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Modern fish farming is based upon best-practice breeding technology, environmental quality and productivity benefit. In this experiment we analyzed fish density effects on water quality, and afterwards on breeding efficiency of Tambaqui (Colossoma macropomum). Juveniles with an average weight of 13,6 +/- 4,1 g were reared in 40 m long irrigation channels, which were divided in 15 sections of 1 m(3) in each case. Three fish densities (60, 90 and 120 individuals per m(3)) were tested, with five replications. Water quality parameters were as follows: water temperature 28,0-31,7 degrees C, dissolved oxygen 5,9-7,4 mg L-1, pH 6,8-7,5, ammonium concentration 0,1-0,3 mg L-1, alkalinity 24,0-34,0 mg L-1 (CaCO3), hardness 24,0-37,0 mg L-1 (CaCO3, MgCO3), conductivity 0,07-106 mu S cm(-1) and total dissolved solids 18,37-53,00 mg L-1. The increase in fish weight was 35,76, 32,95 and 36,25 g for fish density of 60, 90, and 120 individuals per m(3), respectively. No difference among fish density was observed. In conclusion, there is the possibility of integrating the fish farming with other cultures, maximizing the use of water resources.

Cultivo de tambaqui em canais de abastecimento sob diferentes densidades de peixes