Tambaqui growth and survival when exposed to different photoperiods
The use of different photoperiods (light) were investigated during tambaqui (Colossoma macropomum) juvenile growth under captivity. Light intensity tested was: continuous dark (24hrs without light), natural photoperiod simulation (10hrs of light and 14hrs without light) and continuous light (24 with...
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Published in | Acta amazonica Vol. 36; no. 3; pp. 381 - 384 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Instituto Nacional de Pesquisas da Amazônia
2006
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Subjects | |
Online Access | Get full text |
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Summary: | The use of different photoperiods (light) were investigated during tambaqui (Colossoma macropomum) juvenile growth under captivity. Light intensity tested was: continuous dark (24hrs without light), natural photoperiod simulation (10hrs of light and 14hrs without light) and continuous light (24 with light). No mortality was recorded among treatments. Significant differences was observed after 50 days of experiment among mean fish weight, fish kept under a continuous darkness showed a better specific growth rate (6.02%) when compared to control fish (natural photo period, 3.67%). Fish exposed to continuous light presented the lowest mean specific growth rate (2.04%). It is possible to improve tambaqui juvenile weight gain performance when kept under continuous darkness.
Investigou-se o uso de diferentes fotos períodos (iluminação) durante o crescimento de juvenis de tambaqui (Colossoma macropomum) em cativeiro. As intensidades testadas foram: escuro contínuo (24hs sem luz), simulação do foto período natural (10hs de luz e 14hs sem luz) e iluminação contínua (24hs de luz). Não houve mortalidade nos diferentes tratamentos. Diferença significativa entre as médias do peso foi observada após 50 dias de experimento, a exposição ao escuro contínuo apresentou o melhor índice de crescimento específico (6,02%) em relação ao controle (foto período natural, com 3,67%). O menor índice de crescimento médio foi observado na exposição à iluminação contínua (2,04%). Assim, pode-se melhorar o desempenho de ganho de peso para juvenis de tambaqui quando mantidos no escuro contínuo. |
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Bibliography: | 10.1590/S0044-59672006000300015 http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672006000300015 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1 |
ISSN: | 0044-5967 0044-5967 |
DOI: | 10.1590/S0044-59672006000300015 |