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The effects of fluctuating seasonal and constant temperatures on the photoperiodic advancement of reproduction in female rainbow trout

, : The effects of fluctuating seasonal and constant temperatures on the photoperiodic advancement of reproduction in female rainbow trout. Proceedings of the Fourth International Symposium on the Reproductive Physiology of Fish, held at the University of East Anglia, Norwich, UK, 7-12 July, 1991: 154-156

Spawning of rainbow trout (Oncorhynchus mykiss) broodstock was advanced by 4 months in groups of fish exposed to 14 wk of long days (18-h light:6-h darkness), beginning on 1 Feb., followed by short days (6L:18D), compared with the natural photoperiod, irrespective of whether the fish were maintained on a constant or seasonally fluctuating water temp. The fluctuating temp. of river water produced only a small modifying effect on spawning date.

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