[The testing of growth functions for the length of Siliqua patula (Bivalvia) (author's transl)]

After preceding investigations of the author into increase and growth functions of organic matter the gained formulae are tested together with the classical functions. As an example the razor clam siliqua patula from the Alaskan coast seems rather well fitted because of the number of length measurements and the existence of an inflexion point of the growth curve. Non linear regressions are exercised following the Paul-method. Results are not seldom unexpected, sometimes leaving firmly introduced functions with smaller chances than recently developed ones. The number of parameters of the functions will not necessarily increase the quality of approximation. The best results arise from the increase ansatz W = k Wm/tp proposed by the author Sager 1979c).