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As a catadromous species, salinity is a key parameter that affects gonadal development of Chinese mitten crab  Eriocheir sinensis  during reproductive migration. It is however unclear the effects of salinity on the gonadal development of male  E .  sinensis  as well as their physiological responses to salinity during reproductive migration. This study investigated the effects of four salinities (0 ‰, 6 ‰, 12 ‰ and 18 ‰) on gonadal development, osmoregulation and metabolism of adult male  E .  sinensis  over a 40-day period. The results showed that elevating salinity promote gonadal development, increase hemolymph osmolality and K +  and Mg 2+  concentrations ( P  < 0.05). The 12 ‰ salinity resulted in the highest contents of taurine and arginine in the hemolymph while the highest contents of threonine, phenylalanine, lysine, ß-alanine, tryptophan, ornithine and total free amino acids were found for 0 ‰ treatment ( P  < 0.05). A decreasing trend was detected for the Na + /K + -ATPase activity and its mRNA expression level in the posterior gills with salinity ( P  < 0.05). Total saturated fatty acids in the anterior gills decreased with increasing salinity ( P  < 0.05); the 0 ‰ treatment had the highest total polyunsaturated fatty acids in the posterior gills while total n-6 polyunsaturated fatty acids increased with salinity ( P  < 0.05). The hemolymph glucose and uric acid showed a decreasing trend as salinity while an increasing trend was found for the hemolymph triglyceride and high-density lipoprotein cholesterol ( P  < 0.05). The 12 ‰ treatment had the highest levels of hemolymph malonaldehyde and hepatopancreatic γ-glutamyltranspeptidase ( P  < 0.05). In conclusion, these results suggested that the brackish water promote gonadal development of male  E .  sinensis , and increase osmolality and ionic concentrations in hemolymph while reduced the activity of Na +  /K + - ATPase and its mRNA expression in the posterior gills as well as metabolism.

Effects of salinity on gonadal development, osmoregulation and metabolism of adult male Chinese mitten crab, Eriocheir sinensis