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Bioaccumulation and reproductive effects of fluorescent microplastics in medaka fish
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This study exposed both freshwater and marine medaka fish to fluorescent polystyrene microplastics for three weeks, finding bioaccumulation in multiple tissues and reduced reproductive output in freshwater medaka, with bioaccumulation factors differing between the two species.
This study was performed to elucidate the uptake and bioaccumulation of polystyrene microplastics (PS-MPs) in Japanese medaka (freshwater fish) and Java medaka (marine fish), and to assess its impacts on the survival, reproduction, and gene expression of Japanese medaka. Both species were exposed to 2-μm fluorescent PS-MPs (10 beads/L) for 3 weeks. The bioaccumulation factor of PS-MPs for Java medaka was calculated at about 4 × 10, higher than that for Japanese medaka (about 1 × 10). The exposure had no significant effects on the survival and reproduction of Japanese medaka. The mRNA sequencing analysis showed that the expression of a few genes involved in the cell adhesion, xenobiotic metabolic process, brain development, and other functions in medaka intestines significantly changed after exposure. These results suggest that virgin PS-MPs can potentially accumulate in medaka intestines, but has limited toxicity to Japanese medaka at the concentration up to 10 beads/L.
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Chronic dietary exposure to polystyrene microplastics in maturing Japanese medaka (Oryzias latipes)
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Japanese medaka fish were fed diets containing polystyrene microplastics for 10 weeks during maturation, finding no tissue translocation or behavioral changes but a dose-dependent decrease in egg production in mature females. The results suggest chronic dietary MP exposure may impair reproduction even without systemic distribution.
Polystyrene microplastics cause tissue damages, sex-specific reproductive disruption and transgenerational effects in marine medaka (Oryzias melastigma)
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Researchers exposed marine medaka fish to environmentally realistic concentrations of polystyrene microplastics and found tissue damage, oxidative stress, and sex-specific reproductive disruption. The effects carried over to the next generation even without direct microplastic exposure. The study provides evidence that microplastics at levels found in the ocean can cause lasting biological harm across generations in fish.
Uptake and depuration kinetics of microplastics with different polymer types and particle sizes in Japanese medaka (Oryzias latipes)
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Researchers studied the uptake and depuration kinetics of microplastics with different polymer types and sizes in Japanese medaka fish. They found that smaller particles accumulated more readily in fish tissues and were retained longer than larger ones, with particle distribution varying by organ. The study provides important quantitative data on how microplastic characteristics influence their accumulation and clearance in fish, which is relevant to understanding food chain transfer.
Ingestion, egestion and post-exposure effects of polystyrene microspheres on marine medaka (Oryzias melastigma)
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Researchers studied how marine medaka fish ingest, accumulate, and egest polystyrene microspheres, finding that both larvae and adults readily consumed the particles during a 48-hour exposure. While fish cleared most particles within a day of recovery, some remained in their digestive tracts after a full week. Notably, larvae exposed to microplastics for just 14 days showed significant long-term effects on survival, growth, and reproduction over the following 120 days, suggesting lasting legacy effects from early microplastic exposure.
Polystyrene microplastics increase estrogenic effects of 17α-ethynylestradiol on male marine medaka (Oryzias melastigma)
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Researchers found that polystyrene microplastics increased the estrogenic effects of 17a-ethynylestradiol in male marine medaka, with co-exposure at higher MP concentrations causing greater reproductive disruption than the estrogen alone.
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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.