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Microplastic consumption elevates fish oxidative stress but does not affect predator-driven mortality
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Juvenile coral reef fish exposed to polystyrene microplastics for just two days showed increased oxidative stress and cellular damage, especially when the plastics contained the common plasticizer DEHP. However, the microplastic exposure did not affect the fish's ability to escape predators in short-term trials. The study highlights that microplastics may cause hidden health damage to marine organisms even when they appear to function normally.
The ubiquity and abundance of plastic debris is one of the most significant challenges facing marine environments. Recent research has demonstrated that microplastics are consumed by marine organisms from a wide variety of trophic levels. However, little is known about the sub-lethal effects of microplastic exposure on the health of coral reef fishes or their impacts on predator-prey interactions. To examine this, we exposed juvenile Ambon damselfish (Pomacentrus amboinensis) to one of two types of polystyrene plastic particles (virgin, or with the plasticizer di(2-ethylhexyl) phthalate - DEHP), and a control (no plastic). After 2 days (6 exposures), the initiation of antioxidant metabolism and oxidative defence was quantified. We also exposed the treated juvenile fish to a piscivorous fish (Pseudochromis fuscus) in mesocosms over a 22-h period to investigate whether microplastic exposure affected prey survival. Biomarkers associated with oxidative damage and antioxidant metabolism indicated that microplastic exposure had a negative effect on the health of P. amboinensis. Additionally, P. amboinensis exposed to DEHP microplastics showed the greatest levels of oxidative stress and damage, however the magnitude of this was dependent on the number of ingested particles. Interestingly, survival of P. amboinensis did not differ among plastic treatments during mesocosm survival trials. These results highlight that while studies may not find immediate lethal consequences to plastic ingestion, there may be more subtle sub-lethal costs that may have ecologically important consequences at later life stages, through energetic impacts on growth and energy allocation.
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Damselfish in distress after consuming plastic
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This study found that damselfish consuming plastic containing the plasticizer DEHP experienced elevated reactive oxygen species, reduced antioxidant capacity, and behavioral disruptions — suggesting both chemical toxicity and physical blockage contribute to plastic's harm to reef fish.
Chronic LDPE microplastic ingestion: oxidative stress and mutagenicity in reef fish Stegastes fuscus
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Researchers fed reef damselfish a diet containing low-density polyethylene microplastics for four months and observed increased DNA damage in blood cells and elevated oxidative stress markers in the brain. While the fish showed no changes in behavior, the cellular-level damage points to real biological harm from chronic microplastic ingestion. The findings highlight a hidden threat to reef fish health that could have cascading effects on coral reef ecosystems.
Exposure to polypropylene microplastics via diet and water induces oxidative stress in Cyprinus carpio
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Researchers fed carp fish polypropylene microplastics through both food and water and found that exposure caused oxidative stress in the liver, gills, and intestines. The damage was dose-dependent, with higher microplastic concentrations causing more harm to the fish's antioxidant defense systems. Since carp is a widely consumed fish, these findings raise questions about whether microplastics in aquaculture could affect the safety of fish as human food.
Size-dependent internalization of micro- and nanoplastics induces pro-inflammatory and oxidative stress responses in marine and freshwater fish cell lines
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Scientists found that tiny plastic particles (microplastics) can slip inside fish cells and trigger inflammation and stress responses, even though the cells didn't die. Smaller particles got in more slowly but still caused problems, suggesting that as plastics break down into smaller pieces in the environment, they may still be harmful even if they don't kill cells outright. Since we eat fish and are exposed to similar tiny plastics ourselves, this research hints that microplastics could be quietly stressing our cells too, even without obvious damage.
Microplastic exposure interacts with habitat degradation to affect behaviour and survival of juvenile fish in the field
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Juvenile coral reef fish pulse-fed polystyrene microplastics and then released onto live or degraded coral patches became bolder, more active, and strayed farther from shelter — with microplastic exposure having a larger behavioral effect than habitat degradation — potentially increasing predation risk in the field.
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