福岡県津屋崎に生育するホンダワラ類5種の卵放出

概要

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Egg release in tagged individuals of five fucalean species was studied between June 1987 and June 1988 in Tsuyazaki, northern Kyushu, Japan, where water temperature ranges from 10.1 to 28.9°C. Sargassum macrocarpum released eggs in summer, S. autumnale and S. ringgol-dianum ssp. coreanum in autumn, and S. siliquastrum in spring. In Myagropsis myagroides, some individuals began to release eggs in early winter, but many individuals released eggs from late winter to mid-spring. These results indicate that egg release of fucalean species can be observed throughout the year in this study site. S. macrocarpum mainly released eggs both in the spring tides and the neap tides, and M. myagroides soon after the neap tides, but in other species eggs were not released at periodic intervals. Germlings remained on the receptacles for only one day in S. ringgoldianum ssp. coreanum and S. autumnale, two days in S. macro-carpum, from one to six days in S. siliquastrum, and from seven to eleven days in M. myagroides.
日本水産學會の論文