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Journal of Biological Rhythms
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Circannual Rhythms of Gonadal Maturation in Female Rainbow Trout (Oncorhynchus mykiss)

James Duston

Institute of Aquaculture, University of Stirling, Stirling FK9 4LA, Scotland, United Kingdom

Niall Bromage

Institute of Aquaculture, University of Stirling, Stirling FK9 4LA, Scotland, United Kingdom

Individually identified, 2-year-old female rainbow trout were maintained for up to 51 months on a constant schedule of 6 hr light and 18 hr darkness (LD 6:18), constant temperature (8.5-9.0°C), and constant feeding rate. The fish exhibited free-running circannual rhythms of gonadal maturation and ovulation, which were self-sustaining for up to three cycles. The periodicity of the rhythm showed variation between fish and in successive cycles for the same fish, ranging from approximately 11 to 15 months.

Journal of Biological Rhythms, Vol. 6, No. 1, 49-53 (1991)
DOI: 10.1177/074873049100600106
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