アカシタビラメの初期生活史〔若狭湾におけるカレイ目魚類の初期生活史の研究-9-〕

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The early life history of a tongue fish Cynoglossus joyneri GÜNTHER was studied in the western Wakasa Bay, the Japan Sea. General morphology of the larvae and juveniles ranging from 5.75mm to 16.25mm BL, was described. The characteristic features of the fish in early larval stages were elongations of the first 2 dorsal fin rays and distributional patterns of melanophores on the body surface. Judging from gonad index and occurrence of larvae, actual spawning may occur during relatively long period from July to September in the western Wakasa Bay. Early poslarvae were caught mainly off Wakasa Bay, and late postlarvae were caught in the inner part of the Bay. Early juveniles were captured in the shallow water of the Bay, and this area may be their nursery ground. Food items in the gut contents were as follows: small copeods Microsetella norvegica and copepod nauplii in early larvae, copepods Paracalanus sp and M. norvegica in metamorphosis, and copepods Paracalanus sp. in early juveniles.
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