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Microplastic's triple threat
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A brief research summary describes how Eurasian perch larvae exposed to microplastics became less active, stopped responding to predator cues, and preferred eating plastic over natural prey. The study demonstrated that microplastics have multiple compounding harmful effects on fish behavior and survival.
Ecotoxicology The billions of tons of plastics that we release into the environment for the most part do not biodegrade. But they do degrade, breaking into ever smaller particles that end up in the oceans. Lonnstedt et al. show that the impacts of these microplastics are multifold (see the Perspective by Rochman). Eurasian perch larvae exposed to microplastics were less active, less responsive to predator cues, more likely to be eaten, and less likely to thrive—preferring to eat plastic rather than their natural prey. ![Figure][1] Perch larvae will consume microplastics. PHOTO: OONA LONNSTEDT Science , this issue p. [1213][2]; see also p. [1172][3] [1]: pending:yes [2]: /lookup/doi/10.1126/science.aad8828 [3]: /lookup/doi/10.1126/science.aaf8697
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Microplastics stunt fish growth and alter behavior
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A study of European perch larvae found that high levels of polystyrene microplastics inhibited hatching, stunted growth, and made fish more likely to be eaten by predators. These findings raised serious concern about microplastic impacts on fish populations and the marine food supply that humans depend on.
Fish larvae feeding on microplastic particles display altered behavior
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Larval perch exposed to polystyrene microplastics showed stunted growth and altered feeding behavior, choosing microplastic particles over natural prey. These findings from Uppsala University researchers were among the first to demonstrate that microplastic exposure can change the behavior and development of larval fish, with implications for fish population survival.
Exposure to microplastics impairs fish's major behaviors. A novel threat to aquatic ecosystem
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This review synthesises evidence on how microplastic exposure alters key behaviours in fish including feeding, reproduction, predator avoidance, and social interaction. It identifies neurological disruption, chemical co-toxicity, and gut effects as primary mechanisms, and highlights exposure to realistic environmental concentrations as an ongoing knowledge gap.
Microplastic Vector Effects: Are Fish at Risk When Exposed via the Trophic Chain?
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Three-spined sticklebacks exposed to chlorpyrifos-contaminated microplastics via a trophic chain accumulated the pesticide in their bodies and showed inhibited acetylcholinesterase activity and hyperactivity, a behavioral change that could increase vulnerability to predators. The study confirms that microplastics can deliver contaminants to fish and alter organ distribution of chemicals compared to direct water exposure.
Effects of microplastics on the feeding rates of larvae of a coastal fish: direct consumption, trophic transfer, and effects on growth and survival
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Researchers tested whether microplastics in seawater affect the feeding rates, growth, and survival of California Grunion fish larvae. They found that microplastics reduced feeding rates and demonstrated that trophic transfer of microplastics from zooplankton to larval fish occurs readily. The study suggests that microplastic pollution may impair early fish development by interfering with feeding behavior and introducing contaminants through the food chain.
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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.