We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Do polystyrene microplastics affect juvenile brown trout (Salmo trutta f. fario) and modulate effects of the pesticide methiocarb?
Summary
Researchers exposed juvenile brown trout to polystyrene microplastics and the pesticide methiocarb, both alone and in combination. Neither microplastics alone nor the combination produced significant effects beyond what the pesticide caused by itself, but the study provides important baseline data on microplastic-pesticide interactions in a commercially important freshwater fish species.
Abstract Background During the last decade, there has been rising interest of the scientific community and the public in the environmental risk related to the abundance of microplastics in aquatic environments. Besides potential effects of the particles themselves, also their interaction with organic micropollutants is of particular concern. Up to now, however, scientific knowledge in this context is scarce and insufficient for a reliable risk assessment. This is especially true for data on microplastics in freshwater ecosystems.Results Against the background of this shortage, we investigated possible adverse effects of polystyrene particles (10 4 particles/L) and the pesticide methiocarb (1 mg/L) both alone as well as in combination in juvenile brown trout ( Salmo trutta f. fario ) after a 96 h laboratory exposure. PS beads (density 1.05 g/mL) were cryogenically milled and fractionated resulting in irregular shaped particles (<50 µm). Besides body weight of the animals, biomarkers for proteotoxicity (stress protein family Hsp70), oxidative stress (superoxide dismutase, lipid peroxidation) and neurotoxicity (acetylcholinesterase, carboxylesterases) were analysed. As an indicator of overall health histopathological effects were studied in liver and gills of exposed fish. Polystyrene particles alone did not influence any of the investigated biomarkers. In contrast, the exposure to methiocarb led to a significant reduction of the activity of acetylcholinesterase and the two carboxylesterases. Moreover, the tissue integrity of liver and gills was impaired by the pesticide. Body weight, the oxidative stress and the stress protein levels were not influenced by methiocarb. Effects caused by the mixture of polystyrene microplastics and methiocarb were the same as those caused by methiocarb alone.Conclusions Overall, methiocarb led to strong effects in juvenile brown trout. In contrast, polystyrene microplastics in the tested concentration did not negatively affect the health of juvenile brown trout and did not modulate the toxicity of methiocarb in this fish species.
Sign in to start a discussion.
More Papers Like This
Polystyrene microplastics do not affect juvenile brow trout (Salmo trutta f. fario) or modulate effect of the pesticide methiocarb
A controlled experiment exposing juvenile brown trout to polystyrene microplastics alone or combined with the pesticide methiocarb found no significant adverse effects on fish health or behavior at the tested concentrations. The results suggest that polystyrene microplastics may not amplify the toxicity of this pesticide in salmonid fish under short-term exposure.
Polystyrene microplastics do not affect juvenile brown trout (Salmo trutta f. fario) or modulate effects of the pesticide methiocarb
Juvenile brown trout exposed to polystyrene microplastics for 96 hours showed no effects on any measured biomarker, but the pesticide methiocarb caused significant acetylcholinesterase inhibition, tissue damage in liver and gills, and impaired enzyme activity. Combining microplastics with methiocarb did not amplify the pesticide's effects, suggesting these pollutants do not interact toxicologically in juvenile trout.
Toxicity of polystyrene microplastics on juvenile Oncorhynchus mykiss (rainbow trout) after individual and combined exposure with chlorpyrifos
Researchers tested the effects of pristine and chlorpyrifos-loaded polystyrene microplastics on juvenile rainbow trout, examining tissue damage and physiological responses. They found that microplastics carrying the pesticide caused more severe histopathological changes in the gills and liver than either contaminant alone. The study provides evidence that microplastics can act as vectors for pesticides, amplifying their toxic effects on freshwater fish.
Interacting Effects of Polystyrene Microplastics and the Antidepressant Amitriptyline on Early Life Stages of Brown Trout (Salmo trutta f. fario)
When brown trout eggs and larvae were exposed to polystyrene microplastics alone, there were no significant developmental or biochemical effects, but the antidepressant amitriptyline caused serious developmental harm and behavioral changes. Microplastics did not modify the toxicity of amitriptyline, suggesting the two pollutants do not interact in this species.
Combined polystyrene microplastics and chlorpyrifos decrease levels of nutritional parameters in muscle of rainbow trout (Oncorhynchus mykiss)
Researchers exposed rainbow trout to polystyrene microplastics combined with the pesticide chlorpyrifos and found that the combination significantly reduced key nutritional parameters (protein, lipid, and moisture content) in muscle tissue compared to either contaminant alone.