Catch and Growth Characteristics of Juvenile Ayu in the Eastern Coastal Waters Facing Kii Channel

概要

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The characteristics of fishing for the marine juvenile ayu (<I>Plecoglossus altivelis altivelis</I>) were investigated based on catch data from the fishing ground in the eastern coastal waters facing Kui Channel between 1980 and 2004. In years with rich yields, the amount of marine juvenile ayu fished remained the same for a prolonged period, and the area of the fishing ground was wider, compared to those years with poor yields. Age determination using the otolith between 1990 and 1997 indicated that in the years with rich yields, juvenile ayu would reach the fishing ground at a younger age in the order of hatching. In addition, these ayu resided in the fishing ground for shorter periods and their growth rates were higher than those in years with poor yields. These observations suggest a relationship between the growth rate and the level of the stock of the juvenile ayu.
日本水産増殖学会の論文