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Abstract : |
Standard lengths of adult Japanese anchovy Engraulis japonicus, collected mainly twice a month during 1997-98 in Kagoshima Bay, southern Japan showing one or two length groups. Otoliths from each group were ground thinly, and widths of first 10 and next 10 micro-rings were measured. The widths of first 10 micro-rings from each length group were clearly distinguished into either narrower or wider width groups. Gonadosomatic indices of the narrower group were high in autumn and those of the wider group in spring, indicating the former group being autumn population and the latter spring one. Each two cohorts in the narrower and wider groups, recognized in the frequency distribution of standard length showed that the narrower cohorts grew better than the wider ones., |
