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61,005 resultsShowing papers similar to Microplastic concentration and composition in surface waters and in stream-rearing Steelhead Trout (Oncorhynchus mykiss) in a rural coastal California stream
ClearMicroplastic data from surface waters and in stream-rearing steelhead trout (Oncorhynchus mykiss) in a rural coastal California stream
This dataset entry describes microplastic measurements from the water and the gut contents of juvenile steelhead trout in Scott Creek, a rural California coastal stream, providing baseline contamination data for a salmon-bearing watershed with minimal urban influence. Even in relatively pristine, low-traffic streams, microplastics are present and entering fish, suggesting contamination is pervasive in California waterways regardless of urbanization level. The data supports evaluation of ecological risks to native fish species that are already under pressure from other stressors.
Microplastics in brown trout (Salmo trutta Linnaeus, 1758) from an Irish riverine system
Microplastic prevalence and characteristics were assessed in brown trout (Salmo trutta) from an Irish riverine system to investigate plastic ingestion in a freshwater salmonid. The study found microplastics in a proportion of sampled fish, adding to the limited literature on microplastic ingestion in freshwater salmonids and highlighting rivers as an exposure pathway for these commercially important fish.
Microplastic data from surface waters and in stream-rearing steelhead trout (Oncorhynchus mykiss) in a rural coastal California stream
This is a duplicate dataset entry for the Scott Creek, California steelhead trout microplastics study (same as ID 1861), providing particle count, type, color, and size data from stream water and fish gut contents in a rural coastal watershed. Duplicate entry; the dataset offers baseline contamination data for a salmon-bearing stream in a relatively undisturbed California watershed.
Microplastics in juvenile Chinook salmon and their nearshore environments on the east coast of Vancouver Island
Researchers investigated microplastic ingestion in juvenile Chinook salmon and their nearshore marine environments on the east coast of Vancouver Island, finding microplastics present in both fish digestive tracts and surrounding waters and characterizing the types of particles consumed.
The Influence of Polystyrene Microplastics on Juvenile Steelhead Trout (Oncorhynchus mykiss)
This study investigated the effects of polystyrene microplastics on juvenile steelhead trout, a commercially and ecologically important anadromous fish. As top predators, steelhead are at particular risk from microplastic bioaccumulation through their prey, and the review highlights gaps in research compared to smaller model species. Understanding how microplastics affect large predatory fish is critical because these species are widely consumed by humans and play key roles in connecting freshwater and marine ecosystems.
The effect of urban point source contamination on microplastic levels in water and organisms in a cold‐water stream
Microplastic concentrations in water, macroinvertebrates, and trout in a Wisconsin stream increased significantly downstream of stormwater outfalls and a wastewater plant. The study demonstrates that point sources of pollution drive measurable increases in microplastic contamination in freshwater food webs.
Occurrence and characterization of microplastic content in the digestive system of riverine fishes
Researchers found microplastics in 93.8% of riverine fish examined, with polystyrene, polyethylene, and nylon being the most common polymer types concentrated near urban and industrial areas, and small particles (0.025-1 mm) predominating across species.
Characterization and enumeration of microplastic pollution in three fish species of the Upper Mississippi River
Researchers found 891 microplastic particles across 281 fish from three species in the Upper Mississippi River, with fibers being the most common type and smaller fish containing proportionally more microplastics than larger ones. This confirms microplastic ingestion is widespread in freshwater fish — not just marine species — and the presence of styrene-isoprene, polyester, and ABS polymers highlights the diverse plastic sources contaminating major river systems.
No evidence of spherical microplastics (10–300 μm) translocation in adult rainbow trout (Oncorhynchus mykiss) after a two-week dietary exposure
Rainbow trout were exposed to spherical microplastics ranging from 10 to 300 micrometers to determine whether particles translocate from the gut into body tissues in adult fish. No evidence of microplastic translocation from the gastrointestinal tract to systemic tissues was found, suggesting that fish gut removal before consumption reduces but may not eliminate human dietary microplastic exposure.
Decreased growth and survival in small juvenile fish, after chronic exposure to environmentally relevant concentrations of microplastic
Researchers exposed juvenile glassfish to environmentally realistic concentrations of both virgin and harbor-collected microplastics for 95 days, finding that fish in plastic-fed groups grew significantly less in length, depth, and mass, and had lower survival probability than controls.
Assessment of microplastic contamination in rainbow trout (Oncorhynchus mykiss) and surface water of a high-altitude aquaculture system in the Chehel Chai River, Iran
Researchers investigated microplastic contamination in both farmed rainbow trout and the surface water of the Chehel Chai River in Iran, finding microplastics in fish digestive tracts, gills, and skin. A total of 50 fish were analyzed, revealing widespread presence of plastic particles across all tissue types examined. The study raises concerns about microplastic transfer to humans through consumption of farmed fish from contaminated waterways.
Consumption of microplastic polyethylene terephthalate by juvenile salmon Oncorhynchus (Parasalmo) mykiss under artificial conditions
Researchers studied the effect of polyethylene terephthalate microplastics on juvenile Kamchatka steelhead (Oncorhynchus mykiss) under laboratory conditions, distributing 30 fish across control and treatment aquariums to assess ingestion and physiological impacts.
