Americanae (AECID Library) · 2008 · 19 citations · 0 references
Life SciencesEcologyZoologyFish BiologyFish EcologyInvertebrate ZoologyFish Larval BiologyFish Larval EcologyFreshwater Fish EcologyLarval EcologyLarval PhysiologyMarine Larval BiologyEnvironmental Effects On Larval DevelopmentLarval Ecology Of InvertebratesLarval Feeding EcologyLarval Photoperiod ResponsesLight Responses In LarvaePhotoperiod Effects On DevelopmentPhotoperiod Effects On OvipositionPhotoperiod Effects On Reproduction
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.