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Comparison Between American Ecological Aquaculture and Traditional Polyculture in Environmental Impact
- LIANG Bin, ZHANG Jian, ZHOU En-Hua, ZHANG Yong-Jiang, CHEN Huan-Gen, ZHU Yi-Ling, Sylvana Li, MIAO Xu-Bo
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2010, 26(4):
339-343.
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Abstract
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An aquaculture experiment was carried out in Yangzhong,Jiangsu Province,with grass carp as the principal fish,to compare ecological aquaculture with traditional polyculture in impact on water quality and sediments.It was found that the former was obviously superior to the latter in yield and economic profit.The annual mean values of some of the water quality indexes,such as COD,TP,TN,NH3-N,and NO2--N were measured to be 21,0.12,2.06,0.340 and 0.021 mg·L-1 for the ponds of US 80:20 ecological aquaculture,and 25,0.15,2.56,0.706 and 0.113 mg·L-1 for the ponds of traditional polyculture.Obviously the former was better than the latter,respectively.No significant differences were found in contents of BOD5,PO43--P,NO3--N and chlorophyll-a.The bottom sediment was 12.5% thinner in the ponds of the US 80:20 ecological polyculture than in the ponds of the traditional polyculture,11.2% higher in organic matter content,but 13.5% and 5.1% lower in TP and TN.The mechanism of generation of the pollutants has been analyzed.