Browsing by Author "Komba, Emma A"
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Item Comparative evaluation of water quality parameters and growth performance of sex-reversed Nile tilapia (Oreochromis niloticus) raised in two different climatic conditions in Tanzania(2020-06) Komba, Emma A; Munubi, Renalda N; Chenyambuga, Sebastian WA study was done to compare water quality parameters, growth and production performance of Sexreversed Nile tilapia (Oreochromis niloticus) cultured in two districts of Tanzania, which experience different climatic conditions (cold and moderately warm). Fingerlings (1.00 g average weight) were stocked in earthen ponds (2 fish/m3), then raised for six months. Fish were fed twice daily and ponds were inorganically fertilized fortnightly. Measurements of water quality parameters and fish growth parameters (weight, length and width) were done biweekly. The results revealed significant differences on various water quality parameters; including temperature, salinity, conductivity and alkalinity between the two districts (p≤0.05). Mean growth rate, specific growth rate, mean final weight, estimated annual yield and Food Conversion Ratio were significant better for fish grown in warm than those in cold climate (p≤0.05). It is concluded that, fish growth and water quality parameters are better in warm than cold condition.Item Comparison of body length-weight relationship and condition factor for Nile tilapia (Oreochromis niloticus) cultured in two different climatic conditions in Tanzania(2020-04) Komba, Emma A; Munubi, Renalda N; Chenyambuga, Sebastian WThis study compared length-weight relationship and condition factor of male Nile tilapia raised in two districts experiencing different climatic conditions in Tanzania, Mbarali and Mufindi. Fish were raised for six (6) months and measurements were done biweekly. The results suggests negative allometric growth pattern (b < 3) for the fish grown in both experimental locations. The “b” values for the lengthweight relationships were 2.87 and 2.94 in Mbarali and Mufindi, respectively. The correlation coefficient and coefficient of determination indicated strong relationship (>99%) between length and weight of the fish. The condition factor (K) ranged from 2.74 to 3.50 in Mbarali and 1.96 to 2.40 in Mufindi, throughout the experimental period. Significantly higher condition factor was observed for fish grown in Mbarali (3.168 ± 0.056) than those in Mufindi (2.166 ± 0.056). It is concluded that, the climate of Mbarali provides better conditions for growth of fish than that of Mufindi.