[Length growth of the North Sea turbot (Scophthalmus maximus L. male) (author's transl)].

The testing of variety of growth functions of traditional or recently established status as started with the Alaskan razor clam (Sager 1980a) is continued for the length/age relation of the North Sea turbot. Whilst well known functions as the Gompertz must be abandoned in this case, the Richards function and the reciprocal function preferred by Krüger (1973) are in a good position but surpassed by a newly developed function of the author resulting from the increase ansatz W = kWm/(t + to)p (Sager 1980c). Thus the already traced line with excellent results from W = kwm/tp for the approximation of the length growth of the razor clam has found its direct extension although the resulting growth functions differ in their structure due to different ways of integration.