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61,005 resultsShowing papers similar to Comparison of microplastic intake in two fish species from different functional feeding groups in Europe's second-largest river
ClearMicroplastics in the Danube River and Its Main Tributaries—Ingestion by Freshwater Macroinvertebrates
Researchers measured microplastic concentrations in the Danube River and its major tributaries and analyzed ingestion by freshwater fish species collected from multiple sites. Microplastics were detected in a significant proportion of fish, with ingestion rates correlating with local plastic contamination levels, documenting widespread plastic exposure across the Danube watershed's fish communities.
Isolation of Microplastics from Freshwater Macroinvertebrates in the Danube River
Researchers isolated microplastics from three freshwater species — mollusks, worms, and midge larvae — collected from the Danube River during a major scientific survey. Using different organism types as biological monitors showed that microplastic contamination is widespread in the river's aquatic ecosystem.
Microplasic measurements at the Danube river using a multi-level approach
Researchers measured microplastics in the Danube River using multiple sampling approaches at different scales, confirming that microplastics are present throughout the water column. Finer-scale analysis consistently revealed more particles than coarser methods. The findings support the use of multi-level sampling strategies to accurately assess microplastic contamination in major river systems.
Quantitative and qualitative analysis of microplastic pollution in a large European river
Researchers sampled the Budapest reach of the Danube River at multiple water column depths using a Multilevel Manta net, finding an average microplastic concentration of 0.311 mg/m³ (142 particles/m³) dominated by polystyrene, polyethylene, and polypropylene fragments, and estimating substantial microplastic mass flux that underscores the Danube's role as a major transport pathway for plastic pollution.
Evidence of microplastic contamination in Alosa immaculata fish from the Lower Danube River
Researchers examined microplastic contamination in the guts and gills of pontic shad (Alosa immaculata) caught from the lower Danube River, finding an average of 1.35 microplastic particles per fish in the digestive tract and 0.5 particles per fish in the gills. The dominant plastics were polyethylene, polypropylene, and polyester — common packaging and textile materials — confirming that river fish in Eastern Europe are routinely ingesting plastic debris.
Microplastics in freshwater fish from Central European lowland river (Widawa R., SW Poland)
More than half of gudgeon and roach fish collected from a small Polish river had ingested microplastic-like particles, with no significant difference by sex, feeding behavior, or location relative to a dam. The findings suggest microplastic ingestion by freshwater fish is widespread and not driven by a single local source.
The first observation of the presence of microplastics in wild common bleak (Alburnus alburnus L.) and standardization of extraction protocols
Researchers studied microplastic contamination in the digestive tracts, muscle tissue, and whole bodies of common bleak fish from a Serbian reservoir, comparing different extraction protocols. The study provides first evidence of microplastics in this species while also developing cost-effective extraction methods.
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.
Two decades of plastic exposure in freshwater fishes from Romania
Researchers reviewed two decades of microplastic contamination records in freshwater fish from Romania, finding increasing prevalence over time across multiple species and identifying ingestion, trophic transfer, and bioaccumulation as the primary exposure pathways.
The first spatio-temporal study of the microplastics and meso–macroplastics transport in the Romanian Danube
This study measured microplastic transport in the Romanian section of the Danube River over multiple seasons, estimating up to 51 tonnes of microplastics flow through per year. Polyethylene and polypropylene were the most common types, and concentrations varied with seasonal water flow. Since the Danube supplies drinking water and supports fisheries for millions of people, this contamination level raises concerns about human exposure.
Eco Toxicological Assessment of Micro Plastic Ingestion in Freshwater Fishes: A Case Study on Bioaccumulation and Histopathological Alterations
Researchers assessed microplastic accumulation in three freshwater fish species (tilapia, rohu, catla) from a major river system, finding microplastics in gastrointestinal tracts and associated histopathological damage in gills, liver, and kidneys.
