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| Acute Toxicity of Formalin to Chinese Tiger Crab Orithy ia sinica Larvae |
| WANG Lian-yong,CAO Chen,XING Zuo-ping,HAO Yong-fang,SONG Song-wei,KUANG Shao-hua |
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Abstract T he acute toxicity of formalin to different developmental larvae of Chinese tiger crab Orithy ia sinica was studied at water temperature of 25-26 ℃ and a salinity of 22 .The results showed that the larvae had change in the tolerance capacity to formalin with developmental stage .The value of median lethal concentrations (LC50 ) in 24h was found to be ranged as M (megalopa) >Zoea Ⅲ(Z3 ) >ZoeaⅡ(Z2 )>ZoeaⅠ(Z1 ) .In 36 h ,however ,the order of the LC50 value was ranged as M > Z2 > Z3 > Z1 .The LC50 of formalin for 48 h was found to be 97 .323 mg/L in Z1 ,163 .024 mg/L in Z2 ,122 .599 mg/L in Z3 ,and 168 .388 mg/L in M ,with the safe concentration of 3 .584 mg/L in Z1 ,8 .904 mg/L in Z2 ,4 .533 mg/L in Z3 ,and 9 .691 mg/L in M .It is suggested that the safe concentration (3 .584 mg/L ) of Z1 to formalin be the safe concentration during w hole larva breeding of Chinese tiger crab .
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Received: 25 April 2014
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