Use of floating aquatic macrophyte Pistia stratiotes in the treatment of pisciculture effluent in the state of Amazonas

Abstract

Patterns of water for fish farming and / or for the protection of natural fauna are lax as to bacteriological and aesthetic qualities although very demanding as the chemical characteristics as the fish do not require the presence of oxygen, organic matter and microorganisms as food, pH and temperature stability. Artificial eutrophication is one of the negative effects that the continuous release of effluents can cause aquatic ecosystems generating impacts harmful to local biodiversity. To check the efficiency of treatment of fish farming wastewater systems through the use of macrophytes, used the aquatic macrophyte Pistia stratiotes as "purifying agent" of the effluent generated by a fish farm. The treatment system consisted of an experimental tank excavated earth 120 m2 the which were allocated copies of macrophyte Pistia stratiotes collected in unpolluted lotic, distributed in the way tank to fill out approximately 30% of its surface. The results obtained suggest that treatment with the macrophyte Pistia stratiote is efficient in absorbing nutrients, and may thus be recommended as mitigation measure to avoid pollution and / or eutrophication of water systems.