硝化细菌是一种在水产养殖中应用较为普遍的微生态制剂,对于养殖水体水质净化至关重要。同时各种微生物制剂的应用对自然环境所造成的安全性影响也十分值得研究和关注。本研究选择多刺裸腹溞作为受试物,研究不同浓度硝化细菌菌剂对受试物24 h、48 h急性毒性。结果表明,24 h LC50为1.15×1025mg/L、48 h LC50为1.00×1022mg/L,说明硝化细菌菌剂对水溞的急性毒性影响较小。 相似文献
ABSTRACT: The attracting effect of a small dose of tetrodotoxin (TTX) on eight toxic snail species ( Polinices didyma, Natica lineata, Natica vitellus, Zeuxis sufflatus, Niotha clathrata, Oliva miniacea, Oliva mustelina and Oliva hirasei ) and two non-toxic species ( Pomacea canaliculata and Satsuma bairdi ) was investigated. Each toxic snail species was determined to contain TTX. The minimum lethal dose of TTX for most toxic snails was estimated to be >44.5 µg TTX/20 g body weight, but for non-toxic snails it was <3.6 µg TTX/20 g body weight. After the attracting test, it was found that for all toxic snails there was a significantly positive relationship between the comparative attracting variation and the toxicity reported, and this relationship was linear ( y = 5.895 x + 3.443, r = 0.806). The relationship between TTX resistance ability and toxicity also had a positive correlation ( y = 0.113 x + 52.447, r = 0.814). However, non-toxic species showed a negative response. The more toxic snails appeared to prefer TTX, indicating that TTX is an attractant for toxic snails. 相似文献