Tilapia is one of the most common commercial fish, which is grown in special square cages and fed manually several times a day. Experts of the Brazilian company Fisher piscicultura aquaculture have developed a new technology, which differs from the previous one by much lower costs and mortality of fish.
The new fish farm consists of several round cages with wire mesh walls in an aluminum frame 4.5 m high and 12 m in diameter. The tanks are immersed in a pond, while the upper part of them in the form of a ring of PET plastic remains on the surface.
In the center of the tank there is a bunker, where 1200 kg of feed is placed, and which is equipped with a timer connected to the solar battery. The feed is automatically fed to the garden 48 times a day. Such frequent feeding provides the fish with a feeling of constant satiety, and it consumes less food than longer breaks. This mode allows you to save money on food, reduces the amount of excrement and improves digestion.
Earlier, when the fish was gaining the right size and weight, it was transplanted into another tank, making room for the young. This process was very painful for the fish, as a result of which part of it died.
Now, in accordance with the new technology, fish before transplantation should not be caught from the cage – it moves to a new cage, without leaving water. This is achieved by means of a wedge-shaped mesh container, which is inserted into the cage, after which the fish are pounded by means of a rotary valve. At the last stage the mesh container simply moves to another tank.