Microplastics permeate global seafood supplies

A 2025 study examining 182 samples of fish and crustaceans from Oregon waters detected plastic particles in 180 samples, a 99% contamination rate. The affected species included pink shrimp, Pacific herring, Chinook salmon, and lingcod, with the highest concentrations found in filter-feeding shrimp. Microfibers from textiles constituted over 80% of the particles identified, followed by fragments and films.  Researchers confirmed these particles migrate from marine organisms’ digestive tracts into edible muscle tissue, directly entering the human food supply.   

Pathways and Prevalence  

Microplastics enter aquatic systems through multiple routes: synthetic clothing shedding fibers in washing machines, degraded plastic waste, and industrial discharge. Once in waterways, they accumulate in zones where plankton, a primary food source for many seafood species, gathers. Filter feeders like shrimp ingest these particles directly, while fish consume contaminated prey, facilitating trophic transfer. Notably, species feeding near the ocean surface show higher contamination levels.  Geographical variability exists, with regions experiencing intense plastic pollution demonstrating heightened risks in seafood.   

Health Implications  

Microplastics carry chemical additives like bisphenols and flame retardants, along with environmental pollutants such as PCBs that adsorb to their surfaces. Peer-reviewed studies associate these particles with potential health risks in humans, including inflammation, cardiovascular events, and disruption of gut microbiota. Particles under 10 micrometers can cross biological barriers, with research detecting them in human blood, placentas, and organs.  While exact health consequences require further study, the European Food Safety Authority emphasizes understanding dose-dependent toxicity and polymer-specific risks.   

Mitigation Efforts  

Current solutions focus on interception technologies and policy interventions:  

• Filtration systems: NOAA-funded projects are testing washing machine filters capable of capturing 87% of microfibers, while stormwater catch basin installations aim to trap roadway plastic runoff before it reaches oceans.   
• Certification programs: Labels like GLOBALG.A.P.’s GGN verify sustainable aquaculture practices, responding to consumer demand for transparent sourcing.   
• Consumer actions: Rinsing seafood reduces surface microplastics introduced during processing. Cold-water washing of synthetic fabrics also decreases fiber shedding.   

According to leading food poisoning law firm Ron Simon & Associates, international initiatives, including the UN’s treaty to end plastic pollution, highlight the growing recognition of this cross-border food safety challenge.