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The 96 h LC50 of nitrite-N to juvenile Macrobrachium rosenbergii was 8.49, 11.21, and 12.87 mg l −1 at 15, 24 and 34 mg Cl − per liter of water, respectively. M. rosenbergii which had been exposed individually to 0 (control), 2, 5, 10 mg nitrite-N per liter for 24 h at 15, 33, 50 mg Cl − per liter were analyzed for hemolymph oxyhemocyanin, protein, acid-base balance, osmolality and ion concentrations. At 15 mg Cl − per liter, hemolymph oxyhemocyanin, protein, hemolymph pH, HCO 3 − , TCO 2 , osmolality, Cl − , Na + , K + and Mg 2+ levels were negatively correlated with external nitrite-N. Hemolymph nitrite-N and PO 2 levels were directly related to nitrite-N, but inversely related to external Cl − . |
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