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Assessing the size-dependent effects of microplastics on zebrafish larvae through fish lateral line system and gut damage
Summary
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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