Abstract
Effective age composition studies in large fisheries demand sampling of very large numbers of fish. Establishment of a practical program of investigation calls for measures which reduce the actual age determination to a point where it can be conveniently handled. A method is described whereby age composition is determined from a large number of length measurements using a relatively small number of age determinations. The procedure is an independent modification of one suggested by Fridriksson in 1934 and is an improvement in that it gives more accurate results for those age groups at the extremities of the distribution. Samples of a Pacific coast flounder have been drawn upon to demonstrate the reliability of the method for various types of size distribution and for various levels in the intensity of age sampling.

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