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Nanoplastics toxicity in aquatic organisms: a review of effects on selected marine and freshwater species
Summary
This review analyzed 128 studies on the effects of nanoplastics on five representative freshwater and marine species, including microalgae, bivalves, crustaceans, and fish. Researchers found that even low concentrations of nanoplastics can cause oxidative stress, membrane damage, developmental disorders, and immune and nervous system dysfunction. The study highlights that particle size, concentration, aging status, and the presence of co-contaminants all influence toxicity, and calls for more research at environmentally realistic exposure levels.
Nanoplastics (NPs), particles smaller than 1 μm, are considered a significant threat to aquatic ecosystems due to their ability to penetrate tissues, bioaccumulate, and disrupt physiological functions. However, quantitative data on their chronic and environmentally relevant effects remain limited. This review combines findings from 128 studies (2014-2025) on the effects of nanoparticles in five representative freshwater and marine species: Scenedesmus obliquus (microalgae), Crassostrea gigas (bivalve), Apostichopus japonicus (echinoderm), Litopenaeus vannamei (crustacean), and Danio rerio (fish). Our analysis shows that exposure to NPs at low concentrations of 0.1-100 μg/mL can cause oxidative stress, membrane damage, developmental disorders, reproductive changes, and immune and nervous system dysfunction. Factors affecting the toxicity of NPs include particle size, concentration, type, and aging status, as well as duration of exposure, organism sensitivity, environmental conditions, and the presence of co-contaminants. Despite the increasing recognition of the effects of nanoplastics, quantitative data on their chronic and long-term effects, particularly at environmentally relevant exposure levels, remain scarce. This review highlights the urgent need for future research focusing on the mechanisms and processes of nanoparticle toxicity at ecologically realistic concentrations, as well as on the long-term ecological and physiological consequences for aquatic organisms.