The detective rate, abundance and physical characteristics of microplastics in the digestive tract and gills of Coilia Nasus, Hemiculter bleekeri, Pseudobrama simoni and Pelteobagrus nitidus collected along the Jingjiang sec-tion of the Yangtze River in 2012, 2014, 2016 and 2018 were analyzed to investigate the microplastic pollution of fish in the lower reaches of the Yangtze River before the Yangtze River fishing ban.The results showed that 1742 microplastics were detected in the digestive tract and gills of 480 fish of four fish species.The average de-tective rate was 96.25% and the average abundance was(3.63±2.12) items/individual.The abundance of mi-croplastics in P.nitidus and P.simoni was(4.24±2.39) items/individual and(4.04±2.09) items/individual, which was significantly higher than that of C.Nasus [(3.23±1.95) items/individual] and H.bleekeri [(3.02±1.75) items/individual].The average abundance of microplastics in the digestive tract of the four species of fish [(1.95±1.59) items/individual] was significantly higher than that in the gills [(1.68±1.38) items/individu-al].Still,the abundance of microplastics between the two parts of C.Nasus and H.bleekeri was similar.Among the four shapes of microplastics detected,the proportion of fragments(59.82%) and fibers(32.55%) was the high-est, the proportion of black(49.02%) and transparent(15.04%) was the highest among the eight colors, and the proportion of particle size <0.1 mm(27.80%) and 0.1～0.5 mm(46.84%) was the largest.The gill was found to have a larger particle size and a higher proportion of fiber,while the digestive tract had a higher pro-portion of black.The average abundance of microplastics in four fish species decreased from(3.93±2.06) i-tems/individual in 2012 to(3.32±1.99) items/individual in 2018, showing a significant decreasing trend.Compared with several large lakes of the Yangtze River,the abundance of microplastics of dominant fish in the Jingjiang section of the Yangtze River is relatively low, and the physical characteristics are also different.Agri-cultural films,packaging bags, plastic bottles, fishing gear and clothing may be important sources.
the Jingjiang section of the Yangtze Rivercoastal fishmicroplastic pollutiondigestive tractgill
维普
万方数据
