The food-unlimited growth rate of Atlantic cod (Gadus morhua)

Authors: Björnsson, Björn; Steinarsson, Agnar

Source: Canadian Journal of Fisheries and Aquatic Sciences, Volume 59, Number 3, March 2002 , pp. 494-502(9)

Publisher: NRC Research Press

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Abstract:

Results from laboratory experiments showed that food-unlimited growth rate (G) of Atlantic cod (Gadus morhua) declined linearly with fish weight (W) on a log–log scale at six different temperatures: 2, 4, 7, 10, 13, and 16°C. The intercept (αi) and slope (i) of these regressions increased linearly with temperature (T), implying that G = αi W i, where αi = 1 + 1T and i = 2 + 2T. Nonlinear fit of the four-parameter model showed that 1 was not significantly different from 0, and thus the following three-parameter model is suggested for the food-unlimited growth rate of cod ranging in size from 2 to 5000 g at any temperature from 2 to 16°C: G = (0.5735T)W(–0.1934–0.02001T). The results indicate that temperature in this size range has a much greater effect on the growth rate of small juvenile cod than on that of larger cod. The model predicts that the optimal temperature for growth of cod decreases with increased size of fish, from 14.3°C for 50-g fish to 5.9°C for 5000-g fish. Growth curves were derived for cod at constant and seasonally variable temperatures. Weight-at-age was calculated for different temperatures.

Des expériences en laboratoire démontrent que le taux de croissance de la morue en présence de nourriture illimitée (G) décroît de façon linéaire sur une double échelle logarithmique en fonction de la masse du poisson à 6 températures différentes, 2, 4, 7, 10, 13 et 16°C. Les points d'intersection (αi) et les pentes (i) de ces droites augmentent de façon linéaire en fonction de la température (T), si bien que G = αi Wi, où αi = 1 + 1T et i = 2 + 2T. Puisque l'ajustement non-linéaire du modèle à quatre paramètres indique que 1 n'est pas significativement différent de 0, le modèle suivant à trois paramètres permet de décrire la croissance avec nourriture illimitée chez des morues de 2–5000 g à toute température comprise entre 2 et 16°C: G = (0,5735T)W(–0,1934 + 0,02001T). La température a un effet plus important sur le taux de croissance des petites morues que sur celui des plus grandes dans cet intervalle de tailles. Le modèle prédit que la température optimale pour la croissance de la morue diminue en fonction de la taille, de 14,3°C chez les poissons de 50 g à 5,9°C chez ceux de 5000 g. Nous avons tracé des courbes de croissance pour les morues à températures constantes et à des températures qui varient d'après la saison. Nous avons aussi calculé la masse des morues des différents âges pour chacune des températures.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: March 1, 2002

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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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