Abstract
Abstract Growth in developing turbot larvae can be expressed independently of temperature when using effective day-degrees (D°eff) as an index of development. The calculation of D°eff is based on the principle of thermal summation whereby the rate of development is linearly related to the ambient temperature above a species-specific threshold temperature (T0) at which development is theoretically arrested. The T0 for turbot embryos is 5.3°C. The increase in wet body mass of developing turbot larvae at 14, 18, and 22°C can be aligned into a single exponential relationship regardless of incubation temperature when using D°eff as the index of development. Previous attempts to relate physiological processes in poikilothermic animals, including fish, to incubation temperature are discussed.
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