We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Chronic dietary exposure to polystyrene microplastics in maturing Japanese medaka (Oryzias latipes)
AI summary Read the abstract
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.
Fish studies report consumption of microplastics (MPs) in the field, and concern exists over associated risks. However, laboratory studies with adult fish are scarce. In this study, outbred and see-through Japanese medaka (Oryzias latipes) were fed diets amended with 500, 1000, or 2000 μg/g 10 μm fluorescent spherical polystyrene microplastics (MPs) for 10 weeks during their maturation from juveniles to spawning adults. No behavioral changes, growth differences, or mortalities occurred. In vivo examinations and histologic sections showed no evidence of translocation of MPs from the gut to other internal organs. Mature females experienced dose-dependent decreases in egg number. Scanning electron microscopic examination of gills and gut revealed MPs in both areas. Swollen enterocytes were observed on apices of gut folds only in exposed fish. These were particularly apparent in foreguts of the high exposure group. Enterocytes with eroded brush borders were found in foregut of high and medium exposure groups. Increased mucus production, in long strands and sheets, was seen over primary and secondary lamellae of gills. Histological analysis showed alteration in buccal cavity, kidney, and spleen. Thickening and roughening of epithelium in headgut and pharynx and cellular alterations in spleen occurred. Head kidney was the primary site of alteration. Glomerulopathy and nephrogenesis were observed in exposed fish, increasing in severity with exposure level.
More Papers Like This
Polystyrene microplastics cause tissue damages, sex-specific reproductive disruption and transgenerational effects in marine medaka (Oryzias melastigma)
AI summary Read the abstract
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.
Developmental Polyethylene Microplastic Fiber Exposure Entails Subtle Reproductive Impacts in Juvenile Japanese Medaka (Oryzias latipes)
AI summary Read the abstract
Japanese medaka fish exposed to environmentally relevant levels of polyethylene microplastic fibers throughout development showed subtle but measurable reproductive impacts including alterations in gonadal development. The findings suggest that chronic low-dose microplastic fiber exposure during early life may impair future reproductive capacity in fish.
Bioaccumulation and reproductive effects of fluorescent microplastics in medaka fish
AI summary Read the abstract
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.
Effects of life cycle exposure to polystyrene microplastics on medaka fish (Oryzias latipes)
AI summary Read the abstract
Researchers exposed medaka fish to irregularly shaped polystyrene microplastics for 150 days across their life cycle and found that while growth and reproduction were largely unaffected, the study highlights the importance of using environmentally realistic particle shapes and sizes in long-term exposure studies.
Adaptation of life-history traits and trade-offs in marine medaka (Oryzias melastigma) after whole life-cycle exposure to polystyrene microplastics
AI summary Read the abstract
Researchers conducted a whole-life-cycle exposure of marine medaka to polystyrene microplastics and observed effects on hatching, growth, and reproduction across generations. Microplastics accumulated on eggshells, reduced hatching rates and larval body length, and altered reproductive investment strategies. The study suggests that chronic microplastic exposure can trigger life-history trade-offs in fish, potentially affecting population dynamics over multiple generations.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.