Hundreds of small tilapia farmers are illegal, informal and unregistered which makes it very difficult to control this sector. Therefore, it is impossible to make a reliable estimation of total surface area involved. Intensive pond farming is still an important farming method for farmers of tilapia. The bigger vertically integrated tilapia farmers use intensive cage farming, like GeneSeas and Netuno. As there are several reservoirs throughout Brazil, this kind of farming is increasing rapidly. Some bigger companies are implementing ASC certification which will secure and guarantee the water and environmental management. Companies like GeneSeas and Neptuno International already have their own ASC certified farms.