Acclimatization, survival and growth. Rates of Pangani tilapia (oreochromis pangani) in different salinities.
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Date
2011
Authors
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Publisher
University of Dar es Salaam
Abstract
Coastal communities depend on fisheries activities as their main source of income. With the fast
rising coastal population and technological advancement, pressure on the wild marine resources is
increasing leading to overexploitation. Aquaculture sees as a possible livelihood alternative that
will provide the coastal people with an alternative source of income. Some species of tilapia are
known to survive and grow in estuarine and marine environment. The aim of this study is to
determine the Acclimatization survival and growth of Oreacbromis pangani in four different
salinities. Pangani species was collected from Pangani River and acclimatized for 17 days by
raising the salinity by 2 PPt /day. The fingerlings weighing between 1 .3g-3 1 .4g were cultured at
0, 15, 25 and 35 ppt in 1 m 3 concrete ponds. Environmental parameters in the ponds were
monitored once a day. Water exchange was done at 15% per day throughout the experiment while
fecal matter, feeds remains were removed weekly by flushing. The mean growth rates per week
were 2.25 ± 2.0 g, 2.77 ± 1.55 g, 2.34 ±1.38 g, and 1.86 g ± 0.16 at salinity level of 0, 15, 25, 35
ppt respectively. The growth rates were not statistically different among salinity levels (1-
ANOVA, F =1.129, DF = 55, P > 0.05). Also from one way ANOVA results shows that, there was
no significance difference in growth rates between treatments ponds and control ponds for 0, 15
and 25 ppt. However, at 35 ppt stress had impact on growth rate (t, 8.85, P= 0.006). Nevertheless,
the results of the study have shown O. pangani to grow better on salinity level of 15. The overall
survival rate was 96.46% and that of the different salinities were 100,95,95 and 90 for O, 15, 25
and 35 ppt respectively.
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Keywords
Acclimatization,, growth., survival, Pangani, tilapia, (oreochromis, salinities.
Citation
Hassan, A.(2011) Acclimatization, survival and growth. Rates of Pangani tilapia (oreochromis pangani) in different salinities.. Master dissertation, University of Dar es salaam. Dar es Salaam.