Aquaculture sector if fully exploited has great potential of boosting foreign exchange, household nutritional and income levels. However, not much has been done regarding economic analysis of aquaculture production to attract and guide investment. This study was carried out to assess the profitability and viability of the aquaculture enterprises in central Uganda. The study focused on the socioeconomic and production characteristics, profitability indices and significant challenges experienced by the fish farmers. The fish farmers were selected using simple random and purposive Original Research Article
Locally available nutrient materials (Cow dung, Soybean extracts and Diammonium Phosphate (DAP)/UREA) were used to prepare culture media for growing Chlorella spp. and compared to the commonly constituted Bold's Basal Medium (BBM) as a control. Algae was cultured in 25L rectangular glass tanks with 24 hour illumination and aeration. Ammonia, pH and counts of algae cells/ml were recorded daily for 24 days. Chlorella spp. production rate, effect of intrinsic ammonia and pH on culture performance, duration of culture cycle and the di fferences in resultant fatty acid composition of the algae were tested. Results indicated a significant effect of culture media on the growth performance of Chlorella spp. (F = 3.42, P< 0.05), although the interaction between time (day) and nutrient media was also significant (F = 17.27, P< 0.05). Bold's Basal Media had significantly lower mean abundance of Chlorella spp. per millilitre than all the other media (F = 20.65, 13.57±7.1×10 4 , P< 0.05). However, Soybean media supported significantly higher densities of Chlorella spp. than other media (F = 20.65, 20.65, 21.53±7.4×10 4 , P< 0.05). The abundance of Chlorella in DAP/UREA and Cow dung media did not differ significantly (F = 20.65, 17.01×10 4 ±4.3 and 18.43±6.0×10 4 , P = 0.46 respectively). There was a notable positive effect of pH on growth of Chlorella whereas ammonia did not have much impact even at relatively high concentrations (236.095 mg l -1 in DAP/UREA). Of the fatty acids in Chlorella, polyunsaturated fatty acids (>40% of Total Fatty Acids) were predominant in all media. Monounsaturated fatty acids (MUFAs) were recorded low (<5% TFA) for Cow dung, BBM and Soybean. DAP/UREA was superior for MUFAs and HUFAs. The results from this study demonstrated the feasibility of cultivating Chlorella spp. using locally prepared nutrients.
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