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The effect of restricted springtime feeding on growth and maturation of freshwater-reared chinook salmon, Oncorhynchus tshawytscha (Walbaum)

1997; Wiley; Volume: 28; Issue: 7 Linguagem: Inglês

10.1046/j.1365-2109.1997.00893.x

1365-2109

C. L. Hopkins, Martin Unwin,

Aquaculture Nutrition and Growth

Aquaculture ResearchVolume 28, Issue 7 p. 545-549 The effect of restricted springtime feeding on growth and maturation of freshwater-reared Chinook salmon, Oncorhynchus tshawytscha (Walbaum) C L Hopkins, C L Hopkins National Institute of Water & Atmospheric Research Ltd, PO Box 8602, Christchurch, New Zealand * 22 Chepstow Avenue, Christchurch 8004, New ZealandSearch for more papers by this authorM J Unwin, Corresponding Author M J Unwin National Institute of Water & Atmospheric Research Ltd, PO Box 8602, Christchurch, New ZealandM J Unwin, National Institute of Water & Atmospheric Research Ltd, PO Box 8602, Christchurch, New ZealandSearch for more papers by this author C L Hopkins, C L Hopkins National Institute of Water & Atmospheric Research Ltd, PO Box 8602, Christchurch, New Zealand * 22 Chepstow Avenue, Christchurch 8004, New ZealandSearch for more papers by this authorM J Unwin, Corresponding Author M J Unwin National Institute of Water & Atmospheric Research Ltd, PO Box 8602, Christchurch, New ZealandM J Unwin, National Institute of Water & Atmospheric Research Ltd, PO Box 8602, Christchurch, New ZealandSearch for more papers by this author First published: 28 June 2008 https://doi.org/10.1046/j.1365-2109.1997.00893.xCitations: 14 AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Springtime fasting was used as a means to reduce the incidence of early maturation in freshwater cultured male chinook salmon Oncorhynchus tshawytscha (Walbaum) of New Zealand origin. The experiment was started with yearling fish at the beginning of September (spring) and completed in the following April (autumn) at the time of expected maturation. Feeding was restricted for 2 months (September-October) and 3 months (September-November) by offering food only on alternate weeks. In April, the control group, full fed throughout, had a significantly higher incidence (60%) of mature males then the two groups that had been fasted for 2 or 3 months in the spring. There was little difference in maturation rate in the latter groups (21% and 24%). Growth was depressed during fasting, relative to controls, but the mean weight of the group fasted for 2 months was not significantly different to that of the controls by April. References Alm G. (1959) Connection between maturity, size, and age in fishes. Report of the Institute of Freshwater Research, Drottningholm 40, 5 – 145. Bagenal T.B. (1969) The relationship between food supply and fecundity in brown trout, Salmo trutta L. Journal of Fish Biology 1, 167 – 182. Heath D.D., Heath J.W. & Iwama G.K. (1991) Maturation in chinook salmon, Oncorhynchus tshawytscha (Walbaum): early identification based on the development of a bimodal weight-frequency distribution. Journal of Fish Biology 39, 565 – 575. McCormick S.D. & Naiman R.J. (1984) Some determinants of maturation in brook trout, Salvelinus fontinalis. Aquaculture 43, 269 – 278. McDowall R.M. (1990) New Zealand freshwater fishes: A natural history and guide. Heinmann Reed, Auckland . Quinn T.P. & Unwin M.J. (1993) Life history patterns of New Zealand chinook salmon (Oncorhynchus tshawytscha) populations. Canadian Journal of Fisheries and Aquatic Sciences 50, 1414 – 1421. Rowe D.K. & Thorpe J.E. (1990a) Differences in growth between maturing and non-maturing male Atlantic salmon, Salmo solar L., parr. Journal of Fish Biology 36, 643 – 658. Rowe D.K. & Thorpe J.E. (1990b) Suppression of maturation in male Atlantic salmon (Salmo salar L.) parr reduction in feeding and growth during spring months. Aquaculture 86, 291 – 313. Rowe D.K., Thorpe J.E. & Shanks A.M. (1991) Role of fat stores in the maturation of male Atlantic salmon (Salmo salar) parr. Canadian Journal of Fisheries and Aquatic Sciences 48, 405 – 413. Thorpe J.E., Talbot C., Miles M.S. & Keay D.S. (1990) Control of maturation in cultured Atlantic salmon. Salmo salar, in pumped seawater tanks, by restricting food intake. Aquaculture 86, 315 – 326. Unwin M.J. & Glova G.J. (in press) Changes in life history parameters in a wild population of chinook salmon (Oncorhynchus tshawytscha) associated with releases of hatchery-reared fish. Canadian Journal of Fisheries and Aquatic Sciences 54. Unwin M.J. & Lucas D.H. (1993) Scale characteristics of wild and hatchery chinook salmon (Oncorhynchus tshawytscha) in the Rakaia River, New Zealand, and their use in stock identification. Canadian Journal of Fisheries and Aquatic Sciences 50, 2475 – 2484. Citing Literature Volume28, Issue7July 1997Pages 545-549 ReferencesRelatedInformation