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Microplastic contamination and risk assessment in blue shark (Prionace glauca) from the eastern tropical Pacific Ocean
Summary
Researchers quantified microplastic abundance and characteristics in the digestive tracts of blue sharks (Prionace glauca) from the eastern tropical Pacific Ocean and conducted a risk assessment for microplastic pollution in this pelagic apex predator. The study found microplastics in 39.1% of specimens — predominantly blue fibers sized 46 to 3,220 micrometers — with similar abundance across sexes, indicating widespread exposure of blue sharks to microplastic pollution in open ocean environments.
We quantified the abundance and characteristics of microplastics in the blue shark, Prionace glauca, found in the eastern tropical Pacific Ocean and investigated the potential microplastic pollution risks. Microplastics (MPs) were detected in 39.1 % of specimens, up to 0.15 ± 0.38 items/g wet weight of the posterior part of the pylorus, and were sized 45.87 to 3220.12 μm. The majority were fibrous in shape (83.3 %) and blue in color (72.2 %). Both sexes of sharks had similar MP abundance and characteristics, except for polymers, with polyethylene terephthalate and polypropylene representing the dominant type in males and females, respectively. Most individuals experienced low pollution, but one male P. glauca exhibited a high ecological risk level owing to the high MP abundance and detection of polyvinyl chloride. This study provides an important baseline for the ingestion of microplastics by pelagic shark species and is a preliminary quantitative measure that could be used in future studies of the risk of MPs.