Survival and growth rates of Pangani River’s tilapia in sea water for mariculture development
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Date
2011
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University of Dar es Salaam
Abstract
The potential for Tilapia zillii and Oreochromis urolepis culture in marinewaters was evaluated by
determination of the survival and growth rates in full strength sea water (FSSW) at 35%o. For the
study fingerlings were collected from Pangani by using seine nets and reared in 1m 3 concrete ponds
where salinity for their growth media was changed to 35%o at the rate of about 2%o per day.
Fingerlings were fed twice daily using commercial fish feeds (White Rose floating type), initially
at a rate of 5% af their total body weight (TBW) and two weeks later at 10% of their TBW. The
growth rate was recorded once a week except for handling control fingerlings which were recorded
at the beginning and at the end of the experiment. The average Height gain (g/week), percentage
weight gain (%/week) and specific growth rate (SGR, %/day) during acclimatization period in
fresh water (FW) and acclimatization saline Hater (SW) in the bracket for O. urolepis urolepis
were found to be 1.06 (2.5), 24.6 (6.98) and 2.86 (0.93) respectively and in T zillii 1.59 (2.30),
19.11 (13.50) and 2.47(1.77) respectively. After acclimatization in freshwater (FW) and full
strength sea water (FSSW) at 35%o (in bracket) for O. urolepis urolepis were found to be 1.88
(1.86), 22.96(4.09) and 2.92(0.58) and for T. zillii 0.66(1.32), 5.09 (5.44) and 0.71 (0.75),
respectively. There was no signifcance difference (p >0.05) in SGR between the two species in
FSSW at 35%o. The survival rates in FW and FSSW at 35%o (in bracket) for O. urolepis urolepis
and T. zillii were 100% (100%) and 89% (96%), respectively. This study shows that if managed
well T. zillii and 0. urolepis urolepis can survive and grow in FSSW at 35%o.
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Keywords
Survival, Pangani, tilapia, mariculture, development
Citation
Nehemia, A.(2011) Survival and growth rates of Pangani River’s tilapia in sea water for mariculture development. Master dissertation, University of Dar es Salaam. Dar es Salaam.