クロウシノシタの初期生活史〔若狭湾におけるカレイ目魚類の初期生活史の研究-5-〕

概要

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The early life history of a tongue fish Paraplagusia japonica (TEMMINCK et SCHLEGEL) was studied in the western Wakasa Bay and adjacent waters, the Japan Sea. General morphology of the larvae and juveniles ranging from 5.95mm to 12.30mm BL was described. The characteristic features of this 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, acutal spawning may occur during the relatively short period from June to July in the western Wakasa Bay. Early postlarvae, late postlarvae and early juveniles were caught mainly in Maizuru Bay, Yura River estuary and nearshore regions around Wakasa Bay. These areas may be their spawning and nursery ground. Food items of the gut contents were as follows: copepods nauplii, small copepods and copepod eggs in early larvae, copepods and copepod nauplii in metamorphosis, and, copeopds and amphipods in early juveniles.
日本水産學會の論文