Abstract
The Chinese mitten crab (Eriocheir sinensis) is an euryhaline crustacean, whose adults migrate downstream to estuaries for reproduction. Lipids are believed to be involved in salinity adaptation during migration. This study investigated the effects of different salinities (0, 6, 12, and 18‰) on the total lipids, neutral lipids, and polar lipids contents, and fatty acid profiles in the gonads, hepatopancreas, and muscles of adult E. sinensis after 40 days of salinity adaptation. The results showed that the males and females from 12‰ treatment had the highest contents of total lipids and neutral lipids in their hepatopancreas and total lipids in the muscles. Notably, salinity had a greater effect on the fatty acid profiles in the hepatopancreas compared to that in the gonads and muscles. The male hepatopancreas treated with 18‰ salinity had the highest percentage of total n-6 polyunsaturated fatty acid (∑n-6PUFA) in both neutral lipids and polar lipids, while the percentage of total n-3 polyunsaturated fatty acid (∑n-3PUFA) in neutral lipids and polar lipids decreased significantly with increasing salinity in males. In females, the 0‰ treatment had the highest percentages of total saturated fatty acids in neutral lipids and polar lipids in the hepatopancreas, while the highest ∑n-3PUFA and ∑n-6PUFA in neutral lipids and polar lipids were detected in the 12‰ treatment group. In conclusion, brackish water could promote the accumulations of total lipids and neutral lipids in the hepatopancreas and change the fatty acid profiles of adult E. sinensis, particularly in the hepatopancreas after long-term salinity adaptation.
Highlights
The Chinese mitten crab (Eriocheir sinensis) is an euryhaline crustacean that is mainly distributed along the Eastern coast of Asia to the Korean Peninsula [1, 2]
There were no significant differences in the contents of total lipids, neutral lipids, and polar lipids, as well as the neutral lipids-polar lipids ratio (NL:PL), in the gonads of males among all treatments (P > 0.05, Table 1)
The highest contents of total lipids and neutral lipids in the hepatopancreas of male crabs were detected in the 12‰ treatment group (P < 0.05), while no significant differences were found for the contents of polar lipids and NL:PL among all treatments (P > 0.05)
Summary
The Chinese mitten crab (Eriocheir sinensis) is an euryhaline crustacean that is mainly distributed along the Eastern coast of Asia to the Korean Peninsula [1, 2]. The crab has spread to the coastal ecosystems of Europe and America; it is considered an invasive species [3, 4]. A1-2801-18-1003) from Shanghai Education Commission to YXC, the project (A1-2041-180003) of Shanghai Collaborative Innovation Center for Aquatic Animal Genetics and Breeding to YXC
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