Publicação: Desenvolvimento de alevinos de trairão (Hoplias lacerdae) na ausência de luz
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Sixty-six trairão (Hoplias lacerdae) fingerlings (average weight of 2.0±0.5 g and total length of 5.8±0.2 cm), trained to accept dry rations, were allotted to six 15-L aquariums, with aeration and controlled temperature (24.0±0.5°C), in a density of 0.7 juveniles/L, aiming to evaluate the effects of darkness on fish productive performance. The treatments consisted of two photoperiods: 12 hours light: 12 hours dark (12L:12D) and 0 hour light: 24 hours dark (OL:24D), with three replicates. Fingerlings were fed ad libitum a commercial extruded diet (42% CP), twice a day. The aquariums were cleaned daily for excrement withdrawal through siphoning, exchanging 1/4 total volume. At the end of the experiment (30 days), weight gain, feed:gain ratio and survival and cannibalism rates were evaluated. The results showed that darkness did not affect the productive performance of trairão juveniles.
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Hoplias lacerdae, Photoperiod, Trairao, aeration, controlled study, darkness, fish, nonhuman, photoperiodicity, pisciculture, water temperature, Hoplias
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Português
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Acta Scientiarum - Biological Sciences, v. 28, n. 1, p. 47-50, 2006.
