Produtividade de juvenis de Tambaqui (Colossoma macropamum) cultivados em tanques-redes sob diferentes densidades.

Abstract

The fish with the highest commercial importance is Tambaqui, because its favorable zootechnical characteristics have made it promising for production in several forms of cultivation, being in net tanks more profitable for the producer, with low production cost and greater management control. The different densíties that the organisms undergo are crucial for a better productive performance, directly influencing the biomass, and consequently the " profitability. The objective of this work was to evaluate the productivity of Jjuveniles of : Tambaqui (Colossoma macropomum) under different stocking densities grown in net tanks. The experiment was conducted in tropical aquaculture laboratory (LAqTrop), UFRA - Belém, in 1m3 net tanks with densities of 15, 25 and 35 ind / m3, in triplicates, with a completely - randomized design. Parameters of water quality were analyzed and biometrics performed every j 15 days. After 45 days of cultivation, the parameters were found to be within the appropriate levels, without totally damaging the yield of the crop. The average density (25 ind / m3) worked : showed better growth rate and feed conversion than the other densíties tested. The final : biomass, biomass increase and productivity parameters were more relevant in the higher density, presenting a proportional increase between biomass and density, in the order of 97.56%. Thus, the creation of tambaqui is feasible at a density of 35 ind / m3, taking into account the higher productivity.