[Length growth of the North Sea plaice (Pleuronectes platessa) (author's transl)].

Values of the length growth of the North Sea plaice (Pleuronectes platessa) dating back to the decade from 1929 to 1938 and thus being free from possible pollution effects of later years are submitted to a nonlinear regression. Altogether 15 functions of organic growth were taken into account, all of them yielding asymptotic growth during the whole live span. Functions with finite growth time gave no solution. Moreover only a few functions showed a turning point leaving grave doubts about its existence. As was already the case with the Alaskan razor clam, the North Sea turbot and the Greenland cod the increase relation W = kWm/(t + t0)p proposed by the author brought the best results.