判別関数を用いた外部形態によるマダイ人工放流魚と天然当歳魚の識別〔外部形態によるマダイ人工放流魚と天然当歳魚の比較と識別-2-〕

概要

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The present study aims at developing a method of differentiation of hatchery-reared and artificially-released red sea bream from wild fish, based upon their morphometric differences. Data used were the same measurements as those of the previous paper. In the previous paper, regression lines of each of 14 characters on fork length for artificial fish and weld fish were compared by means of covariance analysis. Among the 14 characters, a significance continued to be observed in body height, height at eye, eye diameter and upper jaw length. With tow, three or all of the four named above, discriminant functions were calculated to differentiate artificial fish from wild fish. Taking into consideratin morphological changes with growth, samples were classified at intervals of 10mm in fork length. Discriminant functions, Z, were examined class by class. Most of Z values obtained were effective to differentiate artificial fish from wild fish. A criterion value of Z, Z0, for each function was established. A fish with a Z value smaller than Z0 is to be judged as artificial fish, while one with a larger Z as wild fish. It is practical to use three functions with tow characters combining height at eye with each of body height, eye diameter and upper jaw length.
日本水産學會の論文