Abstract
One of the good fishing grounds for the round herring is off the western coast of the San'in district. Other main fishing grounds along the coast of San'in district lie around Oki islands and off the coast of Kyushu. A comparison of the relative abundances at two stages, the juvenile and the spawner, was made in order to understand the population dynamics of the round herring that dwells off the western coast of Shimane Pref. The results indicate that the relationship between the Parent and the Progeny well fits to a density dependent reproduction curve. It was, also, found that this species spawns from May to June off Hamada and consists of several subpopulations that are found off the coast of San'in district. The increase in mean fork length over the fishing season, based on measurements, give a growth curve of the round herring. Round herrings off the western coast of San'in district grow up 17cm in mean fork length at the end of the year of birth.
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