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Seafood is Impregnated with Microplastics — Study

180 out of 182 samples contained these anthropogenic particles.

While retail-purchased samples generally had higher concentrations of these contaminates than vessel-retrieved samples, the difference was negligible to marginal at most.

Seafood is Impregnated with Microplastics — Study Image Credit: Alexander Spatari / Getty
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A study published in late December 2024 documented how Pacific seafood caught off the U.S. west coast is heavily contaminated with microplastics. This study analyzed samples from seafood caught in this region for microplastics (MPs) and other anthropogenic particles (APs). 

“Anthropogenic particles (APs), a broad category of materials produced or modified by humans, include microplastics (MPs), plastics less than 5 mm in diameter at their longest dimension,” the study said in the ‘Introduction’ section. “Environmental MPs are found in a variety of shapes, including films, foams, pellets, beads, fibers, fragments, and tire wear particles.”

The researchers chronicled the species they tested.

“We quantified APs in the edible tissue of black rockfish, lingcod, Chinook salmon, Pacific herring, Pacific lamprey, and pink shrimp, comparing AP burdens across trophic levels and between vessel-retrieved and retail-purchased individuals,” the study said in the ‘Abstract’ section.

180 out of 182 samples contained these anthropogenic particles. The researchers also mentioned which species had the highest and lowest levels of contamination.

“Of the 182 individuals sampled, only two (one vessel-retrieved Pacific herring and one vessel-retrieved lingcod) had no detected APs in their tissue although these were smaller samples 0.18–19 g of muscle (Lingcod) or full tissue (herring) sampled,” the study said in the ‘Discussion’ section. “The study results mirror those of Akoueson et al. (2020) and Barboza et al. (2020) and provide evidence of the widespread presence of APs in the edible tissues of Oregon’s marine and freshwater species across trophic levels and feeding modes. Pink shrimp, which filter-feed in the upper water column which contains 8–9200 AP particles/m3, had the highest concentrations of APs (ODFW, 2019; Curren et al., 2020Dawson et al., 2021Yang et al., 2021). On the other hand, Chinook salmon had the lowest concentrations, followed by black rockfish and lingcod.”

While retail-purchased samples generally had higher concentrations of these contaminates than vessel-retrieved samples, the difference was negligible to marginal at most.

“The vast majority of the suspected APs (65%) were materials such as cellulose, cotton fiber and cellulose acetate, with about 17% of the materials fully synthetic, 9% semi-synthetic and 8% natural,” U.S. Right To Know said regarding the study. “Synthetic and semi-synthetic material types included polyethylene terephthalate, polypropylene, low- and high-density polyethylene, polyethylene vinyl acetate, fiberglass and semi-synthetic cardboard. The research team also found one instance of a common material used in marine rope, flame-retardant fabrics and military applications.”


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