Agricultural practice: How to Eliminate vegetables floating tanks

Herbivorous fish help in excessive proliferation of plant
by John Mathias


(Photo: Edu Castello / Editora Globo)

How is it possible to eliminate the pool of fish farm of my uncle forming a green layer, re-cover the water even after being removed?

Talita Regina
Cerro Azul, PR

On the surface of rearing tanks can occur in the presence floating plant species. The excessive proliferation of the plant, however, is caused by the accumulation of organic matter (sludge), which serves as a nutrient for it to grow and multiply, or water with little or no renovation (still water). To eliminate this invasive vegetation, the suggestion is to remove it manually or mechanically and then introduce some copies of herbivorous fish grass carp, in the amount of one copy for every 10 square meters of water depth. If there are predatory fish in the tank, as traíras, peacock bass, painted, among others, should put big carp. Also, if possible, remove excess mud and a constant drive to perform or renewal of water, in order to hinder the spread of the plant. It is not recommended to apply chemicals in the lake.

Consultant: Jorge Meneses, biologist and consultant for fish, tels.: (11) 3081-4128 and (11) 9811-6744, tecnofishconsultoria@uol.com.br

Source: Globo Rural magazine