On the Behavior of BEYRICH's Slit Shell, Mikadotrochus beyrichii (HILGENDORF) Kept in the Aquarium

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  • 飼育環境下におけるオキナエビスガイの生態について
  • シイク カンキョウ カ ニ オケル オキナエビスガイ ノ セイタイ ニ ツイテ

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Abstract

1) In the early morning of 10th June, 1969, a living BEYRICH's slit shell (78×75mm), Mikadotrochus beyrichii, was collected from 180 meters depth offshore of Shima Peninsula (new locality). We succeeded to keep it for 52 days long at the Toba Aquarium. 2) Through the rearing, we found that the BEYRICH's slit shell may be one of the nocturnal animals, for it was observed to creep most actively in the period from midnight to early morning, and never moved at all in the daytime. 3) This slit shell recorded 18cm/min. to creep as maximum speed. We could recognize the reactions that the snail shrunk to lighting of photographic lamp or strobo flashes for camera. 4) When the slit shell was creeping to move, the paired tentacles, snout and foot were extended, and the shell was lifted up by its foot. Speed and direction to creep were irregular, and it will have a tendency to move along the corners of rearing tank or rocks in it. 5) In the aquarium conditions, the BEYRICH's slit shell ate a small quantity of the fresh muscle of Japanese horse mackerel (Trachurus japonicus), it showed, however, no interest to shucked short-necked clams (Tapes (Amygdala) philippinarum) or a kind of Laminarian seaweeds (Undaria pinnatifida). As the results of these behaviors, we assumed that it may be a carnivor. 6) By the living shell, we could observe that the proximal end of the slit formed a kind of siphon by the mantle edge and faeces were discharged through this siphon-like part.

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