Present address: Marine Scotland – Science, Marine Laboratory, P. O. Box 101, 375 Victoria Road, Aberdeen, AB11 9DB Scotland, U.K.
Implications of a warming North Sea for the growth of haddock Melanogrammus aeglefinus
Article first published online: 28 APR 2011
Journal of Fish Biology © 2011 The Fisheries Society of the British Isles. No claim to original US government works
Journal of Fish Biology
Volume 78, Issue 7, pages 1874–1889, June 2011
How to Cite
Baudron, A. R., Needle, C. L. and Marshall, C. T. (2011), Implications of a warming North Sea for the growth of haddock Melanogrammus aeglefinus. Journal of Fish Biology, 78: 1874–1889. doi: 10.1111/j.1095-8649.2011.02940.x
- Issue published online: 8 JUN 2011
- Article first published online: 28 APR 2011
- (Received 13 September 2010, Accepted 7 February 2011)
- climate change;
- density dependence;
- individual yield;
- von Bertalanffy
The present study aimed firstly, to test for a temperature effect on North Sea haddock Melanogrammus aeglefinus growth and secondly, to develop a model that could be used to assess total length (LT) and mass (M)-at-age response to different temperature scenarios. The von Bertalanffy growth model was fitted on a cohort-by-cohort basis from 1970 to 2006. The asymptotic LT (L∞) was negatively correlated with temperature while the rate at which L∞ is reached (K) was positively correlated with temperature. K was negatively correlated with density, whereas no effect on L∞ was observed. These effects were incorporated into a von Bertalanffy model which was extended to include temperature and density as explanatory variables. Only the temperature variable was significant. Fitting the extended von Bertalanffy model revealed that L∞ decreased while K increased with increasing temperature, resulting in up to a 40% loss of individual yield at older ages. The dramatic decline observed in the mean age at which 50% of the population becomes mature suggests that higher temperatures resulted in larger young M. aeglefinus that matured earlier and therefore reached a smaller maximum size. In a global warming context, the loss of individual yield observed at old ages is likely to reduce the fisheries yield for M. aeglefinus in the North Sea.