DISTRIBUTION OF HEAVY METALS IN FRESHWATER SHRIMP AQUACULTURE ENVIRONMENT IN HUNAN PROVINCE

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Tian Jinjin, Yang Can, Tang Yan, Zhu Yulin

Abstract

Objective to investigate the heavy metal pollution and correlation of freshwater shrimp culture environment in Hunan Province. In this study, the water and sediment samples were collected from freshwater shrimp culture bases in Yiyang, Yueyang and Changde areas of Hunan Province. The contents of Cd, Pb, as, Hg and Cr in aquaculture environment were detected. Statistical analysis showed that the detection rate of heavy metals in freshwater shrimp culture environment in Hunan Province was 100%.  The contents of Cd, as and Cr in different areas was statistically significant (P < 0.05) in water. The contents of As, Pb, Hg and Cd were significantly different in different areas (P < 0.05) in the sludge, and Yiyang > Yueyang > Changde. The over standard rate of heavy metals in sediments was significantly higher than that in water environment (P < 0.05). The over standard rate of arsenic is the highest, 45% and 85% respectively. Correlation analysis showed that there was a certain correlation between Cr and Hg (rs = 0.608, P < 0.001), Pb and Cr (rs = 0.545, P < 0.001) in water. In the sediments, there was a certain correlation between Cr and Hg (rs = 0.744, P < 0.001), and between Pb, As and Cd (rs = 0.761, P < 0.001; rs = 0.968, P < 0.001; rs = 0.803, P < 0.001). There were correlations between CR and Pb, As, Hg in aquaculture water and sediment (Pb: rs = 0.513, P < 0.05; As: rs = 0.803, P < 0.001; Cr: rs = 0.693, P < 0.001). In general, the freshwater shrimp culture environment in Hunan Province has a certain degree of heavy metal pollution and there are regional differences, which should be paid attention to. However, there is almost no heavy metal over-standard in the edible part of Protocladium clavinii in freshwater shrimp breeding base in Hunan province, and it can be eaten with peace of mind.

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