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| Abundance and characteristics of microplastics in fish gastrointestinal tract of Nandu River on Hainan Island |
| LIANG Hong-bo1,2, JIANG Ru-yi1,2, LIU Zi-yang1,2, XU Kang1,2, WANG Sai2, WANG Tuan-tuan3 |
1. College of Marine Sciences and Engineering, Hainan University, Haikou 570228, China;
2. State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China;
3. College of Ecology, Hainan University, Haikou 570228, China |
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Abstract Microplastics (MPs) pollution has become a hot research topic in the environmental field, while few studies have reported the MPs pollution in the gastrointestinal tract of river fish in Hainan Island. In the present study, 222 freshwater fish specimens belonging to 35 species with different feeding habits were collected from 11 sampling sites located in the upper, middle, and lower reaches of the Nandu River. The pollution characteristics of MPs in the gastrointestinal tract of fish samples were analyzed. The results showed that MPs were detected in 94.5% of the fish gastrointestinal tracts, with an average abundance of (4.85±3.51)MPs per fish. The MPs in fish gastrointestinal tract were dominated by <1.0mm (73.3%) transparent (38.9%) fibers (60.6%), and were mainly composed of polypropylene (53.3%) and polyethylene (34.2%). The highest abundance of MPs was recorded in the gastrointestinal tract of filter-feeding planktivorous fish (7.00 per fish) and the lowest abundance was recorded in the gastrointestinal tract of insectivorous fish (2.57 per fish). From the upper to the lower reaches, the percentage of blue fragment MPs with size <1.0mm in the fish gastrointestinal tract was increasing, while the percentage of yellow/red fiber/film MPs with size >1.0mm was decreasing. This could be attributed to the increase of aquacultural activities, the usage of agricultural films, and a large amount of sewage and industrial wastewater in the lower reaches.
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Received: 30 August 2024
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Corresponding Authors:
王团团,责任作者,讲师,ttwang@hainanu.edu.cn
E-mail: ttwang@hainanu.edu.cn
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