with a hand-held net and if the cage is large, nets may be used to move the fish toward one corner,

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