Effects of feed on fatty acid composition in muscles and gonads of the Chinese mitten crab (Eriocheir sinensis)

In this study, the effects of different feeds on fatty acid composition in the Chinese mitten crab (Eriocheir sinensis) were investigated. The fatty acid composition in the Chinese mitten crab was significantly correlated with the type of feed source provided. Differences between the feed groups pertained mainly five fatty acids: oleic acid, linoleic acid, palmitic acid, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). The content of EPA and DHA was higher in the group of frozen trash fish than in the group of formulated feed. On the other hand, the content of oleic acid, linoleic acid and palmitic acid was higher in the formulated feed group than in the frozen trash fish group. There were significant differences in the nutritional value of the Chinese mitten crab reared under different feed sources, i.e. Chinese mitten crabs reared with the frozen trash fish feed were larger than those reared with the formulated feed, especially as regards the ω-3/ω-6 PUFA ratio and essential fatty acid levels.

Conclusion

The Chinese mitten crab is a high-quality aquatic product of China, ranking as an important product in China’s aquaculture industry. The content of ω-3 PUFAs, such as EPA and DHA, is higher in crabs receiving frozen trash fish than in crabs from the formulated feed group. Fatty acids in crabs are significantly correlated with the feed composition. The oleic acid, linoleic acid, palmitic acid, EPA, and DHA are mainly affected by substituting trash fish feed for formulated feed, these fatty acids, to a certain extent, represent the nutritional value of Chinese mitten crabs. Compared with the frozen trash fish feed group, the level of the aforementioned fatty acids in the formulated feed group could reach a similar level by adding exogenous ω-3 PUFA to the formula. Thus, further research to improve the formula can significantly contribute to the promotion of environmentally friendly aquaculture.

Acknowledgements

This work was supported by the Central Public-Interest Scientific Institution Basal Research Fund, the Freshwater Fisheries Research Center, CAFS (No. 2019JBFZ04) and the Project of Fishery Science and Technology in the Jiangsu province (D2018-04).

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