Microplastic contamination and risk assessment in blue shark (Prionace glauca) from the eastern tropical Pacific Ocean

• Published in: Marine pollution bulletin Vol. 184; p. 114138
• Main Authors: Huang, Xuemin, Gao, Huachen, Li, Zezheng, Wu, Feng, Gong, Yi, Li, Yunkai
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2022
• Subjects: Blue shark; Eastern tropical Pacific Ocean; Microplastic; Risk assessment; Blue shark; Microplastic; Risk assessment; Eastern tropical Pacific Ocean
• ISSN: 0025-326X; 1879-3363
• DOI: 10.1016/j.marpolbul.2022.114138

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. [Display omitted] •Baseline microplastic contamination in blue shark Prionace glauca found from oceanic regions.•The majority of microplastics were fibrous in shape, blue in color, and polyethylene terephthalate in composition.•Our results demonstrate for the first time the occurrence of individual specialization in ecological risks of MPs in pelagic shark species.