Effect of Freezing on Nutritive Values of Four Fresh Water Fishes of the Blue Nile
Abstract
The study was designed to investigate the effect of freezing on the proximate profile of fishes Synodontis schall, Bagrus bayad , Schilbe uranoscopus and Bagrus docmac. The fishes were subjected to thirty days of frozen period. Protein decreases with freezing; with the fresh samples (not frozen) having the highest protein content (23.53%) for S. uranoscopus, while the least (20.21 %) was recorded for fish samples that were frozen for thirty days for B. bayad. Similar results were obtained for the fat content where the highest fat content (5.48%) was recorded for the fresh samples for S. uranoscopus and the least value was recorded for those stored for thirty days( 1.913% for S. schall). Ash content also decreased during storage. The most affected fish to protein loss during frozen storage was fish B. bayad (20.21%). Frozen storage lead to a loss of nutrient quality in Sudanese fishes during the processing. For minerals the highest values for (Ca),(Na),(K) was obtained in S. uranoscopus for fresh samples, while for frozen samples the least value of (Ca) was in B. docmac,while for (Na) and (K) the least values was in B. bayad.For heavy metals the the highest value for (Pb) was in S. uranoscopus ,for (Fe) the highest value was in B. docmac, for (Zn) the highest value in S. uranoscopus for fresh sample.For frozen samples the highest value for (Pb) was in S. schall, for (Cd) the highest value was in B. bayad, for (Fe) the highest value was in S. schall, for (Zn) the highest value was also in S. schall .
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