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| Acute Toxicity of Mn2+ to Larval Sea Cucumber Apostichpus japonicus |
| LI Ao,LIU Peng,JIANG Yu-sheng,HAN Yu,LEI Yan-zhi,LIU Xu |
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Abstract Acute toxicity of Mn2+ to pentactula, and juvenile sea cucumber Apostichopus japonicus was studied using a probabilistic method and using“coma and death” as an indicator. The coma median effect concentration (EC50 ) of Mn2+ to pentactula was found to be 220. 5 mg/L for 24h, 197. 8 mg/L for 48h and 173. 7 mg/L for 96 h, with safe concentration (SC) of 47. 8 mg/L ;the lethal EC50 of Mn2+ to pentactula was 207. 6 for 48h and 177. 3 mg/L for 96 h. The coma EC50 of Mn2+ to juveniles was 148. 6 mg/L for 24h, 112. 6 mg/L for 48h and 105. 9 mg/L for 96 h, with SC of 19. 4 mg/L ;the lethal EC50 of Mn2+ to ju‐veniles was 189. 4 for 24h, 125. 9 for 48h and 105. 9 mg/L for 96 h, with SC of 16. 7 mg/L. The coma EC50 of Mn2+ to large juveniles was 315. 4 for 24h, 253. 3 for 48h and 149. 0 mg/L for 96 h, with SC of 49. 0 mg/L ;the lethal EC50 of Mn2+ to large juveniles was 250. 7 for 48h and 149. 0 mg/L for 96 h. The pentactula and large juvenile sea cucumber had stronger tolerance of M n 2+ than juveniles did.
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Received: 25 December 2014
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