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Primary and secondary microplastics do not affect hatching of Japanese flounder eggs
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Researchers investigated the effects of primary polystyrene microbeads (3 and 10 micrometers) and secondary microplastics derived from coastal debris on the hatching rates of Japanese flounder eggs, finding that neither primary nor secondary microplastics affected hatching success, suggesting limited impact during this brief early developmental stage.
Abstract Microplastics (MPs) are pervasive pollutants that may threaten aquatic organisms, especially during early life stages. This study investigated effects of MPs on the hatching rate of Japanese flounder eggs. Fertilized eggs were exposed to polystyrene (PS) microbeads (primary microplastics) (3 and 10 µm, at 20 and 200 particles/m l ), and secondary MPs derived from coastal debris (rope, plastic bottles, fish net, string, and rubber pads) collected in Nagasaki, Japan. Hatching rates of flounder eggs were unaffected by either primary or secondary microplastics, suggesting limited impact of microplastics on this brief developmental stage.
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Assessing the impact of suspended irregular microplastics on the mortality of herring and cod eggs
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Researchers exposed herring and cod eggs—two commercially and ecologically important North Sea species—to environmentally relevant concentrations of suspended irregular microplastics and measured mortality rates. Even at realistic environmental concentrations, certain microplastic shapes caused elevated egg mortality, providing direct evidence that early fish life stages are physically vulnerable to microplastic pollution.
Assessing the effect of microplastics on marine invertebrates: the consequence of exposure of sea urchin larvae to polystyrene microplastics
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Researchers exposed sea urchin larvae (Paracentrotus lividus) to polystyrene microplastics derived from commercial disposable plates and assessed effects on fertilization, embryogenesis, and larval development, finding significant impairment of early developmental stages at environmentally relevant concentrations.
Exposure to microplastic fibers does not change fish early life stage development of three-spined sticklebacks (Gasterosteus aculeatus)
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Exposure of three-spined stickleback eggs and larvae to microplastic fibers at environmentally relevant concentrations had no significant effect on fertilization success, hatching rates, embryonic survival, or early larval development, suggesting that microplastic fibers alone may not impair early life stages of this species under realistic conditions.
Microplastics negatively impact embryogenesis and modulate the immune response of the marine medaka Oryzias melastigma
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Researchers exposed marine medaka embryos (Oryzias melastigma) to polystyrene microplastics at varying concentrations and found dose-dependent developmental toxicity, including reduced hatching rates and altered immune gene expression, providing mechanistic insight into early-life MP effects.
Toxicity assessment of pollutants sorbed on environmental microplastics collected on beaches: Part II-adverse effects on Japanese medaka early life stages
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Environmental microplastics collected from Pacific island beaches were tested on Japanese medaka embryos and prolarvae, with particles from Easter Island, Guam, and Hawaii causing significant mortality, developmental malformations, EROD enzyme induction, and DNA damage compared to virgin plastics. The study demonstrates that beach-collected microplastics carrying environmental pollutants are significantly more toxic than virgin particles to fish early life stages.
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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.