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Assessing the size-dependent effects of microplastics on zebrafish larvae through fish lateral line system and gut damage
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Researchers exposed zebrafish larvae to high-density polyethylene microplastics in three size categories and assessed their effects on the fish sensory system and gut. They found that larger particles caused the most damage to the lateral line sensory system, while particles smaller than 100 micrometers were ingested and caused gastrointestinal tract changes. All sizes of microplastics altered larval swimming behavior, with distinct patterns depending on particle size.
This study evaluated the size-dependent effects of high-density polyethylene (HDPE) fragments in zebrafish. Larvae were exposed to HDPE microplastic (MP) in three sizes, small (14.12 μm), medium (80.32 μm), and large (120.97 μm), at 20 mg/L. Size-dependent effects in terms of MP intake, subsequent gut damage, and behavioral changes were observed. The results showed that HDPE exposure did not affect the survivability of zebrafish larvae but caused two significant changes. First, exposure to large MPs caused the most serious damage to hair cells and mechanosensory receptors in the fish's lateral line system. Second, exposure to MPs < 100 μm resulted in their ingestion by larvae, thereby causing morphological changes in the gastrointestinal tract. All larvae exposed to MPs showed behavioral pattern changes associated with size differences. This study improves our understanding of the effects of MPs on aquatic organisms and highlights the need to implement efficient strategies for plastic waste management.
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Differentiation in the expression of toxic effects of polyethylene-microplastics on two freshwater fish species: Size matters
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Researchers exposed zebrafish and perch to two sizes of polyethylene microplastics for 21 days and found that smaller particles were more toxic, accumulating primarily in the liver while larger ones concentrated in the gills. Both sizes triggered oxidative stress, DNA damage, and activated cell death pathways in both species. The study demonstrates that microplastic particle size is a key factor in determining where the particles end up in fish tissues and how severely they cause harm.
Size-dependent adverse effects of microplastics on intestinal microbiota and metabolic homeostasis in the marine medaka (Oryzias melastigma)
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Researchers exposed marine medaka fish to different sizes of polystyrene microplastics for 60 days and found that particle size was a key factor in determining health effects. Larger particles (200 micrometers) caused weight gain and fat accumulation, while smaller particles (2 and 10 micrometers) led to liver inflammation and damage. The study also revealed that microplastics disrupted the balance of gut bacteria, particularly with larger particle exposure.
Size dependent ingestion and effects of microplastics on survivability, hematology and intestinal histopathology of juvenile striped catfish (Pangasianodon hypophthalmus)
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Juvenile striped catfish exposed to different sizes of polyamide microplastics showed that smaller particles caused more damage than larger ones. The smaller microplastics led to greater reductions in growth, more severe changes in blood chemistry, and worse intestinal tissue damage. This size-dependent toxicity is important because as plastics break down in the environment they produce smaller particles that appear to be more harmful to aquatic organisms in the food chain.
Dietary Microplastic Administration during Zebrafish (Danio rerio) Development: A Comprehensive and Comparative Study between Larval and Juvenile Stages
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Researchers compared how zebrafish at different developmental stages respond to microplastics mixed into their feed, testing various particle sizes and concentrations. They found that larval fish were more sensitive than juveniles, and that smaller microplastics caused greater accumulation in the body. The study provides evidence that early life stages of fish are particularly vulnerable to dietary microplastic exposure, which is relevant for understanding contamination risks in aquaculture.
From particle size to brain function: a zebrafish-based review of micro/nanoplastic-induced neurobehavioral toxicity and mechanistic pathways
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This review uses zebrafish as a model to examine how micro- and nanoplastics cause neurobehavioral toxicity, linking particle size to brain function disruption. Researchers summarize evidence that these plastic particles impair fish behavior and cause molecular-level damage in the nervous system. The findings highlight the growing concern that micro- and nanoplastics are emerging neurotoxicants in aquatic environments.
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