瀬戸内海におけるサヨリの産卵 : I.流れ藻などに対する産卵

概要

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Eggs of halfbeaks adhering to drifting materials are seen during April-July. Drifting materials used as spawning beds by halfbeaks consist of various kinds of plants, that is, Sargassum spp., Zostera marina, Chorda filum, Enteromorpha prolifera, and occasionally, straw-mat, twigs of tree or bamboo, etc. The spawning ground extends almost over the whole areas of this sea, but spawnings happen infrequently in the areas under severe influences of fresh water. Eighty percent or more of drifting seaweeds are adhered by halfbeak eggs during the period from the middle of May to the middle of June, and 20,000-50,000 eggs per 1 kg weeds are seen during this period. Halfbeaks spawn in the daytime as well as at night. Parent fishes lay eggs while passing through a mass of weeds or lying on weeds, and sometimes they are tangled with weeds and end in death. Spawning of halfbeaks on seaweeds growing on the coast has not yet been observed in this sea.
1966-08-01