Improving growth in juvenile turbot (<Emphasis Type="Italic">Scophthalmus maximus</Emphasis> Rafinesque) by rearing fish in switched temperature regimes |
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Authors: | Albert K Imsland Edward Schram Bjorn Roth Rian Schelvis-Smit Kees Kloet |
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Institution: | (1) Akvaplan-niva Iceland Office, Akralind 4, Kopavogur, 201, Iceland;(2) Wageningen IMARES, P.O. Box 68, IJmuiden, AB, 1970, The Netherlands;(3) Department of Biology, University of Bergen, High Technology Centre, Bergen, 5020, Norway;(4) Zeeland Vis BV, Krab 12, Yerseke, PA, 4401, The Netherlands |
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Abstract: | The effect of thermal history (16 and 20°C) on growth of juvenile turbot, Scophthalmus maximus (initial mean weight 72.6 g, n = 157) was studied. Fish were divided into four groups, two groups remaining at constant temperature (C16, C20), while fish
in the other groups were transferred from either 16 to 20°C (F16-20) or from 20 to 16°C (F20-16). Between 35 and 42 fish in
each tank were individually tagged at the start of the experiment. The final mean weights were significantly higher in the
F20-16 group (230 g) than in the C20 (213 g), F16-20 (211 g) and C16 (205 g) groups. The overall growth rate was highest in
the F20-16 group (1.17% day−1) but comparable in the three other groups (1.00–1.04% day−1). Our findings indicate that, even at near-optimal temperature for a given size, the temperature history of the fish may
influence future growth. Based on these indications, we conclude that as turbot grow larger, the temperature should be reduced
to take advantage of the change in optimal temperature for growth with increasing fish size rather than rearing at constant
temperatures. |
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Keywords: | Growth Temperature regimes Turbot (Scophthalmus maximus) |
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