Estimation of mortality and growth parameters from the length frequency of a catch [model]
1979
Powell, D.G. (Arthur Rylah Inst. for Environmental Research, Heidelberg (Australia))
Four methods for analysis of a length frequency distribution are examined. The Beverton and Holt relationship Z/K = (L infinity-l)/(l-l)(, c) is shown to hold under a generalized version of the von Bertalanffy growth equation. It is shown how the shape of the length frequency curve can give rough estimates of Z/K. Alternatively, Z/K may be estimated by 2C('2)/(l-C)('2) where C('2) = Var (l)/(l-l)(, c)('2). Another relationship between Z/K and L infinity can be found by using the mean weight in the catch.
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