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| Edible Yield and Proximate Composition Analysis of Wild Male Adult Mitten Crab, Eriocheir sp. in Northern China |
| ZU Lu1, YU Qiang1, JIANG Xiaodong1, CHENG Yongxu1,2,3, WU Xugan1,2,3 |
1.Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai 201306, China;
2.Shanghai Engineering Research Center of Aquaculture, Shanghai Ocean University, Shanghai 201306, China;
3.National Demonstration Centre for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China |
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Abstract The tissue coefficient, total edible yield (TEY), proximate composition and fatty acid composition of the edible tissues were investigated in wild male adult mitten handed crab, Eriocheir sp with body weight of 80—160 g collected from Suifen River, Tumen River and Liaohe River in October 2017. Results showed that there were significantly differences in gonadosomatic index (GSI), hepatosomatic index (HIS) and meat yield (MY) among the three wild populations (P<0.05), without significant difference in TEY among the three geographical populations (P>0.05). There was the maximal moisture in the gonads, in the Tumen River population, maximal lipid content in the Suifen River population, and the maximal protein and ash content in the Liaohe River population (P<0.05). The crab in the Liaohe River population had significantly higher hepatopancreatic moisture than the other two geographical populations did, and significantly lower ash content than the crab in the other two populations did (P<0.05). There was significantly higher lipid content in the hepatopancreas in the Suifen River population than that in the other two populations (P<0.05). The crab in the Suifen River population had the minimal moisture and the maximal protein, lipid and ash contents in the muscle. The minimal lipid content was observed in the muscle in the crab in the Tumen River population, and the minimal protein and ash contents in muscle tissues was found in the Liaohe River population. There was the maximal total long chain polyunsaturated fatty acid (∑LC-PUFA) content in the testis in the Suifen River population, while there were the minimal ∑LC-PUFA contents in both hepatopancreas and muscle tissues in the Tumen River population (P<0.05). The minimal n-3/n-6 value in edible tissues was found in the Liaohe River population, and the maximal n-3/n-6 value in edible tissues in the Tumen River population. In conclusion, there is no significant difference in the mean TEY of the males among the three wild populations, with significant differences in proximate composition and fatty acid contents in edible tissues among the three different geographical populations.
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Received: 25 June 2019
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