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Preliminary study on the behavioral response of zebrafish to the presence of methionine and polypropylene residues in water
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This study examined how zebrafish behaved when exposed to polypropylene plastic particles and the amino acid methionine in water. The research contributes to understanding how microplastics affect the nervous system and behavior of aquatic animals, which can serve as indicators of environmental pollution risk.
When it comes to pollutants in the aquatic environment, there is a wide variety of products, from fibers and plastics to food and medicinal compounds and their by-products. Pollutants have been an area of interest for decades and are becoming more popular with each passing year, whether their presence and effects are studied separately by class or in combination. Among all, polymeric materials are in the center of attention, and their presence in the environment has long been established with studies on their harmful effects. Improper disposal of pharmaceutical materials is just one of many ways that lead to their accumulation in water and soil. The worldwide spread in the environment of polymeric materials, as well as pharmaceutical pollutants is described by the literature, but also the effects of these two materials separately in terms of the behavior of zebrafish (Danio rerio). In this paper, we studied the "joint effect" of one polymeric material (polypropylene) and one pharmaceutical product (methionine - one of the essential aminoacids of the body, with antioxidant properties and multiple uses in the pharmaceutical field). Although we did not find many significant differences in terms of behavior, one aspect worth noting was the anxiolytic-like effect of microplastic on the social, and stress related behavior of zebrafish.
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Researchers evaluated the toxicological effects of chemical extracts leached from microplastics on zebrafish behavior using light-dark preference and startle response tests. The study found that microplastic leachates altered fish behavioral patterns, indicating that chemicals released from degraded plastics can have measurable neurobehavioral effects on aquatic organisms.
Microplastics Lead to Hyperactive Swimming Behaviour in Adult Zebrafish
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Researchers exposed adult zebrafish to polystyrene microplastics across a wide concentration range and found that microplastics accumulated primarily in the gastrointestinal tract and gills. The study revealed that exposed fish exhibited hyperactive swimming behavior, suggesting that microplastic ingestion can affect locomotor activity even without obvious physical damage to internal organs.
Neurobehavioral and neurochemical effects of nano-sized polypropylene accumulation in zebrafish (Danio rerio)
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Researchers exposed zebrafish to polypropylene nanoparticles and confirmed the particles accumulated in brain tissue using advanced imaging and chemical analysis. The accumulation led to measurable neurotoxic effects, including reduced movement activity and disrupted neurotransmitter levels. The study suggests that nanoscale polypropylene, one of the most commonly produced plastics, may pose risks to nervous system function in aquatic organisms.
Toxicity and behavioral response of zebrafish exposed to combined microplastic and bisphenol analogues
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Co-exposure of zebrafish larvae to polystyrene microplastics combined with bisphenol A or F increased larval lethality by 7–51% compared to either pollutant alone, while also causing stronger behavioral effects including reduced movement and activity. This synergistic toxicity — not seen in embryos — highlights the danger of treating microplastics and chemical contaminants as independent hazards, since real-world exposures are always mixed.
Behavioural impact of microplastics on zebrafish development
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Researchers assessed the developmental effects of environmentally relevant, household-derived microplastic fragments on zebrafish, rather than the pristine polymer spheres typically used in lab studies. While exposure did not cause embryonic death or gross malformations, the study found significant sublethal effects including reduced touch-evoked escape responses in larvae, suggesting behavioral impacts from realistic microplastic exposure.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.