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Foraging response of bluegill Lepomis macrochirus to microplastics and subsequent impacts on swimming performance
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Researchers reviewed the physiological and immunological effects of microplastic exposure in fish, finding that these particles smaller than 5 mm induce a range of biological disruptions including immune modulation, oxidative stress, and systemic health impacts with broader implications for aquatic ecosystem integrity.
Acute Effects of Size Dependent Low-Density Polyethylene Microplastics on Zebrafish
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Zebrafish embryos exposed to low-density polyethylene microplastics for 48 hours accumulated particles in their gut, experienced reduced hatching rates, increased heart rates, and significant tissue damage, with smaller particles causing the most harm. These acute effects in a widely used model organism suggest that even brief early-life exposure to plastic particles can disrupt normal development.
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Researchers examined microplastic ingestion by fish communities across different zones of a Neotropical reservoir in Brazil, finding that fish in calmer, lake-like zones and bottom-dwelling insect-eating species were most likely to ingest plastic particles. The study suggests that both reservoir design and fish ecology shape how microplastics move through freshwater food webs.
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A global synthesis of microplastic ingestion data from marine, freshwater, and estuarine fish found that 49% of sampled fish worldwide had ingested plastic, averaging 3.5 pieces per fish, with freshwater fish and those from aquaculture sources showing higher ingestion rates than wild marine fish. This comprehensive analysis reveals that microplastic contamination of fish — a primary human protein source globally — is now the rule rather than the exception, underscoring urgent risks to food safety.
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