Mn2+ 和流速对 GIFT 罗非鱼(Oreochromis niloticus)幼鱼血液和生理指标的影响

Bolan Song, Luqi Zhao
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摘要

为了评估水环境中不同流速下重金属离子对鱼类的毒理学影响,我们研究了Mn2+和流速对GIFT罗非鱼幼鱼(95.2±4.3g,15.1±0.21cm)生理指标的影响。实验设计包括四种不同的 Mn2+浓度水平:对照组(0mg/L)、0.1mg/L、0.5mg/L 和 1mg/L,以及三种不同的流速:对照组(0 体长/秒)、低速组(1 体长/秒)和高速组(2 体长/秒)。主要研究结果如下Mn2+ 对 GIFT 罗非鱼幼鱼的血液学参数有不同的影响。随着 Mn2+ 含量的增加,鱼的红细胞(RBC)数量和血红蛋白含量都显著下降(P0.05)。其对鱼体抗氧化指标的影响也有一定的诱导作用,SOD、CAT的活性、MDA的水平与流速之间存在显著的相关性(P0.05)。这些研究结果可为研究重金属胁迫对水生环境鱼类生态毒理学的影响以及河北省GIFT罗非鱼人工流水养殖提供基础数据。
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Effects of Mn2+ and flow speed on blood and physiological indexes of larvae GIFT tilapia (Oreochromis niloticus)
To assess the toxicological effects of heavy metal ions on fish at different flowing speeds within aquatic environments, we investigated the impact of Mn2+ and flow speed on the physiological parameters of juvenile GIFT tilapia (95.2±4.3g,15.1±0.21cm). The experiment design included four different levels of Mn2+ concentration: control group (0mg/L), 0.1mg/L, 0.5mg/L and 1mg/L, as well as three different flow speeds: control group (0 body length/second), low speed (1 body length/second), and high-speed group (2 body lengths/second). The main research findings were as follows: Mn2+ had varying effects on the hematological parameters of juvenile GIFT tilapia. As the levels of Mn2+ increased, there was a remarkable reduction in both the red blood cell (RBC) number and hemoglobin content of the fish(P<0.05). The activity of SOD, CAT, the level of MDA in the liver and white blood cell (WBC) number exhibited an initial increase followed by a subsequent decrease, with the highest levels observed mostly in the 0.5mg/L group. However, With the prolongation of Mn2+ exposure duration, a significant decline in levels of RBC, hemoglobin, CAT and SOD was observed. In most cases, the highest values of those, as mentioned earlier four physiological parameters were recorded at 24 hours, while the lowest values were recorded at 96 hours when exposed to the same Mn2+ level. However, MDA levels reached their peak at 48 hours. These findings suggested that lower levels of Mn2+ might enhance the immune capacity of tilapia, while higher levels could impede its immune and antioxidant functions. An increase in flow speed led to a significant elevation in both the RBC number and hemoglobin content of the GIFT tilapia at 30d(P<0.05), but flow speed had no significant impact on the WBC of the fish(P>0.05). Its effect on the fish antioxidant parameters also showed a certain induction, and there were significant correlations between the activity of SOD, CAT, the level of MDA, and flow speed (P<0.05). At the same flow speed, the prolonging water-flow-stimulus duration could not increase the levels of three antioxidant parameters(P>0.05). These findings could provide fundamental data for investigating the influence of heavy metal stress on fish ecotoxicology in aquatic environments and the artificial running water breeding of GIFT tilapia in Hebei province, China.
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