タテジマフジツボの飼育と變態

概要

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During the time from July to September, 1941, we reared the larvae of the barnacles, Balanus amphitrite hawaiiensis, B. amphitrite albicostatus and Tetraclita squamosa. The larvae of the two varieties of B. amphitrite were able to rear mostly up to the adult form settled on the wall of the glass jar, but in the case of T. squamosa they died in the cypris stage before settling. In the present study, however, observed only the process of the metamorphosis in B. amphitrite hawaiiensis. The rearing was much the same as that in the zoea of Penaeus japonicus, giving as its food the diatoms, Skeletonema costata, artificially cultured. The larva in the nauplius stage moulted 7 times within a week, where the 1st nauplius took only from 10 minutes to 2 hours for moulting and the following substages for each one day. The cypris larvae settled on the glass wall after swimming for a while and metamorphosed into the young barnacles; for the process they took mostly one day. The body plates of the barnacle were not discernible in the early stage soon after settling, but they became perceptible in a few days attaining nearly the adult form in 6 days.
1942-03-15