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Discussion on the Occurrence and Sources of Microplastics in the Digestive Tracts of Freshwater Fish (Gnathopogon elongatus elongatus)
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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.
マイクロプラスチック(MPs)は難分解性であり長期間水環境中に残留するため，水圏生態系に悪影響を及ぼすことが懸念されているが，日本では水生生物を対象とした研究事例は少ない．本研究では，淡水魚類消化管中MPsの存在実態および，消化管中MPsと魚類の生息環境中MPsの関係性の把握を試みた．タモロコ消化管中から検出されたMPsは，6月と10月で個数に有意な差がみられ，産卵期における摂餌行動の活発化の影響が示唆された．底泥中のMPはPolyester繊維が最多であり，洗濯排水に由来する繊維状MPsが正観寺川と正観寺沼に流入し，底質に堆積することが示唆された．消化管中MPsと底泥中MPsの成分を比較した結果，タモロコは底生動物などを捕食する際に，底泥中MPsも体内に取り込んでいることが確認された．
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