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Updated: Oct 27, 2025

Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris
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Fish Ingest Microplastics Unintentionally.

Bowen Li1, Weiwenhui Liang1, Quan-Xing Liu2

  • 1State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China.

Environmental Science & Technology
|July 23, 2021
PubMed
Summary
This summary is machine-generated.

Fish inadvertently ingest microplastics, primarily microfibers, through passive suction during respiration, not active feeding. They exhibit rejection behaviors, but some microplastics remain in their systems, especially when food is present.

Keywords:
breathcoughecological riskfeeding behaviormicrofiber

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Area of Science:

  • Environmental Science
  • Marine Biology
  • Ecotoxicology

Background:

  • Microplastics (<5 mm) are pervasive environmental contaminants with known detrimental effects on aquatic life.
  • Understanding fish behavior towards microplastics, particularly during feeding, is crucial for assessing ecological risks.

Purpose of the Study:

  • To investigate the feeding behavior of four fish species exposed to microplastics (pellets and microfibers).
  • To elucidate the pathways of microplastic ingestion and identify potential fish rejection mechanisms.

Main Methods:

  • High-definition and high-speed observational experiments were conducted on juvenile fish.
  • Two common microplastic shapes (pellets and microfibers) were used to simulate environmental exposure.

Main Results:

  • Swallowing-feeding fish ingested more microplastic pellets than filtering- or sucking-feeding fish.
  • Fish did not actively capture microfibers but passively ingested them during respiration.
  • Fish exhibited rejection behaviors like coughing up microfibers, yet some microfibers were retained in gills and gastrointestinal tracts, with ingestion increasing in the presence of food.

Conclusions:

  • Fish ingest microplastics inadvertently rather than intentionally.
  • Passive suction during respiration is a significant pathway for microplastic entry into fish.
  • Findings inform ecological risk assessment and food safety evaluations concerning microplastic contamination.