Differences in sexual size dimorphism among farmed tilapia species and strains undergoing genetic improvement for body weight

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cg.authorship.typesCGIAR and developing country instituteen_US
cg.authorship.typesCGIAR and advanced research instituteen_US
cg.contributor.affiliationWorldFishen_US
cg.contributor.affiliationAquaculture Research and Development Center, Ghanaen_US
cg.contributor.affiliationNational Prawn Fry Production and Research Center, Malaysiaen_US
cg.contributor.affiliationAgricultural Research Organization, Israelen_US
cg.contributor.affiliationUniversity of Malawien_US
cg.contributor.affiliationFish Culture Research Station, Israelen_US
cg.contributor.crpLivestock and Fishen_US
cg.howPublishedFormally Publisheden_US
cg.identifier.doihttps://doi.org/10.1016/j.aqrep.2015.03.003en_US
cg.isijournalISI Journalen_US
cg.issn2352-5134en_US
cg.journalAquaculture Reportsen_US
cg.reviewStatusPeer Reviewen_US
cg.subject.ilriANIMAL BREEDINGen_US
cg.subject.ilriFISHen_US
cg.subject.ilriGENETICSen_US
cg.subject.ilriRESEARCHen_US
cg.volume1en_US
dc.contributor.authorLind, C.E.en_US
dc.contributor.authorSafari, A.en_US
dc.contributor.authorAgyakwah, Seth K.en_US
dc.contributor.authorAttipoe, F.Y.K.en_US
dc.contributor.authorEl-Naggar, G.O.en_US
dc.contributor.authorHamzah, A.en_US
dc.contributor.authorHulata, G.en_US
dc.contributor.authorIbrahim, N.A.en_US
dc.contributor.authorKhaw, H.L.en_US
dc.contributor.authorNguyen, N.H.en_US
dc.contributor.authorMaluwa, A.O.en_US
dc.contributor.authorZaid, M.en_US
dc.contributor.authorZak, T.en_US
dc.contributor.authorPonzoni, R.W.en_US
dc.date.accessioned2016-03-10T14:53:13Zen_US
dc.date.available2016-03-10T14:53:13Zen_US
dc.identifier.urihttps://hdl.handle.net/10568/72555en_US
dc.titleDifferences in sexual size dimorphism among farmed tilapia species and strains undergoing genetic improvement for body weighten_US
dcterms.abstractMany tilapia (Oreochromis spp.) farmers produce all-male populations because of the superior growth rate of males compared to females. To investigate differences in body weight at harvest of males and females among different tilapia strains, we analyzed data from 62,787 individuals collected from pedigreed breeding programs of O. niloticus (GIFT from Malaysia, the Abbassa line from Egypt, and the Akosombo line from Ghana), O. shiranus (the Bunda College-Domasi selection line), O. aureus (a selection line under development in Abbassa, Egypt, and a selection line from Israel) and a synthetic selection line of Red tilapia under development in Jitra, Malaysia, derived from stock from Malaysia, Taiwan and Thailand (O. sp.). Mixed models were separately fitted to the data from each selection line. There was a significant sex effect in all strains (P < 0.001). A significant (P < 0.001) sex by generation interaction was observed in all strains (scale effect, not reversal of rankings), except Red tilapia and O. shiranus. Least squares means showed a large range in the magnitude of body weight differences between sexes across the seven strains. The largest percentage difference between females and males was in O. aureus from Egypt (female body weight was 52.2% that of males at harvest), whereas the smallest difference was observed in the GIFT strain of O. niloticus (female body weight 84.7% that of males). Female to male body weight percentages for Red tilapia, O. shiranus, Egypt O. niloticus, Israeli O. aureus and Ghana O. niloticus were 81.3, 81.0, 69.1, 61.7 and 61.0, respectively. We discuss the results in relation to the potential productivity improvements due to superior growth rates of all-male culture compared to mixed-sex culture in tilapia populations differing in the female to male body weight ratio.en_US
dcterms.accessRightsOpen Accessen_US
dcterms.audienceScientistsen_US
dcterms.bibliographicCitationLind, C.E., Safari, A., Agyakwah, S.K., Attipoe, F.Y.K., El-Naggar, G.O., Hamzah, A., Hulata, G., Ibrahim, N.A., Khaw, H.L., Nguyen, N.H., Maluwa, A.O., Zaid, M., Zak, T. and Ponzoni, R.W. 2015. Differences in sexual size dimorphism among farmed tilapia species and strains undergoing genetic improvement for body weight. Aquaculture Reports 1: 20–27en_US
dcterms.extentpp. 20-27en_US
dcterms.issued2015-05en_US
dcterms.languageenen_US
dcterms.licenseCC-BY-NC-ND-4.0en_US
dcterms.publisherElsevieren_US
dcterms.subjectanimal breedingen_US
dcterms.subjectfishesen_US
dcterms.subjectresearchen_US
dcterms.typeJournal Articleen_US

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