Effects of acute temperature decreases on turbot fry and juveniles |
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Authors: | Magne Staurnes |
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Institution: | (1) SINTEF Applied Chemistry, Center of Aquaculture, N-7034 Trondheim, Norway |
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Abstract: | Turbot fry (10–20 mm) and juveniles (85–110 mm) were transferred directly from 16.0–16.5 C to 1.0 C, 2.5 C, 5.5 C or 8.0 C seawater. The fry were more sensitive to cold water than juveniles. The fry survived for 1 week at 8.0 C but not at 5.5 C, whereas juveniles survived at 5.5 C but not at 2.5 C. Transfer of juveniles to 1.0 C and 2.5 C seawater caused a high mortality, a marked increase in plasma Cl- concentration, decrease in muscle water content, and hyperglycaemia. Acclimation to 5.5 C (juveniles) or 8.0 C (fry and juveniles) markedly reduced the sensitivity to 1.0 C exposure. |
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Keywords: | Turbot (Scophthalmus maximus L ) Temperature tolerance Cold water Acclimation Mortality Osmoregulation |
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