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| Physiological, Biochemical Characteristics of Fish and Paddy Environment in the Rice-Carp-Tilapia Co-culture System with Different Densities |
| YI Meng-Meng1, MO Jie-Lin2, MO Hang2, WANG Miao1, ZHAI Wan-Ting1, WANG He1, LIU Zhi-Gang1, GAO Feng-Ying1, CAO Jian-Meng1, KE Xiao-Li1, LU Mai-Xin1,* |
1 Key Laboratory of Tropical & Subtropical Fishery Resource Application & Cultivation, Ministry of Agriculture / Guangdong Provincial Key Laboratory of Aquatic Animal Immune Technology, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China;
2 Guangxi Sanjiang Dong Autonomous County Aquaculture Technology Promotion Station, Sanjiang 545500, China |
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Abstract Rice-fish co-culture system with considerable economic and ecological benefits requires improvement because of its low fish yield. Based on the Sanjiang model of rice-fish co-culture system, Jinbian carp (Cyprinus carpio var. Jinbian) was reared with tilapia (Oreochromis niloticus, GIFT strain) and the breeding density was increased in the current research. The influence of increased density and polyculture on the economic and ecological benefits of the rice-fish co-culture system was investigated. It was observed that after 145 days of the experiment, weight gain rate and specific growth rate (415.3% and 1.2, respectively) of carp in high density integrated culture group (IDh) were significantly higher than those in low density integrated culture group (IDl) and monoculture group (SD), and weight gain rate (4918.0%) of tilapia in IDh was significantly higher than those in IDl (P<0.05). The density and polyculture of the rice-fish co-culture system affected the activities of the digestive enzymes amylase, lipase and liver catalase. The activity of carp digestive enzymes amylase in IDl was significantly higher than that in IDh and SD, but the activity of carp liver catalase in IDh was significantly lower than that in IDh and SD (P<0.05). The activities of tilapia digestive enzymes amylase and lipase in IDh were significantly higher than those in IDl (P<0.05). In addition, the density and polyculture of the rice-fish co-culture system influenced the water quality of paddy and pond, such as more ammonia-nitrogen (NH4-N) of SD, nitrate-nitrogen (NO3-N) and nitrite-nitrogen (NO2-N) of IDl, total nitrogen (TN), total phosphorus (TP), chemical oxygen demand (CODCr) and organic matter (OM) of IDh in paddy were decreased. More NH4-N, NO3-N and NO2-N of SD, TN, CODCr and OM of IDh, TP of IDl in the pond were decreased. In summary, the increased density and polyculture of rice-fish co-culture systems in this study did not harm the growth performance of fish and the water quality of paddy and pond. It actually promoted mass circulation and improved the economic benefits to a certain extent. Based on this study, a higher density of fish in the rice-fish co-culture system could be tried to enhance the economic benefits.
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Received: 27 July 2021
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Corresponding Authors:
*mx-lu@163.com
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