Comparative Performance of Mixed-Sex and Hormonal-Sex-Reversed Nile Tilapia Oreochromis Niloticus and Hybrids (Oreochromis Niloticus × Oreochromis Urolepis Hornorum) Cultured in Concrete Tanks

Simple item page
dc.creatorMbiru, Moses
dc.creatorSamwel Mchele Limbu
dc.creatorChenyambuga, Sebastian W.
dc.creatorLamtane, Hieromin A.
dc.creatorTamatamah, Rashid
dc.creatorMadalla, Nazael A.
dc.creatorMwandya, Augustine W.
dc.date2016-06-26T17:14:39Z
dc.date2016-06-26T17:14:39Z
dc.date2016
dc.descriptionUncontrolled breeding and precocious maturity in Nile tilapia, Oreochromis niloticus can be avoided by using all-male population. This study compared the growth performance, survival rate, condition factor and final fish tank biomass (yield) of mixed-sex and hormonal-sex-reversed O. niloticus and hybrids (O. niloticus × O. urolepis hornorum) cultured in tanks. Sex-reversed males were produced by feeding newly hatched fry with a diet containing 60 mg of 17α-methyltestosterone for 28 days. Fourteen O. niloticus with initial mean weight (±standard error) of 0.50 ± 0.04, 0.48 ± 0.06 and 0.46 ± 0.01 g for mixed-sex, sex-reversed and hybrids, respectively, were separately stocked in triplicate tanks at a density of two fish m−2 and fed a 300 g kg−1 crude protein diet for 12 weeks. Results showed that hybrids had significantly higher final mean weight (31.41 ± 0.33 g) than hormonal-sex-reversed (25.82 ± 1.51 g) and mixed-sex O. niloticus (19.50 ± 1.26 g; p < 0.05). Similarly, sex-reversed O. niloticus had significantly higher final mean weight than mixed-sex (p < 0.05). The condition factor of hybrids (1.71 ± 0.05) was significantly higher than that of sex-reversed (1.46 ± 0.01; p = 0.001) and mixed-sex O. niloticus (1.43 ± 0.01; p = 0.001). Survival rate was not significantly different among treatments (p = 0.445). The final fish tank biomass was significantly higher in hybrids (535.24 ± 31.67 g tank−1) and hormonal-sex-reversed (486.52 ± 33.70 g tank−1) than mixed-sex O. niloticus (330.05 ± 17.08 g tank−1; p < 0.05). This study demonstrates that hybrids have superior growth performance and condition factor than sex-reversed and mixed-sex but have similar yields to hormonal-sex-reversed O. niloticus. These results suggest that O. niloticus farmers can improve growth rate and yield by rearing hybrids without affecting survival rate.
dc.identifierMbiru, M., Limbu, S.M., Chenyambuga, S.W., Lamtane, H.A., Tamatamah, R., Madalla, N.A. and Mwandya, A.W., 2016. Comparative performance of mixed-sex and hormonal-sex-reversed Nile tilapia Oreochromis niloticus and hybrids (Oreochromis niloticus× Oreochromis urolepis hornorum) cultured in concrete tanks. Aquaculture International, 24(2), pp.557-566.
dc.identifier0967-6120
dc.identifierhttp://hdl.handle.net/20.500.11810/2725
dc.identifier10.1007/s10499-015-9946-z
dc.languageen
dc.publisherSpringer Link
dc.subjectAll-male tilapia
dc.subjectPrecocious maturity
dc.subjectHeterosis
dc.subjectAndrogenic effect
dc.subjectAnabolic effect
dc.titleComparative Performance of Mixed-Sex and Hormonal-Sex-Reversed Nile Tilapia Oreochromis Niloticus and Hybrids (Oreochromis Niloticus × Oreochromis Urolepis Hornorum) Cultured in Concrete Tanks
dc.typeJournal Article, Peer Reviewed

Files

Collections

Department of Aquatic Sciences and Fisheries Technology