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Random or not? Comparing Microplastic Ingestion and Preys in Scomber colias and Trachurus trachurus
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Researchers examined microplastic ingestion in two commercially important fish species—Scomber colias and Trachurus trachurus—comparing ingested plastic characteristics to prey items to assess whether ingestion was selective or random. Understanding whether fish actively or incidentally consume microplastics has direct implications for estimating human dietary exposure through seafood consumption.
Microplastics represent a rising threat to marine biota. In the last decades, plastic production has grown exponentially, reaching an annual global production of nearly 370 million tons in 2019.
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Microplastic in fish – A global synthesis
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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.
Secondary Microplastic Ingestion by Planktivorous Fishes in the Sea of Oman
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Planktivorous fish in the Sea of Oman were found to have ingested secondary microplastics — fragments derived from the breakdown of larger plastic debris — demonstrating that plastic contamination is reaching mid-level marine food web organisms in the Arabian Sea region. Fish ingestion of microplastics is a key pathway through which plastic particles and their associated chemical contaminants can transfer into seafood consumed by humans.
Impact of Plastic Waste Ingestion by Fish
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This review synthesized experimental evidence on how microplastic ingestion affects fish physiology and behavior, finding that plastics act as vectors for toxic chemicals including mercury, cause oxidative stress, and transfer contaminants up the food chain to human consumers. Because microplastics bioaccumulate through trophic levels, populations relying heavily on seafood—particularly from coastal regions—face compounded exposure risks that extend well beyond the plastic particles themselves.
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