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No measurable “cleaning” of polychlorinated biphenyls from Rainbow Trout in a 9 week depuration study with dietary exposure to 40% polyethylene microspheres
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Researchers found that feeding rainbow trout uncontaminated polyethylene microspheres (40% of diet) for 9 weeks did not measurably enhance elimination of polychlorinated biphenyls (PCBs) already accumulated in the fish. The results suggest that ingesting clean plastic does not act as a 'cleaning' mechanism for persistent organic pollutants in fish tissue.
Persistent hydrophobic chemicals sorbed to plastic can be transferred to fish and other aquatic organisms upon ingestion. However, ingestion of plastic could also lead to enhanced elimination of these chemicals if the plastic is less contaminated than the fish. Here, we attempted to measure the influence of ingestion of uncontaminated polyethylene microspheres on the depuration rates of polychlorinated biphenyls (PCBs) in an in vivo fish feeding experiment. Rainbow trout were given feed contaminated with PCBs for two consecutive days, then clean feed for three days to allow for egestion of the contaminated food. A control group of fish were then fed ordinary food pellets and a treatment group were fed pellets that additionally contained 40% by weight polyethylene microspheres. Condition factors and growth rates in both groups were similar, indicating no negative effect of the plastic microspheres on the nutritional status of the fish. Fish were sampled after zero, three, six and nine weeks, homogenized, solvent-extracted and analyzed by GC/MS. PCB concentrations declined in both groups at a rate consistent with growth dilution. There was no significant difference in the elimination rate constants between the control and treatment group, indicating that ingestion of uncontaminated plastic did not cause a measurable enhancement of depuration of PCBs by the fish in this study.
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Researchers tested whether microplastic ingestion increases the bioconcentration of hydrophobic organic chemicals in zebrafish, examining the so-called 'Trojan horse' effect. They found that exposure to contaminated polyethylene microplastics did not significantly increase chemical accumulation in fish compared to waterborne exposure alone. The study suggests that for these chemicals, direct water exposure remains the dominant uptake pathway, and the microplastic carrier effect may be less concerning than previously thought.
Microplastic-mediated transport of PCBs? A depuration study with Daphnia magna
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Researchers tested whether microplastics could help remove PCBs from the water flea Daphnia magna, finding that only one PCB congener was cleared more efficiently with microplastic exposure while most others were unaffected. The study suggests microplastics have limited value as a depuration tool for PCB-contaminated zooplankton under environmentally relevant conditions.
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Goldfish fed food mixed with PCB-contaminated microplastics absorbed only slightly more PCBs than fish fed just PCB-contaminated food without microplastics. This suggests that microplastics may not significantly increase the amount of PCBs that fish absorb from their diet, though they do act as carriers.
Do foodborne polyethylene microparticles affect the health of rainbow trout (Oncorhynchus mykiss)?
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Researchers fed rainbow trout diets containing polyethylene microparticles at three concentrations for six weeks and evaluated various health indicators including growth, organ condition, blood chemistry, and gut histology. The study found that pristine polyethylene microparticles at environmentally relevant concentrations did not cause significant adverse health effects in the fish over the exposure period.
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Rainbow trout were fed diets containing polystyrene microplastics (100–400 μm, including virgin and environmentally-conditioned particles) for 4 weeks, with histological and functional assays finding no significant disruption of intestinal transport, barrier integrity, or immune function. The study suggests that relatively large microplastics do not impair key gut functions in fish even after chronic dietary exposure.
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