Polystyrene Nanoplastics Increase the Toxicity of Arsenic to the Zebrafish (Danio Rerio) Intestine Via the Antioxidant System, Microbial Diversity, and Metabolomics

Oxidative damage and intestinal microbial imbalance induced by polystyrene microplastics and cadmium in zebrafish (Danio rerio)

Bioaccumulation and Toxic Effects of Micro- and Nanoplastics in Zebrafish: A Critical Review

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Researchers comprehensively reviewed micro- and nanoplastic bioaccumulation and toxicity in zebrafish, finding that these particles accumulate in digestive organs, gills, liver, and brain, inducing oxidative stress, developmental delays, neurotoxicity, and transgenerational reproductive impairments that highlight broad ecological risks.

Simulated Environmental Nanoplastics Induce Zebrafish Developmental Toxicity and Stress Response

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Scientists exposed zebrafish embryos to nanoplastics that were specially broken down to mimic how plastic actually degrades in oceans and rivers, and found they caused more harm than the lab-made plastic beads typically used in research, stunting growth, slowing hatching, and triggering stress hormone spikes even at very low doses. Because these effects showed up at concentrations similar to what's found in real water sources, the findings suggest current safety testing may be underestimating the risks nanoplastics pose to both aquatic life and, potentially, to people who drink that water or eat seafood from it.

The Role of Humic Acids on the Effects of Nanoplastics in Fish

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Humic acids — naturally occurring organic compounds in freshwater — alter the surface properties of nanoplastics and modulate their toxicity to fish, in some cases reducing harm and in others increasing it. This finding shows that environmental context matters when assessing nanoplastic risk, as water chemistry can substantially shift biological outcomes.

Toxic effects of co-exposure to polystyrene nanoplastics and arsenic in zebrafish (Danio rerio): Oxidative stress, physiological and biochemical responses

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In a zebrafish study, polystyrene nanoplastics made arsenic more toxic by helping the poison build up in the liver, gills, and intestines. The nanoplastics increased cell damage and oxidative stress beyond what arsenic alone would cause. This shows that nanoplastics can act as carriers for other toxic substances in water, potentially making environmental pollutants more dangerous to aquatic life and the food chain.