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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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Seasonal patterns of growth and expenditure in juvenile Atlantic salmon

Jones, W. and Gurney, William and Speirs, Douglas and Bacon, P.J. and Youngson, A.F. (2002) Seasonal patterns of growth and expenditure in juvenile Atlantic salmon. Journal of Animal Ecology, 71. pp. 916-924. ISSN 0021-8790

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Abstract

1. We report a modelling study of a data-set describing the growth of individual Atlantic salmon (Salmo salarL.) parr in the Girnock Burn (Scotland). A development of the compensatory growth model due to Broekhusien et al. (1994) was fitted to these data by numerical optimization. 2.The model uses carbon mass as a surrogate for an energy currency. This mass is divided into structure and reserve components, so as to describe decoupled changes in length and wet-weight. 3. Using the same parameters for all fish, our model explained 83% of the variability in length and weight at age. Adding a single additional parameter for each individual enabled the model to explain over 96% of length and weight variability. 4. Weak negative correlation between size at first capture and within-study growth argues against genetic causality of observed growth variability. 5. The energetic basis of our model enables us to infer time-series of net assimilation and basal maintenance rates for the observed individuals. Maximal growth occurs early in the season when high assimilation is accompanied by low temperatures and maintenance rates. In late season, continuing high assimilation is balanced by high maintenance rates consequent on summer temperatures.