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dc.contributor.authorRomana-Eguia, Maria Rowena R.
dc.contributor.authorIkeda, Minoru
dc.contributor.authorBasiao, Zubaida U.
dc.contributor.authorTaniguchi, Nobuhiko
dc.date.accessioned2014-05-13T07:02:47Z
dc.date.available2014-05-13T07:02:47Z
dc.date.issued2005
dc.identifier.citationRomana-Eguia, M. R. R., Ikeda, M., Basiao, Z. U., & Taniguchi, N. (2005). Genetic changes during mass selection for growth in Nile tilapia, Oreochromis niloticus (L.), assessed by microsatellites. Aquaculture Research, 36(1), 69-78.en
dc.identifier.issn1355-557X
dc.identifier.urihttp://hdl.handle.net/10862/2039
dc.description.abstractTwo control (C1 or first control generation, and C4 or fourth control generation) and three selected (S1 or first selected generation, S2 or second selected generation, S4 or fourth selected generation) stocks of Chitralada Nile tilapia were analysed for microsatellite variation to determine the effect of size-specific mass selection on genetic variability. Genetic variation based on five microsatellite loci (UNH123, UNH147, UNH172, UNH222 and UNH216) showed a slightly higher allelic diversity in the selected stocks (7.4–10 alleles) than in the control stocks (6.8–8.8 alleles). Apparent reductions in the mean number of alleles and He values were noted in successive generations of both control and selected lines. Significant deviations from Hardy–Weinberg equilibrium because of an excess of homozygotes indicated inbreeding in all control and selected stocks. Although estimated inbreeding levels were not significantly different among selected and control lines based on Welch's t-tests, the increase in the degree of inbreeding within the selected line was higher (107.9%) than the control line (64.2%) after four generations. The implications of these results on the management and conservation of genetic diversity in improved breeds are discussed, while the importance of monitoring and minimizing inbreeding are likewise emphasized.en
dc.description.sponsorshipThe authors would like to thank Ms. Adelaida L Arago, Messrs. Bienvenido Banaag and Federico Reyes for their technical assistance. The Japan Society for the Promotion of Science (JSPS) and SEAFDEC are gratefully acknowledged for funding this study.en
dc.language.isoenen
dc.publisherBlackwell Publishingen
dc.subjectOreochromis niloticusen
dc.subjectmass selectionen
dc.subjectNile tilapiaen
dc.titleGenetic changes during mass selection for growth in Nile tilapia, Oreochromis niloticus (L.), assessed by microsatellitesen
dc.typeArticleen
dc.citation.volume36
dc.citation.issue1
dc.citation.spage69
dc.citation.epage78
dc.citation.journalTitleAquaculture Researchen
dc.subject.asfaallelesen
dc.subject.asfabody sizeen
dc.subject.asfamicrosatellitesen
dc.subject.asfabrackishwater fishesen
dc.subject.asfaculture effectsen
dc.subject.asfagenetic variationen
dc.subject.asfagrowth rateen
dc.subject.asfainbreedingen
dc.subject.asfapopulation geneticsen
dc.subject.asfaselective breedingen
dc.identifier.essn1365-2109
dc.identifier.doi10.1111/j.1365-2109.2004.01185.x


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