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Growth, temperature, and density relationships of North Sea cod (Gadus morhua)

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This study presents an analysis of the relationship between ambient temperature, cod density, fishing mortality, prey fish biomass, and growth of North Sea cod (Gadus morhua) as estimated from survey catches during the period from 1983 to 2006. Growth of young cod was positively related to temperature; however, although temperature increased, distribution of 1-year-olds changed concurrently and no increase in length at age 1 occurred. Growth from age 1 to age 2 decreased as ambient biomass of sandeel and density of cod decreased, whereas growth of cod older than 2 years decreased with increasing density of cod and increased with increasing biomass of demersal fish prey. Though growth of juveniles was strongly positively correlated to ambient temperature, no indication of direct temperature limitation of growth of older North Sea cod was found.

Notre étude présente une analyse qui relie la croissance de la morue de la mer du Nord (Gadus morhua) à la température ambiante, la densité des morues, la mortalité due à la pêche et la biomasse des poissons proies d’après les captures d’inventaire faites durant la période de 1983 à 2006. Il y a une relation positive entre la croissance des jeunes morues et la température; cependant, bien que la température ait augmenté, la répartition des poissons de 1 an a changé au même moment, si bien qu’il n’y a pas eu d’augmentation de la longueur à l’âge 1. La croissance de l’âge 1 à l’âge 2 a diminué, alors que la biomasse des lançons et la densité des morues dans le milieu ont baissé; par ailleurs, la croissance des morues âgées de plus de 2 ans a diminué avec l’augmentation de la densité des morues et elle a augmenté avec la biomasse croissante des poissons proies démersaux. Bien que la croissance des jeunes soit en forte corrélation positive avec la température ambiante, il n’y a pas d’indication qu’il y a une limitation directe de la croissance des morues plus âgées de la mer du Nord par la température.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2008-03-01

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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