铬对鲤生长、血清离子和某些激素分泌活动的影响

Effect of Cr^(6+) on growth, serem electrolytes and some hormone activities in Cyprinus carpio

将鲤(6月龄)饲养在Cr6+浓度系列:0、0.12、0.67、1.22、3.661、0.97和32.91mg.L-1的水体中40d,T0.12~T3.66组的绝对增重率和绝对增长率较对照鱼有增重的趋势;铬对鲤血清渗透压和血清离子的影响:自染毒T0.67组引起血清渗透压升高,血清Na+和Ca2+浓度较对照鱼也有明显提高;血清K+浓度有升高的趋势,仅T10.97组有显著差异;个别染毒组Mg2+浓度降低;铬对多数染毒鱼的Cl-浓度影响不明显。铬对血清激素水平影响:T3.66组的T3含量、T10.93组的T4含量以及T0.67组以上的高剂量染毒组的皮质醇含量均较对照鱼明显升高。多数铬处理组鲤肌肉的粗蛋白和粗脂肪含量较对照鱼降低。鱼体铬蓄积量大小依次为:肌肉<鳃<肝<肠。肌肉中铬含量超标(3.00mg.kg-1)为T32.91组鱼,肠中铬超标(2.24mg.kg-1)为T0.67组鱼。

The Cyprinus carpio （6 months old） were exposed to water bodies with different concentration of Cr^6＋ ranged from 0,0.12, 0.67,1.22, 3.66, 10.97 and 32.91 mg·L^-1, respectively. An increase in growth rote （AGR and ALR） was observed in T0.12 to T3.66 Cr^6＋ -treated groups. The results showed that Cr^6＋ also affected serum osmolarity and serum electrolytes. The serum osmolality and Na^＋ and Ca^2＋ concentration were significantly higher in the Cr^6＋ - treared groups than in the controls. Increase of serum K^＋ was also observed, but it was only significant in T10.97 group. The concentrations of serum Mg^2＋ from a few Cr^6＋ treated groups were decreased. No obvious serum Cl^- concentration changes were observed. Cr^6＋ affected serum hormonal responses. The T3 content in T3.66 group and T4 content in T10.93 group, and the cortisol levels from all the groups treated with Cr^6＋ concentration 0.67 and higher were significantly increased. The nutritional contents （crude protein and crude fat） in fish from most of the Cr^6＋ treated groups were lower than the control. The concentration of Cr in a fish body treated with Cr^6＋ had a distribution pattern： muscle 〈 gill 〈 liver 〈 Intestines. The Cr concentration in fish muscle from group T32 91 （3.00 mg·kg^-1） and the Cr concentration in intestines from group T0.67（2.24 mg·kg^-1 ） and from all the groups treated with higher Cr^6＋ exceeded the national maximum limit for food safety.