ムラサキイガイ仔貝の短期間浸漬付着ロ-プへの付着

概要

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Settlement of larvae of marine mussel, Mytilus edulis galloprovincialis, was observed by a sequence sampling of rope collectors exposed for three or four days at Harumi pier in Tokyo Harbor from April to June, the maximum settling season, 1979. Young mussels on rope collectors were mainly caused by new settlement of pediveligers, and a small number of plantigrades were found resettled among them. The fluctuations in number of the settlement almost coincided with tidal changes as follows: the peaks in the number of settlement appeared during the spring tides and the bottoms of that were during the neap tides. Average settling number of mussel larvae per day and volume of attached suspended matters on the rope collectors exposed for a halp month were markedly larger than those on the collectors exposed for three or four days, and lt is suggested that the suspended matters have contributed to increase settling of the larvae and to inhibit the detachment of the settled larvae from the collectors. It seems likely from this observation that the mussel beds on new substrata under sea water are principally constructed by resettling of the late plantigrads, and that the number of late plantigrades in pelagic phase increases during the neap and mid-tide between spring and neap tides.
日本水産學會の論文