Plastic pollution degrades into tiny particles that accumulate in organisms. A systematic review in Neuroscience & Biobehavioral Reviews analyzes neurological effects of micro- and nanoplastics in fish.
Ubiquitous Plastic
Plastic seems inert, but environmental weathering breaks it into micro- and nanoscale particles. These particles enter food chains and accumulate in tissues, including brain tissue.
What happens when plastic particles reach the nervous system?
Meta-Analyzing Fish Studies
The authors systematically reviewed studies of micro- and nanoplastic effects on fish neurology. Fish are both ecologically important and useful models for neurotoxicity.
Across studies, micro- and nanoplastic exposure produced consistent neurological effects.
Neurological Damage
Exposed fish showed behavioral changes, altered neurotransmitter levels, oxidative stress in brain tissue, and gene expression changes. The particles appear to cause genuine neurotoxicity.
Effects varied with particle size, concentration, and plastic type, but the overall pattern was concerning.
Implications
Fish studies may predict effects in other species, including humans. As plastic pollution worsens, understanding neurotoxicity becomes increasingly urgent.
Reference: Bhattacharyya S, et al. (2025). Neurological effects induced by micro- and nanoplastics in fish: A systematic review and meta-analysis. Neuroscience & Biobehavioral Reviews. doi: 10.1016/j.neubiorev.2025.106164 | PMID: 41167164
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