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

机译：盐度对中华绒螯蟹成年雄性中华绒螯蟹性腺发育渗透调节和代谢的影响

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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 Mg2+ 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.
机译：盐度作为一个ad游物种，是影响中华绒螯蟹中华绒螯蟹生殖繁殖过程中性腺发育的关键参数。然而，目前尚不清楚盐度对雄性中华绒螯蟹性腺发育的影响，以及它们在生殖迁徙过程中对盐度的生理反应。本研究调查了四种盐度（0‰，6‰，12‰和18‰）对成年雄性中华绒螯蟹在40天内的性腺发育，渗透调节和代谢的影响。结果表明，提高盐度可促进性腺发育，增加血淋巴重量摩尔渗透压浓度和K + 和Mg 2 + 的浓度（P <0.05）。盐度为12‰时，血淋巴中的牛磺酸和精氨酸含量最高，而0‰处理时苏氨酸，苯丙氨酸，赖氨酸，β-丙氨酸，色氨酸，鸟氨酸和总游离氨基酸的含量最高（P <0.05） 。盐度后g中Na + / K + -ATPase活性及其mRNA表达水平均呈下降趋势（P <0.05）。随着盐度的增加，前g中的总饱和脂肪酸减少（P <0.05）； 0‰处理后terior中的总多不饱和脂肪酸最高，而总n-6多不饱和脂肪酸随盐度增加（P <0.05）。血淋巴中的葡萄糖和尿酸随着盐度的增加呈下降趋势，而血淋巴中的甘油三酸酯和高密度脂蛋白胆固醇则呈上升趋势（P <0.05）。 12‰处理的血淋巴丙二醛和肝胰脏γ-谷氨酰转肽酶水平最高（P <0.05）。总之，这些结果表明微咸水促进了雄性中华绒螯蟹的性腺发育，并增加了血淋巴的渗透压和离子浓度，同时降低了Na + / K +

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