土佐湾沖の流れ藻の藻類学的研究

概要

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An abundance of floating seaweeds depends upon the movement of the ocean currents around Japan. Young fishes, especially the juvenile of yellowtail, which live together with floating seaweeds during spring to early summer, are collected and cultred on a large on a large scale by fishermen. Thereofre, it is important to know the distrbution of floating seaweeds both in quantity and quality for the developnment of the fisheries resources. The survey of floating seaweeds was conducted many times by using vessels and fishermens boats during 1980-1982 in the Pacific Ocean near the coast of Shikoku Island of southern Japan. The floating seaweeds wree more abundant from April to May. The individual bulks ranged from 0.5 to 5.0kg in this area. These floating masses were composed of mainly the genus SARGASSUM. Although 29 species were recorded along the coast of Shikoku Island, S. horneri, S. patens, S. tortile and S. serratfolium were the most dominant of the floating seaweeds. Plants were fonud in almost healthy conditions with holdfast and receptacles intact. They seemed to have drifted from the nearcoast. Characteristicall, floating seaweeds of southern Japan, occur in small bulks during April-May and decline by the end of August.
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