アラメガレイの初期生活史〔若狭湾におけるカレイ目魚類の初期生活史の研究-8-〕

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The early life history of a flounder Tarphops oligolepis (BLEEKER) in the western Wakasa Bay and adjacent waters, the Japan Sea was studied. General morphology of the postlarvae and juveniles ranging from 2.69mm to 10.90mm BL, was described. The characteristic features of this fish in early larval stages were elongations of the dorsal fin rays and distributional patterns of melanophores on the body surface, forming faint transverse bands. Judging from gonad index and occurrence of larvae, actual spawning may occur during the period from May to July in the western Wakasa Bay. Postlarvae and juveniles were caught mainly in nearshore region, and this area may be their spawning and nursery ground. Analyses of the gut contents showed that the food organisms are copepod nauplii in early postlarvae, copepods in late postlarvae and mysids in juveniles, respectively. The early life histories of the three bothid flatfishes, Paralichthys olivaceus, Pseudorhombus pentophthalmus and Tarphops oligolepis, in the western Wakasa Bay were compared, and relation between morphological differences and ontogenetic migration in pelagic phase was discussed.
日本水産學會の論文