Show simple item record

dc.creatorLind, C.E. et al.
dc.date.accessioned2018-07-27T16:02:26Z
dc.date.available2018-07-27T16:02:26Z
dc.date.issued2015
dc.identifier3832_2015_Lind_Differences.pdf
dc.identifier.citationAquaculture Reports, 1: 20-27 [open access]
dc.identifier.urihttps://hdl.handle.net/20.500.12348/54
dc.description.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.
dc.formatapplication/pdf
dc.publisherElsevier
dc.sourceAquaculture Reports
dc.titleDifferences in sexual size dimorphism among farmed tilapia species and strains undergoing genetic improvement for body weight
dc.typeJournal Article
dcterms.bibliographicCitationLind, C.E. et al. (2015). Differences in sexual size dimorphism among farmed tilapia species and strains undergoing genetic improvement for body weight. Aquaculture Reports, 1: 20-27
dc.description.versionPeer Review
cg.contributor.projectMore meat, milk, and fish for and by the poor (CRP 3.7)
cg.coverage.countryEgypt
cg.coverage.countryGhana
cg.coverage.countryMalawi
cg.coverage.regionSouth East Asia
cg.coverage.regionWest Africa
cg.description.wfprogramsandthemesSustainable Aquaculture
cg.identifier.worldfish3832
cg.subject.agrovocaquaculture
cg.subject.agrovocgenetics
cg.subject.agrovoctilapia
cg.contributor.affiliationWorldFish
cg.contributor.affiliationAquaculture Research and Development Center
cg.contributor.affiliationWorldFish
cg.contributor.affiliationNational Prawn Fry Production and Research Center (NAPFRE)
cg.contributor.affiliationAgricultural Research Organization
cg.contributor.affiliationUniversity of Malawi
cg.contributor.affiliationFish Culture Research Station Israel
cg.identifier.statusOpen access
cg.identifier.ISIindexedISI indexed
cg.contribution.worldfishauthorLind, C.E.
cg.description.themeSustainable aquaculture


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record