Percophis brasiliensis is a demersal species that constitutes an important resource of Argentine coastal fisheries. Nevertheless, information about bioenergetic dynamic of reproduction has not been reported. Therefore, seasonal variations of condition factors, biochemical composition and energy dens...

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Main Authors: Karina A. Rodrigues, Gustavo J. Macchi, Agueda Massa, María I. Militelli
Format: Article
Language:English
Published: Sociedade Brasileira de Ictiologia 2013-03-01
Series:Neotropical Ichthyology
Subjects:
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000100153
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Summary:Percophis brasiliensis is a demersal species that constitutes an important resource of Argentine coastal fisheries. Nevertheless, information about bioenergetic dynamic of reproduction has not been reported. Therefore, seasonal variations of condition factors, biochemical composition and energy density of different tissues were analyzed in order to determine the strategy of energy allocation during the reproductive cycle of this species. Condition indices (hepatosomatic and K) showed a seasonal pattern opposite to that observed for gonadosomatic index, which was characterized by higher values during the reproductive period (spring-summer), decreasing at the end of spawning. Biochemical composition of different tissues also showed a clearly seasonality associated to reproductive cycle. Analysis of energy density variation of liver indicates that P. brasiliensis accumulate reserves in winter before reproduction, which later decrease during the spawning season. In contrast, the energy density in muscle did not show significant differences among seasons, indicating that individuals could be also using an external source of energy during spawning. Therefore, it is possible that P. brasiliensis respond to an intermediate strategy of energy allocation, combining characteristics of both capital breeders (stores energy previous to the onset of reproductive activity) and income breeders (acquire energy by active feeding during spawning period).<br>Percophis brasiliensis &#233; uma esp&#233;cie demersal que constitui um recurso importante para a pesca costeira na Argentina. N&#227;o obstante, a informa&#231;&#227;o sobre a din&#226;mica bioenerg&#233;tica da reprodu&#231;&#227;o n&#227;o tem sido reportada. Assim, as varia&#231;&#245;es sazonais dos fatores de condi&#231;&#227;o, composi&#231;&#227;o bioqu&#237;mica e densidade de energia de diferentes tecidos foram analisados para determinar a estrat&#233;gia de aloca&#231;&#227;o de energia durante o ciclo reprodutivo da esp&#233;cie. Os &#237;ndices de condi&#231;&#227;o (hepatossom&#225;tico e K) mostraram um padr&#227;o sazonal oposto ao observado para o &#237;ndice gonadossom&#225;tico, o qual foi caracterizado por valores mais elevados durante o per&#237;odo reprodutivo (primavera-ver&#227;o), diminuindo no final da desova. A composi&#231;&#227;o bioqu&#237;mica de diferentes tecidos tamb&#233;m mostrou uma sazonalidade claramente associada ao ciclo reprodutivo. An&#225;lise da densidade de energia do f&#237;gado indica que P. brasiliensis acumula energia no inverno, antes da reprodu&#231;&#227;o, que mais tarde decresce durante a &#233;poca de desova. Em contraste, a densidade de energia no m&#250;sculo n&#227;o mostrou diferen&#231;as significativas entre as esta&#231;&#245;es do ano, indicando que os indiv&#237;duos poderiam ter tamb&#233;m uma fonte externa de energia durante a reprodu&#231;&#227;o. Portanto, &#233; poss&#237;vel que P. brasiliensis responda a uma combina&#231;&#227;o das estrat&#233;gias "capital breeder" (armazenam a energia antes do in&#237;cio da atividade reprodutiva) e "income breeder" (adquirem energia atrav&#233;s da alimenta&#231;&#227;o ativa durante o per&#237;odo de desova).
ISSN:1679-6225
1982-0224