Discussion on the Occurrence and Sources of Microplastics in the Digestive Tracts of Freshwater Fish (Gnathopogon elongatus elongatus)

Summary

Researchers investigated the occurrence and sources of microplastics in the digestive tracts of the freshwater fish Gnathopogon elongatus elongatus (tamoroko) collected from a river and pond in Japan, finding significant seasonal differences in microplastic counts between June and October linked to spawning-period feeding behavior. Bottom sediment analysis revealed polyester fibers as the dominant polymer type, suggesting laundry-derived fibers deposited in sediments were being ingested when fish fed on benthic invertebrates.