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Comparison of Nutrients and Volatile Substances in Muscles between Cultured and Wild Mullet Liza haematocheila |
LI Min, HU Gaoyu, TENG Shuangshuang, HUANG Xiaolin, ZHANG Xiang, XIAO Guoqiang |
Zhejiang Mariculture Research Institute, Zhejiang Key Lab of Exploitation and Preservation of Coastal Bio-Resource, Wenzhou 325005, China |
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Abstract In order to explore the difference in nutritional and volatile components of cultured and wild marine fish, the proximate nutrient composition, amino acid compositions, fatty acid compositions, and volatile components of the muscles were measured and analyzed between raceway aquaculture system and wild mullet Liza haematocheila. The results showed that there was significantly lower muscular water content in raceway cultured fish than that in wild fish (P<0.05), and significantly higher crude fat content was than that in the wild(P<0.05), without significant differences in ash and crude protein content (P>0.05). The content of most amino acids in the muscle in raceway aquaculture system was significantly higher than that in the wild (P<0.05), while the essential amino acids, non-essential amino acids and total amino acids were significantly different (P<0.05). The amino acid score and chemical score indicated that the first limiting amino acid in mullet muscle was methionine+cystine, and the second limiting amino acid was valine. The raceway aquacultured mullet had higher essential amino acid index(101.39) than the fish in the wild(82.79) did. The farmed mullet had significantly higher unsaturated fatty acid content and fatty acid unsaturation degree than the wild fish did (P<0.05). While the content of saturated fatty acids and eicosapentaenoic acid+docosahexenoic acid were lower in the raceway cultured mullet than those in the wild (P<0.05). 18 and 29 volatile compounds were detected in the fish in the raceway aquaculture system and wild, respectively. There were more types and quantities of key flavor substances in the muscle of wild mullet. While mullet cultivated in in-pond raceway aquaculture system led to reduce some of the volatile compounds which presented unpleasant odor compound content. The findings showed that mullet cultivated in the raceway aquaculture system improved the amino acid and volatile compound composition.
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Received: 25 May 2022
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