Study on the tolerance of Hemifusus tuba juvenile to nitrite

Under the water temperature of 29 ℃, we studied the tolerance of Hemifusus tuba juvenile at shell height (11.30.11) mm to nitrite at different pH and salinity. The result shows that the toxicity of nitrite to H.tuba juveniles is greater when pH and salinity are lower. When pH is 6.7, 7.3, 8.0 and 8.8, the 96 h LC50 of nitrite with 95% confidence limit to the juveniles is 188 mgL-1(167~213 mgL-1), 213 mgL-1(195~231 mgL-1), 254 mgL-1(231~271 mgL-1) and 304 mgL-1 (284~321 mgL-1); correspondingly, the safe concentration (SC) of nitrite to the juveniles is 18.8 mgL-1, 21.3 mgL-1, 25.4 mgL-1 and 30.4 mgL-1, respectively; SC at pH 8.8 is 1.6 times that at pH 6.7. The 96 h LC50 with 95% confidence limit of nitrite to juveniles is 151 mgL-1(138~178 mgL-1), 171 mgL-1(159~192 mgL-1), 265 mgL-1 (246～282 mgL-1) and 296 mg.L-1 (278~323 mg.L-1) when salinity is 16, 19, 23 and 28; correspondingly, the SC is 15.1 mgL-1, 17.1 mgL-1, 26.5 mgL-1 and 29.6 mg.L-1, respectively; SC at the salinity of 28 is nearly 2 times that of 16.