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Gametogenesis and sex steroid profiles in cultured coho salmon (Oncorhynchus kisutch, Walbaum)

1998; Wiley; Volume: 280; Issue: 6 Linguagem: Inglês

10.1002/(sici)1097-010x(19980415)280

1097-010X

Francisco Estay, Roberto Neira, Nelson F. Díaz, Luis Valladares, Alfredo Torres,

Fish Ecology and Management Studies

Journal of Experimental ZoologyVolume 280, Issue 6 p. 429-438 Reproductive Biology Gametogenesis and sex steroid profiles in cultured coho salmon (Oncorhynchus kisutch, Walbaum) Francisco Estay, Francisco Estay Faculty of Sciences, University of Chile, Santiago, ChileSearch for more papers by this authorRoberto Neira, Roberto Neira Faculty of Agricultural and Forestry Sciences, University of Chile, Santiago, ChileSearch for more papers by this authorNelson F. Diaz, Corresponding Author Nelson F. Diaz [email protected] Faculty of Sciences, University of Chile, Santiago, ChileUniversity of Chile, Dept. of Ecological Sciences, Casilla 653, Santiago, Chile===Search for more papers by this authorLuis Valladares, Luis Valladares Reproduction Biology Unit, INTA, University of Chile, Santiago, ChileSearch for more papers by this authorAlfredo Torres, Alfredo Torres Fish Culture Center, IFOP, Coyhaique, ChileSearch for more papers by this author Francisco Estay, Francisco Estay Faculty of Sciences, University of Chile, Santiago, ChileSearch for more papers by this authorRoberto Neira, Roberto Neira Faculty of Agricultural and Forestry Sciences, University of Chile, Santiago, ChileSearch for more papers by this authorNelson F. Diaz, Corresponding Author Nelson F. Diaz [email protected] Faculty of Sciences, University of Chile, Santiago, ChileUniversity of Chile, Dept. of Ecological Sciences, Casilla 653, Santiago, Chile===Search for more papers by this authorLuis Valladares, Luis Valladares Reproduction Biology Unit, INTA, University of Chile, Santiago, ChileSearch for more papers by this authorAlfredo Torres, Alfredo Torres Fish Culture Center, IFOP, Coyhaique, ChileSearch for more papers by this author First published: 07 December 1998 https://doi.org/10.1002/(SICI)1097-010X(19980415)280:6 3.0.CO;2-PCitations: 21AboutPDF 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 Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract The gametogenesis of a 2-year-old coho salmon broodstock population cultured in a fish farm in southern Chile was studied. Gonadosomatic index (GSI), microscopic gonadal traits, and serum levels of estradiol-17β(E2), testosterone, and 17α,20β-dihydroxy-4-pregnene-3-one (17,20P) in both sexes were recorded beginning 9 months before spawning in bimonthly samplings. Maximum GSI means were reached during May, the month of spawning, with 16.8 ± 4.1% for females and 8.4 ± 0.8% for males, both values within the range described in the literature. GSI in males, however, was triple that of females during January, showing a faster rate of gonadal growth in males in early summer. Gonadal microscopy for both sexes showed stages corresponding to those described by different authors for other salmonids such as rainbow trout. The secondary vitellogenesis period was 4 to 5 months and corresponded with the short vitellogenesis model described in rainbow trout for broodstocks maturing at 2 years of age. The serum profiles of sex steroids in both sexes are consistent with those described in coho salmon and other salmonid species. In females, E2 and 17,20P show opposite profiles, reaching their maximum levels (E2: 45.13 ± 11.3 ng/ml; 17,20P: 24.47 ± 7.34 ng/ml) during vitellogenesis (March) and ovulation (May), respectively. In both sexes, testosterone concentration shows maximum levels in May (females: 61.68 ± 15.75 ng/ml; males: 107.8 ± 11.6 ng/ml), suggesting the physiological importance of this hormone during maturation, either directly or as a substrate for the synthesis of other hormones. In males, the maximum level of 17,20P (22.33 ± 4.5 ng/ml) also occurs in May during total spermiation, which confirms its role in semen production and semen fluid regulation as described in the literature about this hormone in salmonid males. On the basis of the data obtained, a reproductive pattern is proposed for 2-year-old salmon cultured in southern Chile. J. Exp. Zool. 280:429–438, 1998. © 1998 Wiley-Liss, Inc. Citing Literature Volume280, Issue615 April 1998Pages 429-438 RelatedInformation