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Characterization of weathered microplastics in freshwater and fish from the Central Himalayas
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Even remote, high-altitude lakes and rivers in the Himalayas aren't safe from plastic pollution—researchers found tiny plastic fibers (mostly from things like clothing and packaging) in both the water and the fish living there, with fish from one lake showing especially high levels. Since these fish are commonly eaten, this suggests microplastics can make their way from far-flung freshwater sources into our food, and the worn, cracked surfaces of these plastic bits may make it easier for them to absorb other harmful substances before reaching our plates.
Microplastic (MP) contamination has emerged as a pervasive environmental issue globally, yet information from high-altitude Himalayan freshwater ecosystems remains scarce. This study combines spatial distribution analysis with morphological characterization (SEM-EDS) to assess polymer weathering of microplastics in surface waters and the freshwater fish Tor putitora (Golden Mahseer) from three Himalayan systems of Uttarakhand, India-Bhimtal Lake, the Ladhiya River (Chalthi), and Pancheshwar (Saryu-Kali confluence). Surface water (100 L/site) and fish (n = 30/site) samples were processed following standardized digestion and filtration protocols. Representative MP particles from water and fish tissues were characterized using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy-energy-dispersive spectroscopy (SEM-EDS). Microplastics were detected in all samples, ranging from 2.4 ± 0.8 particles L⁻ in water to 3.2 ± 1.1 particles g⁻ in fish tissues. Fish from Bhimtal Lake exhibited the highest loads (6.8 ± 0.4 items/individual). Fibers dominated (74-82%), primarily black and blue, with most particles < 500 µm. FTIR analysis identified five major polymer types-nylon, polyethylene, polypropylene, polyethylene terephthalate, and polystyrene while SEM-EDS revealed surface cracking, pitting, and elevated O and Si, indicating oxidative degradation and inorganic adsorption. The integrated spatial-morphological approach demonstrates polymer weathering signatures and trophic transfer pathways in Himalayan rivers, identifying T. putitora as a sentinel species for inland plastic pollution. These findings provide a mechanistic understanding of microplastic transformation and highlight the urgent need for watershed-scale interventions to mitigate plastic contamination in high-altitude freshwater ecosystems. Spatial variation across sites was linked with polymer-specific surface degradation patterns to infer environmental transformation processes.
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Even remote, high-altitude rivers and lakes in northern Pakistan contain tiny plastic particles, found in water, sediment, and fish. Farmed fish had the most microplastics, followed by market fish, while wild fish had the least, suggesting farming practices add extra plastic exposure. Since these fish are eaten locally, this raises questions about how much plastic ends up on people's plates.
Occurrence, Characterization, and Potential Ecological Risks of Microplastics in the Himalayan Riverine Systems
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Scientists found tiny plastic particles (microplastics) in Himalayan rivers that feed into the Ganges and Yamuna, with pollution levels rising as the water flows through more populated downstream areas — meaning even remote mountain water sources aren't safe from plastic contamination. Worse, these plastic bits act like tiny magnets for heavy metals, detergent chemicals, and microbes, potentially carrying harmful substances into the water systems that communities rely on for drinking and irrigation.
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Scientists found tiny plastic particles called microplastics in both the water and bottom sediments of Dal Lake, a high-altitude lake in the Himalayas. This discovery is concerning because it shows plastic pollution has reached even remote mountain areas, and these microscopic plastic pieces can enter our food chain through fish and drinking water. The findings suggest that microplastic contamination is more widespread than previously thought, potentially affecting water sources that communities depend on for drinking and fishing.
Microplastic pollution in the Himalayas: Occurrence, distribution, accumulation and environmental impacts
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This review documents microplastic contamination throughout the Himalayan region, from mountain glaciers and rivers to remote high-altitude locations. Microplastics reach these areas through wind, precipitation, tourism waste, and river transport, and can become trapped in glacial ice before being released during snowmelt. The findings show that even one of the most remote places on Earth is not free from microplastic pollution, with implications for the billions of people who depend on Himalayan rivers for drinking water.
First incidence of microplastic in commercially important food fishes and waters: A case study in the dal Lake ecosystem of North-Western Himalaya (India)
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Researchers found microplastics for the first time in commercially important fish and water from Dal Lake in India's Himalayas, with water containing about 197 particles per liter and fish harboring up to 22 particles each. Polyethylene was the most common plastic type found, and the presence of microplastics in food fish indicates these particles are moving up the food chain toward human consumers.
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