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Morphometric Differentiation between Artificially-released Red Sea Bream and O-age Wild Fish by Discriminant Function

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 wild 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 two, three or all of the four named above, discriminant functions were calculated to differentiate artificial fish from wild fish. Taking into consideration 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 two characters combining height at eye with each of body height, eye diameter and upper jaw length.