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Microplastics in fish species from the eastern Guangdong: Implications to Indo-Pacific humpback dolphin (Sousa chinensis) and human health
Summary
Researchers examined microplastic contamination in 15 fish species from eastern Guangdong, China, including 11 species that are prey for endangered Indo-Pacific humpback dolphins. They found the highest microplastic levels in fish digestive tracts, with pelagic species being most affected, and identified ethylene vinyl acetate and polyethylene as the dominant plastic types. The study raises concerns about microplastic transfer through the food web to both dolphins and humans who consume these fish.
Microplastic (MP) pollution is widespread in aquatic environments, accumulating in organisms and transferring through the food web. This study investigated MP abundance, composition, and distribution in 15 fish species from eastern Guangdong, 11 of which are prey for Indo-Pacific humpback dolphins (Sousa chinensis). Results indicated the highest MP abundance in fish gastrointestinal tracts, with pelagic species being the most affected. Ethylene vinyl acetate (EVA) and polyethylene (PE), linked to local industrial activities, were the most prevalent polymers. Risk quotients (RQ) at 95th percentile for Indo-Pacific humpback dolphins exceeded one, suggesting significant MP exposure risk via prey ingestion. In contrast, the MPs risk for humans through fish consumption was minimal. These findings underscore the urgent need for improved plastic waste management to protect marine apex predators.