Journal Article

Effect of temperature and food availability on reproductive investment of first-time spawning male Atlantic cod, <i>Gadus morhua</i>

Michio Yoneda and Peter J. Wright

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 62, issue 7, pages 1387-1393
Published in print January 2005 | ISSN: 1054-3139
Published online January 2005 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1016/j.icesjms.2005.04.018
Effect of temperature and food availability on reproductive investment of first-time spawning male Atlantic cod, Gadus morhua

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This study demonstrates how temperature and food availability affect growth, maturation, and sperm production in first-time spawning male cod in captivity. Cod, prior to the onset of maturation, were held under four different varying temperature and feeding regimes between November 2002 and March 2003. Lower food availability resulted in poor growth and body condition. Decreasing temperature partly led to slower growth in fish that matured during the experiment. Low temperature resulted in lesser proportions of mature fish relative to the higher temperature treatments. Higher temperature and food availability resulted in higher sperm production (testicular weight and gonadosomatic index). Our findings suggest that variation in food availability would mainly affect the growth and condition and the level of gamete production whilst variation in temperature would affect the proportion of males that mature. These results are contrasted with similar data for female cod.

Keywords: cod; food; growth; maturation; temperature

Journal Article.  4230 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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