Analysis of changes in biochemical composition in the body of juvenile Portunus trituberculatus during overwintering (Brachyura, Portunidae)

What is it about?

This study analysed the composition and content of nutrients in the muscle and hepatopancreas of juvenile Portunus trituberculatus cultured in a pond at the beginning, middle and end of overwintering, so as to understand the nutrient metabolic patterns in the body of P. trituberculatus during overwintering. The results showed that the muscle index of P. trituberculatus changed little during overwintering, but the hepatopancreas index showed a significant downwards trend . The total carbohydrate, crude lipid and crude protein in the muscle and hepatopancreas of juvenile P. trituberculatus decreased to different degrees throughout the overwintering period. ΣSFAs in the muscle of juvenile P. trituberculatus showed a slightly decreasing trend, ΣMUFAs showed a slightly increasing trend, while ΣPUFAs remained basically unchanged. In contrast, the content of fatty acids in the hepatopancreas changed greatly, and the total saturated fatty acids showed a significant trend of continuous decrease.The MUFAs decreased slightly in the late stage of overwintering. In general, the energy material of juvenile P. trituberculatus was mainly derived from the hepatopancreas throughout the overwintering period, and it mainly utilized carbohydrates and crude lipids in the body and was highly selective in the oxidative utilization of fatty acids, mainly utilizing SFAs for oxidative energy supply, while PUFAs, HUFAs, EPA and DHA were selectively retained.

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