水温和余氯对拟穴青蟹幼蟹的急性毒性研究

doi:10.16378/j.cnki.1003-1111.21131

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Abstract In order to investigate the acute lethal effect of warm drainage in Sanmenwan Nuclear Power Plant on crustacean in the sea area, a 3×12 orthogonal experiment was designed to study the effects of temperature and residual chlorine coupling on the mortality of juvenile Scylla paramamosain by simulating the residual chlorine and temperature rise effect in Sanmenwan Nuclear Power Plant in laboratory. Three different water temperatures ( 25, 30 and 35 ℃), five different gradients of initial free residual chlorine concentration (5.0, 6.0, 7.0, 8.0 and 9.0 mg/L)and five different gradients of combined residual chlorine concentration (30.0, 36.0, 42.0, 48.0 and 54.0 mg/L) were set. At the same time, filtered seawater was set as the control for temperature treatment groups as well as the free chlorine treatments groups, whereas4.5×10^-5 mol/L NH₄OH was set as the control for the combine chlorine treatment groups. The results showed that the single temperature rise had no significant effect on the survival rate of juvenile S.paramamosain (P>0.05); The mortality rate of the free residual chlorine and combined residual chlorine to the juvenile was further increased in case of coupling with temperature rise. The 96 h semi-lethal concentration (96 h LC₅₀) of free residual chlorine and combined residual chlorine decreased gradually with the rising temperature, and reached the lowest value at 35 ℃. The LC₅₀ values at 96 h at 35 ℃ were 4.455 mg/L and 27.290 mg/L, respectively. The mortality rate increased by 0.316% and 0.027% with 1 ℃ temperature rise and 1 mg/L residual chlorine increase, respectively. At the same time, the safe concentration of free residual chlorinewas ranged from 0.446 mg/L to 0.544 mg/L, and the safe concentration of combined residual chlorineranged from 2.729 mg/L to 3.294 mg/L.The 96 h half-lethal concentration of the combined residual chlorine was about 6 times of the value of the free residual chlorine, and the increase in juvenile crabs mortality caused by free residual chlorine together with temperature rise was about 11.7 times of the mortality caused by the combined residue chlorine only.The findings can provide a scientific basis for evaluating the effecton crustaceans associated with residual chlorine discharge in the sea areaon crustaceans in the sea area of Sanmen Bay Nuclear Power Plant, and also provide a data reference for the formulation ofthe standards of warm water discharge discharge for coastal power plant.

Key words： water temperature residual chlorine juvenile Scylla paramamosain acute toxicity warm water discharge

Received: 20 July 2021

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	CHEN Lin
	TENG Shuangshuang
	LU Zhen
	XIAO Guoqiang
	CAI Jingbo

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CHEN Lin,TENG Shuangshuang,LU Zhen, et al. Acute Toxicity of Water Temperature and Residual Clorine to Juvenile Mud Crab Scylla paramanosain[J]. Fisheries Science, 2023, 42(5): 830-838.

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https://www.shchkx.com/EN/10.16378/j.cnki.1003-1111.21131 OR https://www.shchkx.com/EN/Y2023/V42/I5/830

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