It doesn't matter if it doesn't exceed the self-purification capacity of fish ponds, but if it is discharged too much or contains drugs and toxins, it will pollute the water body and may lead to fish suffocation or infection and death.

In the process of tilapia breeding, farmers need to make all-round preparations for early breeding in order to successfully complete the related operations of stocking tilapia. First, the water in the fish pond should be drained, then the water with a depth of about 10 cm should be drained into the pond, and then quicklime specially used for disinfection should be put into the pond to completely remove the toxic substances stored in the fish pond and optimize the whole stocking environment. If necessary, put a proper amount of chicken manure and fertilizer water (preferably 500 kg hm-2) into the fish pond to maintain the overall environment of the fish pond relatively stable. After the farmers put chicken manure into the fish pond, they will complete the subsequent water injection operation in the fish pond every 7 days. After the water injection in the fish pond is completely completed, the existing pond water environment should be thoroughly cleaned to improve the productivity of fish.

Pollution-free tilapia culture area requires beautiful environment, fresh air, good soil and water conditions and abundant sunshine. At the same time, we should pay special attention to the surrounding pollution and put an end to all kinds of pollutants around the pond. The best fish pond for tilapia culture is an east-west rectangular fish pond, and the depth of the pond should be controlled within 2 m, and then special drainage facilities should be placed inside the fish pond for tilapia culture.