Efeitos da troca de água sobre os índices zootécnicos e qualidade dos efluentes na criação intensiva do tambaqui {Colossoma macropomum) em viveiros escavados no município de Manaus,Amazonas.

Abstract

In the last decades, research in the area of ​​pisdcultura with native species such as tambaqui (Colossoma macropomum) has been carried out in Amazonia and have indicated that these species present good zootechnical indexes in confinement environments, presenting good resistance to handling and diseases, good feed acceptance, adequate carcass yield and good consumer acceptance. The main objective of this work was to characterize and compare the effluents and water quality of the intensive cultivation of tambaqui in nursery systems excavated with and without periodic water renewal. In this work, tambaqui juveniles with initial mean weight of 118.83 g were stocked in six nurseries excavated at 50m ^ with density of one fish / m, for five months. Fish were fed twice daily with commercial extruded feed containing 28% crude protein. For this, two treatments were used, being Treatment 1 (TI) in nurseries with periodic water renewal and Treatment 2 (T2) without periodic water renewal. The zootechnical, water quality and haematological parameters did not present significant differences between treatments (p <0.05). The quality of the effluent generated was the same with the exception of the nitrite, higher in the TI. The total discharge of the effluent was higher in the TI for total dissolved solids, BOD and nitrite. It was observed that the weekly renewal of 20% of the nursery water volume does not have a great influence on the quality of the water and the effluents, on the haematological parameters of breeding. of tambaquis grown in the intensive system in excavated nurseries. Therefore, the renovation of water in the molds of this work shows no advantage, increasing water consumption and production costs.