ELECTRONICAL LARVICULTURE NEWSLETTER ISSUE 94

15 DECEMBER 1999

TEMPERATURE DEPENDENCY OF EARLY GROWTH OF TURBOT (SCOPHTHALMUS MAXIMUS L.) AND ITS IMPLICATIONS FOR DEVELOPMENTAL PROGRESS

F.A. Weltzien, M. Planas, H.J. Fyhn-1999

Journal of Experimental Marine Biology and Ecology, 242 (2) : 201-210 (from Current Contents)

Abstract:

Growth in developing turbot larvae can be expressed independently of temperature when using effective day-degrees (D-eff(o)) as an index of development. The calculation of D-eff(o) 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 (T-0) at which development is theoretically arrested. The T-0 for turbot embryos is 5.3 degrees C. The increase in wet body mass of developing turbot larvae at 14, 18, and 22 degrees C can be aligned into a single exponential relationship regardless of incubation temperature when using D-eff(o) as the index of development. Previous attempts to relate physiological processes in poikilothermic animals, including fish, to incubation temperature are discussed.

(Inst Marine Res, Austevoll Aquaculture Res Stn, N-5392 Storebo, Norway, e-mail : finn-arne.weltzien@imr.no)

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