Influência do fotoperíodo no crescimento e sobrevivência de póslarvas de piracanjuba Brycon orbignyanus (Valenciennes, 1849) (Osteichthyes, Characidae)
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This paper aims at studying the influence of photoperiod on the cultivation of Brycon orbignyanus (Valenciennes, 1849) (Osteichthyes, Characidae) post-larvae submitted to four treatments: 0L-24D (L=Light; D=Dark), 10 - L14D, 14L - 10D and 24L-0D, with 3 repetitions. Post-larvae measuring 7.8±0.7mm and weighting 3.5±0.8mg were distributed in 12 aquariums (10L), stocked with 12 post-larvae per aquarium. Fishes were fed daily with Artemia sp. nanplii, in 10 days experiment. A positive relationship between the survival rate (88.9±9.7%) observed in the treatment with 24 hours of luminosity, and the lowest (58.3±8.3%), in the treatment with 24 hours of darkness. No difference was showed (P>0.05) in the mean length and weight of the post-larvae, although there was greater heterogeneity among the post-larvae cultivated at the longer darkness period.
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Brycon orbignyanus , Cannibalism , Fish larvae , Photoperiod , animal experiment , animal food , aquatic environment , Artemia , cannibalism , controlled study , darkness , fish , larval development , light , luminance , measurement , nonhuman , photoperiodicity , survival rate , Animalia , Artemia sp. , Brycon , Characidae , Osteichthyes , Pisces , Vertebrata
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Português
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Acta Scientiarum - Biological and Health Sciences, v. 24, n. 2, p. 439-443, 2002.
