Influência do fotoperíodo no desenvolvimento de juvenis de tambaqui (Colossoma macropomum)

Abstract

One hundred and sixty tambaqui fingerlings (Colossoma macropomum) (average weight of 11.01±2.08 g and total length of 7.8±0.18 cm) conditional in sixteen aquariums of 40 liters of water with temperature of 29.1±0.413°C, density of stockage of 0.25 fingerling/l and constant aeration, with the objective to evaluate the amount of light in the productive performance of the fish. The treatments had consisted of the photoperiods: T1=6 hours of light: 18 hours of dark (06HL:18HE), T2=12HL:12HE, T3=18HL:06HE and T4=24HL: 0HE, with four repetitions each. The fingerling had been fed two times a day, with extrused commercial ration (28% of rude protein). The total volume of water was changed 40 times daily. To the end of 32 days, it was evaluated total length, standard length, height, consumption of ration, weight gain and survival. The results show that greater photoperiods had influenced positively the productive performance of tambaqui fingerlings.