モ場の魚の群集生態学的研究-3-

概要

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The growth rates of Sebastes inermis, shown as a collective result of its living in the Zostera area, Matsushima Bay, were observed as 2.8-9.4g/kg/day for the 0-year and 1.3-3.5g/kg/day for the 1-year fish. These rates are rather slow compared with such pelagic fish mackerel or saurel, or with such demersal fish plaice or flounder. The conversion efficiencies of small crustaceans to the body substances of S. inermis on the above growth rates were calculated basing on the feeding experiments as 15-27 per cent for the 0-year and 10-17 per cent for the 1-year fish on calorific equivalent, and these rates are also rather low. The dominant species S. inermis living in the Zostera area is not assumed to be an efficient fish for production. The fish in the Zostera area live competing with each other and occupy respectively a trophic niche, organizing a fish community as stated in the previous reports. It is necessary to investigate how to converge the food organisms produced in the Zostera area toward the most efficient and valuable fish in this community for raising production.
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