南西諸島における有毒ガニの分布と生態に関する研究

概要

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Out of the three species of toxic crabs inhabiting in the Ryukyu and Amami Islands, the distribution and ecology of Zosimus aeneus and Atergatis floridus, both belonging to the family Xanthidae, were studied. In Japan, Atergatis floridus is one of the commonest beach crabs inhabiting from the Boso Peninsula to Kyushu Island. Zosimus aeneus is distributed as far as Hachijo-shima and Izu-Oshima Islands, and is collected mainly in the shallow coral reef in the Amami and Ryukyu Islands but does not exist in Kyushu ; Tanegashima and Yakushima Island located nearby Amami-Oshima. It seems that the variation of distribution is mainly due to the existence of the strong warm current of Kuroshio, which flow between Amami-Oshima and Yakushima Islands. From the fisheries point of view, it is needful for us to pay much attention on both Z. aeneus and A. floridus ; in the former, in respect of its strong toxicity, though the distribution is in partial and thin，and in the latter, in respect of its wide distribution and abundance in number, though its toxicity is not too strong. The inspections of the stomach contents of the Z. aeneus were carried out, with no questionable food discovered, the origin of the crab toxin left unclarified.
鹿児島大学の論文