内湾および干潟における物質循環と生物生産【58】播磨灘1.播磨灘の漁獲量推移の特徴

摘要

The catch of fish in Harima Sea has showed a peak of about a hundred thousand tons at 1979 and decreased to about thirty five thousand tons at 2005. The catches of shellfish and marine alga have decreased drastically between 1978 and 1986. The catch of crustacean and mollusk decreased from forty eight thousand tons at 1970' to twenty thousand tons at 2005. The catch of indigenous species in inland sea has been forty eight thousand tons at 1970 and twenty thousand tons at 2005. The most catch of indigenous species are sand eel. The fish catch of species entering into inland sea showed a peak(fifty eight thousand tons)at 1979 and decreased around ten thousand tons after 1990 and has been occupied by species(average 80 %)which are sardine and anchovy. The catches of horse mackerel and mackerel have been second catches after that of sardine and anchovy. These transitions of fish catch in Harima Sea will be examined from the interaction between fishes and the environment of fish place.