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Survival, growth and physiology of the juvenile razor clam (
 Sinonovacula constricta
 ) under Na
 +
 /K
 +
 ratio stress

In this study, we investigated the response of the Chinese razor clam (Sinonovacula constricta) under the Na⁺/K⁺ ratio in inland saline water. Acute and long‐term (30 days) stresses were studied to better delineate the process of the effect. At the end of the test, only the groups of Na⁺/K⁺ ratio from 21.28 to 159.95 contained surviving Juvenile S. constricta, and the Na⁺/K⁺ ratio 31.91 and 47.27 groups showed significantly higher survival rates (p < .001). In test groups of Na⁺/K⁺ ratio, the growth rate (shell length growth rate and weight gain rate) was significantly lower under than that the control group (p < .05 and p < .001 for length and weight). The Na⁺/K⁺‐ATPase activities in the test Na⁺/K⁺ ratio groups (R3, R5, R6, R7 and R8) were significantly higher than that in the control group during 30 days (p < .05). The superoxide dismutase activity in the higher Na⁺/K⁺ ratio groups (R7 and R8) was significantly higher than that in the control group during 30 days. However, in the test groups, the aspartate aminotransferase (R3, R6, R7 and R8), acetylcholinesterase (R3, R7 and R8) and lysozyme (R7 and R8) activities were lower than that control group during 30 days. Under ultrahigh and ultralow Na⁺/K⁺ ratio acute stress, the oxygen consumption rate, phagocytosis rate and metabolic activity fluctuated significantly. Unbalances of Na⁺/K⁺ ratio may affect ion regulation, metabolism, immunity and neuromodulation. Juvenile S. constricta adapted to a range of Na⁺/K⁺ ratios and keep to growth. This suggested the possibility of breeding S. constricta to resist inland saline water.