タイリクバラタナゴの成熟に関与する光周性の発現と発達〔英文〕

概要

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The rose bitterling Rhodeus ocellatus ocellatus, Cyprinidae, a spring and summer breeder, was monthly captured and exposed to various photoperiods at 25°C during the breeding season. It was demonstrated that, starting from July, gonadosomatic indices (GSIs) were reduced at short photoperiods i.e. photoperiodism involved in the gonadal activity was developed. In a longterm rearing experiment, the photoperiodic involvement was found to develop in female fish prevented from spawning as well as in the fish keeping cyclic ovulation and oviposition. Low temperatures delayed both development and manifestation of the photoperiodic involvement. These results suggest that the photoperiodism develops in relation to continuation of full maturity in the fish or some sort of fatigue accompanying the continuation.
日本水産學會の論文