Browsing by Author "Moses, Mbiru"

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    A comparative study on growth performance of all male tilapia produced from crossing oreochromis niloticus and oreochromis urolepis hornorum and hormonal sex reversed oreochromis niloticus cultured in concrete tanks
    (University of Dar es Salaam, 2015) Moses, Mbiru
    A study aimed at determining growth performances and yields from all male tilapia obtained from an alternate sex crossing (O. niloticus x O. urolepis hornorum) and with 17α-methyltestosterone (MT) (O. niloticus) administration was conducted at Magadu Farm, Aquaculture Research Facilities, Sokoine University of Agriculture in Tanzania. Nine rectangular concrete tanks of 7 m2 each were used in this study. A total of 126 fingerlings stocked at 2 fish/m2 were reared in three treatments which were replicated three times, making a total of nine replicates. The treatments were: mixed sex, sex reversed tilapia, and hybrid tilapia. There was no significant differences in sex proportion between the two methods of producing all males fingerlings ( = 1.860, d.f = 1, P = 0.173). Growth performance was significantly different among the three treatments (ANOVA, P <0.05). Turkey test showed higher growth performance in T3 than T2 and T1 (P<0.05). Similarly, there were significant differences in yield among the treatments (ANOVA, P< 0.05) with the highest gross yield from hybrids (542.30 ± 50.46 kg ha-1year-1) followed by sex reversed tilapias (495.40 ± 53.66 kg ha-1 year-1). The current study revealed that, hybridization is an ideal method for tilapia monosex production compared to sex reversal. It is recommended that further research using on-farm conditions is required before transferring this technology to farmers.