A study reveals that microplastics have infiltrated fish in isolated Pacific waters, with about one-third of sampled coastal fish containing the particles. Fiji shows particularly high levels, affecting nearly 75% of fish, while Vanuatu has much lower contamination at 5%. The findings highlight risks to local communities reliant on seafood.
Researchers have uncovered widespread microplastic pollution in fish from some of the Pacific's most remote areas. Published on January 28, 2026, in PLOS One, the study led by Jasha Dehm from the University of the South Pacific examined 878 coastal fish across 138 species caught near Fiji, Tonga, Tuvalu, and Vanuatu. Data came from published records in the Global Information Biodiversity Facility.
Overall, roughly one in three fish contained at least one microplastic particle, though rates varied by location. In Fiji, contamination reached nearly 75%, exceeding the global average of 49%, while only 5% of fish in Vanuatu showed traces. Two species common to all four countries—the thumbprint emperor (Lethrinus harak) and the dash-and-dot goatfish (Parupeneus barberinus)—exhibited higher levels in Fiji.
The analysis linked contamination to ecological traits. Reef-associated and bottom-dwelling fish were more affected than those in lagoons or open waters. Species feeding on invertebrates, foraging along the seafloor, or using ambush tactics also showed elevated rates.
Jasha Dehm noted: "The consistent pattern of high contamination in reef-associated species across borders confirms ecological traits as key exposure predictors, while national disparities highlight the failure of current waste management systems, or lack thereof, to protect even remote island ecosystems."
Dr. Amanda Ford emphasized: "While microplastic levels in Pacific fish are generally lower than in many industrialized regions, Pacific communities rely far more heavily on fish as a primary protein source. Combined with major data gaps across the region, this makes locally generated evidence essential as Global Plastics Treaty negotiations advance and are translated into national policies."
Dr. Rufino Varea warned: "Beyond the ecological insights, this study delivers a stark warning about the vulnerability of our food systems: we found that the reef-associated and bottom-feeding fish most accessible to our subsistence fishers are acting as reservoirs for synthetic pollution, particularly in Fiji, where nearly three-quarters of sampled individuals contained microplastics."
The research, funded by the Asia Pacific Network for Global Change Research under grant CRRP2022-05MY-Ford, points to population density and poor waste management in Fiji as possible factors. It underscores the need for stronger plastic policies to protect Pacific food security.