New efficient fish farm developed in Brazil

Tilapia is one of the most common commercial fish that is raised in special square cages and fed by hand several times a day. Specialists of the Brazilian company Fisher piscicultura aquaculture have developed a new technology that differs from the previous one in much lower costs and fish mortality.

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 cages are immersed in the reservoir, while the upper part of them in the form of a ring made of PET plastic remains on the surface.

In the center of the cage there is a hopper that holds 1200 kg of feed and is equipped with a timer connected to a solar panel. Feed is automatically fed into the cage 48 times a day. Feeding this often keeps the fish feeling full and consuming less food compared to longer breaks. This regime makes it possible to save money on food, reduces the amount of excrement and improves digestion.

Previously, when the fish gained the desired size and weight, they were transferred to another cage, making room for the fry. This process was very painful for the fish, as a result of which some of it died.

Now, in accordance with the new technology, the fish does not need to be caught from the cage before transferring - it moves to the new cage without leaving the water. This is achieved by means of a wedge-shaped mesh container that is inserted into the cage, after which the fish is driven there using a rotary valve. In the last step, the mesh container is simply moved to another cage.