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| Effects of Integrated Aquaculture Model of Rice-Shrimp-Eel on Water Environment |
| ZHANG Yuanyuan1,2, LI Hong1, JIA Tao1, PENG Xinliang3, ZHAO Liangjie3 |
1. Henan Academy of Fishery Sciences, Zhengzhou 450044, China;
2. Centre for Research on Environmental Ecology and Fish Nutrition (CREEFN), Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai 201306, China;
3. College of Fisheries, Xinyang Agriculture and Forestry University, Xinyang 464000, China |
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Abstract To probe for the effects of integrated aquaculture model of rice-shrimp-eel on the water environment, eel cages were set up in different positions in the circular groove, and water samples inside the cages, outside the cages and different positions in circular groove were collected and tested every half a month in Xinyang, Henan province from August to October 2020. The results showed that in different periods the dissolved oxygen concentration (DO) inside the cage was always the lowest, DO inside and outside the cages were both lower than that in ring ditch (P>0.05), without significant differences at 4 sampling sites in pH. NH+4-N levels inside and outside the cage were significantly higher than that far away from the cages (P<0.05), and NO-2-N and NO-3-N levels were significantly lower than that far away from the cages (P<0.05). TN and TP levels inside and outside the cage were higher than those in other sites. TN levels showed an upward trend and TP levels showed a downward trend, TN and TP in the ring ditch far away from the cage showed an upward trend. The results showed that the integrated aquaculture mode of rice-shrimp-eel led to enhance N and P levels in the water, promoted the conversion efficiency of N and P in the nearby water as well as the process of denitrification, and reduced the risk of eutrophication in the water, but the low dissolved oxygen in the cage affected the healthy growth of aquatic animals. The findings can provide a theoretical reference for the development and improvement of integrated aquaculture model of rice-shrimp-eel.
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Received: 06 January 2021
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