We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Ingestion, egestion and post-exposure effects of polystyrene microspheres on marine medaka (Oryzias melastigma)
AI summary Read the abstract
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.
Microplastics (MPs) are of environmental concern due to their bioavailability and potential impacts on a wide range of marine biota. In this study, we investigated the ingestion, bioaccumulation and egestion of fluorescent polystyrene (PS) micospheres (10 μm) in both larvae and adults of marine medaka (Oryzias melastigma), with or without food supply. The post-exposure effects of non-fluorescent PS (10 μm) on the survival, growth and reproduction of medaka larvae were also explored. Results showed that the PS microspheres could be ingested by both larvae and adults during the 48 h-exposure. Notably, feeding status was found to significantly affect the ingestion in medaka adults, which was not observed in the larvae. The egestion process of PS was rapid during the first recovery day but there was still certain percent of particles retained in digestive tracts at the end of 7 d recovery for either larvae or adults. After a 14 d pre-exposure with the non-fluorescent PS microspheres, the subsequent survival, growth and reproduction of medaka larvae were all significantly affected at the end of 120 d of experiment without PS. Overall, these results indicate that fishes might ingest or retain more MPs if the environmental abundance of MPs continues to increase while the available food decreases. Medaka fishes in larval stage have no capacity to select natural food sources like the adults. The chronic and "legacy effect" of MPs might also be a problem worthy paid more attention in future research instead of acute and immediate effect studies.
More Papers Like This
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.
Short-term microplastic exposure in fish larvae: The ingestion, elimination, and initial effect on japanese medaka (Oryzias latipes) larvae
AI summary Read the abstract
Japanese medaka larvae were exposed to microplastics in short-term experiments to assess ingestion rates, elimination timelines, and initial toxic effects including growth impacts. The study provides early-life-stage toxicity data for fish, a relatively understudied phase in microplastic risk assessment.
Size-dependent adverse effects of microplastics on intestinal microbiota and metabolic homeostasis in the marine medaka (Oryzias melastigma)
AI summary Read the abstract
Researchers exposed marine medaka fish to different sizes of polystyrene microplastics for 60 days and found that particle size was a key factor in determining health effects. Larger particles (200 micrometers) caused weight gain and fat accumulation, while smaller particles (2 and 10 micrometers) led to liver inflammation and damage. The study also revealed that microplastics disrupted the balance of gut bacteria, particularly with larger particle exposure.
Polystyrene microplastics alter the intestinal microbiota function and the hepatic metabolism status in marine medaka (Oryzias melastigma)
AI summary Read the abstract
Researchers fed marine medaka fish polystyrene microplastics of two sizes for 28 days and examined effects on gut microbiota and liver metabolism. They found that microplastic exposure significantly altered the functional composition of gut bacteria and disrupted hepatic metabolic pathways, even without causing visible tissue damage. The study suggests that microplastics can affect fish health through subtle microbiome and metabolic changes that precede obvious physical harm.
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.