Nutritional quality of different grades of adult male chinese mitten crab, Eriocheir sinensis
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This study mainly investigated the composition of adult male Chinese mitten crab (Eriocheir sinensis) from four grades/sizes (Grade I: 200–249 g; Grade II: 175–199 g; Grade III: 150–174 g; Grade IV: ≤ 150 g). The results showed that the grade III crabs had the largest gonadsomatic index (GSI), which was significantly higher than the grade I and grade II crabs, no significant difference was found with the grade IV crab. Significant differences in moisture and total lipid contents were observed among various edible parts from different grades of male Eriocheir sinensis. In particular, grade II crabs had the highest total lipid and dry matter content for hepatopancreas. A balanced amino acids composition and a high essential amino acids score (EAAS) were found in the muscle and gonads of grade III crabs. The levels of poly-unsaturated fatty acids (PUFA), n-3 PUFA, n-6 PUFA and docosahexaenoic acid (DHA) in the hepatopancreas, as well as the contents of PUFA, highly-unsaturated fatty acids (HUFA), n-3 PUFA, arachidonic acid (ARA), and eicosapentaenoic acid (EPA) in the gonads were significantly increased in the grade II crabs. Taken together, it can generally be concluded that adult male Eriocheir sinensis of 150–200 g (Grade II–III) weight have the highest nutritional quality even though they are not the largest crabs.
KeywordsChinese mitten crab Grade/size difference Various edible parts Food composition Nutritional quality
This study was funded by a key extension project (No. 2015-1-7) from Shanghai Agriculture Committee and an R & D project (No.CKZ2015-02) from Science & Technology Committee of Chongming County. Infrastructure costs were supported by the Shanghai Universities First-class Disciplines project of fisheries (2015-62-0908) from Shanghai Municipal Education Committee, and the Capacity Promotion Projects (16DZ2281200, 13DZ2280500) of Shanghai Engineering and Technology Center from Shanghai Municipal Science and Technology Commission the Special Fund (CARS-46) of Chinese Agriculture Research System-47 from Ministry of Agriculture of China.
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