Abstract
Two freshwater species of clupeids ( Pellonula afzeliusi and Sierrathrisa leonensis) found in Kainji Lake, Nigeria, were analyzed to assess their nutritive constituents. The effects of sundrying (the only processing method in the Kainji Lake basin) on the nutrient composition and lipid characteristics of these species were also studied. Proximate analysis showed that fresh samples of Sierrathrisa leonensis and Pellonula afzeliusi have crude protein levels of 14·1 ± 1·0% and 16·0 ± 1·1%, respectively. Sundried samples of S. leonensis contained 62·1 ± 3·2% protein, 11·0 ± 1·0% lipid and 1·6 ± 0·2% ash, while P. afzeliusi contained 57·3 ± 2·3% protein, 14·1 ± 0·9% lipid and 2·4 ± 0·8% ash. The effect of sundrying was monitored on the extracted lipids of both species. Lipid characteristics, such as iodine value, peroxide value, lipid class composition analysis and fatty acid analysis (by GLC) showed that the lipids underwent lipolysis and autoxidation through sundrying. The analysis calls for a more efficient drying method so that the clupeids could be effectively utilized as sources of protein and good edible fish oil.
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