Evidence for the ‘growth-dilution’ of microplastics and microfibers in urban stream fish populations
Researchers assessed microplastic and microfiber accumulation in benthic macroinvertebrates and fish across five reaches of a polluted urban stream, finding evidence for a 'growth-dilution' effect in fish where increasing body size was associated with lower microplastic concentrations per unit tissue. The study estimated plastic quantities in prey resources and traced accumulation patterns through the stream food web.
Effects of a microplastic exposure gradient on juvenile lake trout (Salvelinus namaycush)
Researchers exposed newly hatched lake trout to a gradient of three microplastic types over 12 weeks, assessing growth, survival, and physiological biomarkers. Microplastic exposure caused dose-dependent effects on early life stage fish, with polymer type influencing the pattern of harm.
Microlitter measurement in fish Rutilus rutilus from the Slovenian part of the Mura river basin
Researchers examined the gastrointestinal tracts of 50 common roach caught from the Slovenian portion of the Mura River basin, conducting the first study of microlitter contamination in Slovenian freshwater fish and characterizing the abundance, morphology, and polymer types of ingested particles.
Microplastics pollution in freshwater fishes in the South of Italy: Characterization, distribution, and correlation with environmental pollutants
Researchers investigated the presence, abundance, and polymer composition of microplastics in the gastrointestinal tracts of freshwater fish from rivers in southern Italy, and evaluated correlations between microplastic ingestion and environmental pollutant levels. They found microplastics in multiple fish species, with fiber morphologies predominating, and identified associations between microplastic burden and co-occurring chemical contaminants in the sampled environments.
Comprehensive systematic review and meta-analysis of microplastic prevalence and abundance in freshwater fish species: the effect of fish species habitat, feeding behavior, and Fulton’s condition factor
A meta-analysis of freshwater fish across 42 studies found an average of 2.35 microplastic items per individual, with 80% of research focused on the gastrointestinal tract and 58% on river environments. Contrary to expectations, microplastic ingestion correlated with fish body physiology (size and weight) rather than feeding behavior or habitat, suggesting physical characteristics determine uptake more than ecological niche.
Natural history matters: Plastics in estuarine fish and sediments at the mouth of an urban watershed
Estuarine sediments in an urban California creek contained about 10,000 microplastic pieces per square meter, dominated by fibers, and nearly 25% of fish collected contained plastics, with species-specific ingestion patterns reflecting different natural histories. The study also found multiple semivolatile organic compounds in fish tissue, suggesting plastic ingestion co-occurs with chemical contamination in urban estuaries.
Effects of a microplastic exposure gradient on juvenile lake trout (Salvelinus namaycush)
Researchers exposed newly hatched lake trout for 12 weeks to three types of microplastics, polyethylene, polystyrene, and polyethylene terephthalate, at a gradient of concentrations to assess effects on early life stages of this important sportfish. Microplastic exposure caused growth and developmental effects in juvenile lake trout, with responses varying by polymer type and concentration.
A systematic study of the microplastic burden in freshwater fishes of south-western Germany - Are we searching at the right scale?
A comprehensive survey of 1,167 freshwater fish from 22 species across 11 rivers and 6 lakes in southwestern Germany found an apparent microplastic prevalence of 18.8%, but particle size analysis revealed that over 95% of particles were likely smaller than the 40 μm detection limit, suggesting true prevalence may reach 100% with an average of ~23 particles per fish. The findings challenge the validity of most existing microplastic surveys in fish, which miss the smallest and most abundant fraction.
Microplastic characterization in small freshwater fishes collected in Gyeongan-cheon, a tributary stream of Han River in South Korea: Ingestion and depuration study of Nylon
Researchers characterized microplastic distribution in freshwater fishes from Gyeongan-cheon, a Han River tributary in South Korea, finding 34-284 particles per individual with fibers and fragments predominating, and conducted nylon ingestion and depuration experiments to assess clearance rates.
Microplastic and tire wear particle occurrence in fishes from an urban estuary: Influence of feeding characteristics on exposure risk
Researchers surveyed microplastics in the digestive tracts of five fish species from an urban estuary and found plastic particles in 99% of specimens, averaging 27 particles per fish. Atlantic Menhaden had the highest contamination relative to body weight, likely due to their habit of ingesting marine snow aggregates. The study also found suspected tire wear particles in 14% of individual fish, providing the first evidence of tire particle consumption in field-collected organisms.
Microplastic occurrence in the gastrointestinal tract and gill of bioindicator fish species in the northeastern Mediterranean
Four commercial fish species from the northeastern Mediterranean were examined for microplastic presence in gastrointestinal tracts and gills, with plastics found in all species and fiber being the most common type. The results add to growing evidence that microplastic ingestion is routine for commercially harvested Mediterranean fish.
Microplastic loads within riverine fishes and macroinvertebrates are not predictable from ecological or morphological characteristics
Researchers measured microplastic loads in riverine fish and macroinvertebrates and found that particle counts were not reliably predicted by species ecology or morphology, suggesting that individual variation and local environmental factors play a larger role in microplastic ingestion than feeding guild or habitat alone.