The quality of the water shrimp farms throw is one of the producers' concern. (Photo: inpi.gov.br/Stock File)
Innovative system to treat shrimp nursery water
Thursday, August 09, 2012, 03:10 (GMT + 9)
A researcher at the Federal University of Ceará (UFC) devised a method for improving the treatment of the water used in shrimp nurseries.
With the novel method it is even likely to reuse the water for breeding the crustacean, its inventor, biologist Francisco José Araújo, states.
In the town of Aracati, on the coast of Ceará, shrimp farms are located along the river Jaguaribe, where producers throw the water used in nurseries, reports Globo.
In this area, which is one of the regions of Brazil with the highest farmed shrimp production, a major concern farmers have is the water that returns to the river bed. Current rules state that this water should have at least the same quality as that when it was collected.
The method developed by Araújo consists of two filters in which the bacteria feed on the organic matter the shrimp leaves in the water.
After the treatment, the water that was dark becomes transparent.
The first filter is anaerobic, that is to say, it works with oxygen restriction. The second filter is aerobic, meaning that air is injected into the biological filter, the researcher of UFC explains.
Araújo stressed that the system is totally biological and does not use any chemical treatment.
"It facilitates the recirculation of the water in the farm without affecting productivity," the Brazilian biologist pointed out.
The results of this research will be presented in September at the University Headquarters.
By Analia Murias