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The effects of seasonal alterations in ration on fecundity and maturation in rainbow trout (oncorhynchus mykiss)

Published online by Cambridge University Press:  24 November 2017

N. Bromage  and
J. Jones
N. Bromage
Affiliation:
Institute of Aquaculture, University of Stirling, Stirling FK9 4LA, Scotland
J. Jones
Affiliation:
Institute of Aquaculture, University of Stirling, Stirling FK9 4LA, Scotland
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Extract

Feeding different groups of 1 year-old prepubertal female rainbow trout for 0, 4, 8 or 12 months on either high (1.0% body weight day-1) or low (0.4%) rations produced significant changes in fecundity, total egg volume and in the percentages of fish which spawned. Fish fed high ration for the first 4 or 8 months of the year-long cycle had up to 56% higher fecundities even after weight influences had been partitioned by covariance analysis. Groups of fish fed high ration for the first 4 months of the cycle included the highest percentages of spawning fish. By optimising feeding regimes commercial hatcheries could produce up to 3x more eggs from existing stocks.

Type
Fish
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1992 , March 1992 , pp. 81
Copyright
Copyright © The British Society of Animal Production 1992

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References

Bromage, et al (1990) Fecundity, egg size and total egg volume differences in 2 stocks of rainbow trout. Aquacult. & Fish. Man. 21, 269–284.Google Scholar