Microplastic occurrence in coastal waters and aquatic faunas of the Western Black Sea
Researchers assessed microplastic occurrence in coastal waters and aquatic fauna of the Western Black Sea region receiving Danube River inputs, characterizing MP distributions in a coastal ecosystem under pressure from tourism, fishing, regional conflicts, and inadequate waste disposal across the Danube basin.
Presence of microplastic in the digestive tracts of European flounder, Platichthys flesus, and European smelt, Osmerus eperlanus, from the River Thames
Researchers found microplastics in the digestive tracts of both European flounder and European smelt from the River Thames in London, with occurrence rates reflecting the fish's benthic versus pelagic feeding habits. The study demonstrates that fish in heavily urbanized river systems are exposed to microplastic contamination through their diet.
Microplastics in Austrian rivers
This German-language review summarizes published research on microplastic contamination in Austrian rivers, with a focus on the Danube. The paper compares findings across studies, identifies methodological inconsistencies, and recommends improvements to sampling and identification approaches for future river microplastic monitoring.
Assessment of Different Sampling, Sample Preparation and Analysis Methods Addressing Microplastic Concentration and Transport in Medium and Large Rivers Based on Research in the Danube River Basin
Monitoring microplastics in rivers is hampered by the lack of standardized methods, making it difficult to compare results across studies. This research tested three common sampling approaches on the Danube River and its tributaries, finding that each method produced meaningfully different estimates of microplastic concentrations and transport. The results underscore the urgent need for agreed-upon protocols so that data from different countries and research groups can be reliably combined to track river-to-ocean plastic pollution.
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.
Evidence of microplastic contamination in the food chain: an assessment of their presence in the gastrointestinal tract of native fish
Researchers found microplastics, mainly polyethylene and polypropylene, in the guts of fish from the Swat and Kabul rivers in Pakistan. These rivers are primary freshwater sources for the region, and the contaminated fish are regularly consumed by local communities. The findings confirm that freshwater fish from polluted rivers are a pathway for microplastic exposure in people's diets.
Independence of microplastic ingestion from environmental load in the round goby (Neogobius melanostomus) from the Rhine river using high quality standards
This study found that the amount of microplastics ingested by round goby fish was not closely linked to the concentration of microplastics in their local environment, suggesting individual variability or selective feeding plays a role. The findings complicate efforts to use fish ingestion rates as a direct proxy for environmental microplastic levels.
Microplastic Uptake in Fishes from Crișul Repede River (Bihor County, Romania): A Preliminary Study
Researchers found that 100% of fish caught from a Romanian river had tiny plastic particles in their stomachs, with larger fish containing more plastic pieces than smaller ones. These microplastics can move up the food chain from fish to humans when we eat them, potentially causing health problems. This study shows how widespread plastic pollution has become in our waterways and food supply.
Prevalence of microplastics in commonly consumed fish species of the river Old Brahmaputra, Bangladesh
Researchers found microplastics in nearly 59% of edible fish from Bangladesh's Old Brahmaputra river, with polyethylene fibers and pellets dominating, and ingestion rates linked to fish size, feeding behavior, and downstream location.
Sedimentary microplastic concentrations from the Romanian Danube River to the Black Sea
Researchers measured microplastic concentrations in sediments along the Danube River through the Danube Delta and into the Black Sea, finding that some isolated areas of the Delta still had relatively few plastic particles. The study helps clarify how microplastics move from major rivers into the ocean, an important step for estimating global ocean plastic loads.
Occurrence and exposure analysis of microplastic in the gut and muscle tissue of riverine fish in Kermanshah province of Iran
Researchers analyzed microplastic contamination in the gut and muscle tissue of fish from the Qarasu River in Iran, finding microplastics in all species examined. The estimated human dietary intake through fish consumption was calculated at approximately 174 and 127 particles per kilogram of body weight per year for adults and children respectively, highlighting the potential for microplastic exposure through food.
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.
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.