Abstract: The accumulation of Zn(Ⅱ)in juvenile sea cucumber(Apostichopus japonicus)with body weight of (2.002±0.210)g and effect of Zn(Ⅱ)on the growth and survival were determined in the sea cucumber exposed to zinc at Zn(Ⅱ)concentrations of 0.050,0.150 mg/L and 0.500 mg/L in static water at water temperature of 10 -13℃for 75 days.The results showed that there were no toxicity and death in the sea cucumber juveniles exposed to Zn(Ⅱ)concentrations of 0.050 mg/L,and 0.150 mg/L,with growth rates of(60.10±17.11)%and(50.37± 6.29)%in body length,the growth rates of(145.305±14.671)%and(100.949±40.471)%in body weight,no significant different with the control group(the body length growth rate of(60.34±17.11)%and body weight growth rate of(146.354±14.671)%)(P＞0.05).The sea cucumber juveniles exposed to Zn(Ⅱ)concentrations of 0.500 mg/L,however,had lower growth rates in body length and weight than the juveniles in other group did, and then turned into the toxic,degrowth(-24.94%±13.21%in body length,-23.776%±17.706%in body weight),even death(survival rate of was(38.67±15.53)%.The Zn(Ⅱ)showed chronic and sustained toxicity. There was a positive relationship between accumulation quantity and rate and exposure period and the concentrations of Zn(Ⅱ)(P＜0.05).The accumulation of Zn(Ⅱ)were found to be 1.4 time in the juveniles exposed to zinc at concentrations of 0.000 mg/L,2.0 times in the juveniles exposed to zinc at concentrations of 0.050 mg/L, 2.3 times in the juveniles exposed to zinc at concentrations of 0.150 mg/L,and 3.8 times in the juveniles exposed to zinc at concentrations of 0.500 mg/L compared to those at the beginnings,and the accumulation rates were(0. 4022±0.1260),(1.0160±0.0215),(1.3245±0.0807)mg/(g·d)and(2.8000±0.0185)(g·d),respectively.The concentration coefficient indicated that the juveniles had great accumulation ability of Zn(Ⅱ),accumulation of Zn(Ⅱ)when they were exposed to natural sea water.
2011, Vol. 26 
