Hybrids production as a potential method to control prolific breeding in tilapia and adaptation to aquaculture climate-induced drought

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dc.contributor.authorKulwa Mtaki
dc.contributor.authorSamwel Mchele Limbu
dc.contributor.authorAviti John Mmochi
dc.contributor.authorMatern S.P. Mtolera
dc.date.accessioned2021-04-26T07:34:02Z
dc.date.available2021-04-26T07:34:02Z
dc.date.issued2021-04-26
dc.description.abstractEstablishing suitable salt tolerant all-male tilapia strains with fast growth rate is a crucial requirement for successful euryhaline farming required for controlling prolific breeding and as an adaptation to the effect of climate-induced drought. This study assessed the percentage of tilapia male hybrids, their growth performance and survival rate produced by crossing female Nile tilapia (Oreochromis niloticus) and male Rufiji tilapia (Oreochromis urolepis urolepis) at different salinities. The fingerlings were reared for 70 days in triplicate concrete tanks (1 m3), each stocked with 15 fish weighing 1.62 ± 0.03 g, 1.69 ± 0.02 g and 1.41 ± 0.06 g exposed to 2, 15 and 35 ppt salinities, respectively. Acclimatization was done by adding seawater to freshwater at a rate of 2 ppt per day for 18 days. Fish sexing was done by visual assessment of the genital papilla followed by rearing the hybrids for six months to observe reproduction. Results showed that, the cross between O. niloticus (female) and O. urolepis urolepis (male) produced hybrids that were all-males without any reproduction within six months post hybridization. The hybrids reared at a salinity of 2 ppt had higher growth performance than those reared at 15 and 35 ppt. Similarly, hybrids cultured at 15 ppt had significantly higher growth performance than those reared at 35 ppt. All the hybrids produced had survival rates of 100%. This study indicated that, all-male tilapia produced by crossing between O. niloticus (female) and O. urolepis (male) can be used by fish farmers as alternative species for mariculture development to control prolific breeding and as an adaptation strategy to climate change.en_US
dc.description.sponsorshipThe Institute of Marine Science (IMS), University of Dar es Salaam through the Swedish International Development Cooperation Agency (Sida) supported Bilateral Marine Sciences Programen_US
dc.identifier.citationKulwa Mtaki, Samwel McheleLimbu, Aviti John Mmochi and Matern S. P. Mtolera (2021). Hybrids production as a potential method to control prolific breeding in tilapia and adaptation to aquaculture climate-induced drought. Aquaculture and Fisheries, https://doi.org/10.1016/j.aaf.2021.04.005.en_US
dc.identifier.doihttps://doi.org/10.1016/j.aaf.2021.04.005.
dc.identifier.urihttp://hdl.handle.net/20.500.11810/5679
dc.publisherElsevieren_US
dc.subjectMonosex cultureen_US
dc.subjectHybridizationen_US
dc.subjectMaricultureen_US
dc.subjectAll-male hybridsen_US
dc.subjectAquaculture climate-induced droughten_US
dc.titleHybrids production as a potential method to control prolific breeding in tilapia and adaptation to aquaculture climate-induced droughten_US
dc.typeJournal Article, Peer Revieweden_US
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