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Seasonal Distribution of Microplastics in Farmed Mytilus galloprovincialis and Human Dietary Exposure
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Farmed mussels from Italy's Gulf of Naples contained tiny plastic particles (mostly smaller than 10 micrometers) that varied a lot by season, with the highest levels showing up in summer when the water was warmer. If you're a mussel lover, this matters because older adults who eat them regularly may be getting exposed to more of these smaller, potentially more concerning microplastics — meaning where and when your seafood comes from could affect how much plastic ends up on your plate.
The seasonal distribution of microplastics, as a representative case, was examined in Mytilus galloprovincialis from a pilot farm in the Gulf of Naples (Italy). The influence of marine parameters on microplastic uptake rate was assessed. A destructive patented method was used, and two microplastic size classes (<10 µm; >10 µm) were defined. Estimated Daily Intakes were calculated for different age groups. Results showed a significant abundance of small microplastics (9683.92 ± 6911 vs. 41.85 ± 13.98). In mussels, the highest levels (19,738.13 ± 3406.04) were detected in summer, and the lowest in autumn (4145.56 ± 2364.93). Summer variations in seawater temperature, oxygen, and pH were significantly different from those in winter and spring. High exposure levels, mainly of microplastics < 10 µm, were observed in the elderly (318.08 ± 227.00), followed by adults (225.29 ± 160.78) and children (212.29 ± 151.50), with the lowest in teenagers (127.51 ± 91.00). Despite the high variability of factors influencing mussel filtration and microplastic uptake, the study provided data on the seasonal microplastic distribution pattern and a size-based screening exposure level. Results highlight the importance of geographic and seasonal conditions, and particle size in assessing microplastic exposure through farmed mussel consumption.
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Scientists analyzed commercially sold mussels from markets in southern Italy and found microplastics in every sample tested. On average, each mussel contained about 1.6 plastic particles, with fibers being the most common type, followed by fragments. Since mussels are eaten whole by consumers, the findings highlight a direct pathway for human exposure to microplastics through seafood.
Microplastic contents from maricultured and natural mussels
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Researchers compared microplastic content in maricultured and wild mussels from Italian waters and found no significant difference between the two sources, with all recovered particles being filaments. The study estimates that consuming raw mussels could result in a median intake of 6 to 7 microplastic items per gram, highlighting a consistent route of human dietary exposure regardless of whether mussels are farmed or wild-caught.
C17 | Preliminary study on the determination of microplastics and the assessment of histopathological effects in mussel tissue intended for consumption.
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Researchers analysed microplastics in Mytilus galloprovincialis farmed offshore in the Gulf of Naples across winter and spring seasons and assessed histopathological effects on mussel tissue. MPs were present in all seasonal samples, and associated tissue changes were observed, raising concerns about the quality of farmed mussels for human consumption.
Preliminary survey on the occurrence of microplastics in bivalve mollusks marketed in Apulian fish markets
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Researchers surveyed mussels and oysters sold at fish markets in the Apulia region of Italy and found microplastics present in all samples tested. Mussels contained nearly three times more plastic debris than oysters, with small fragments under 500 micrometers being the most common. The findings raise food safety concerns because these shellfish are typically consumed whole, meaning all ingested microplastics are passed directly to the consumer.
Microplastics in Mussels (Mytilus galloprovincialis): Understanding Pollution in Italian Seas
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A nationwide study across Italy found microplastics in 7-13% of common mussels sampled from Italian seas, mainly polypropylene and polystyrene fragments and fibers. Since mussels are eaten whole without removing their digestive system, any microplastics inside them are directly consumed by people. The findings underscore the need for standardized detection methods and better waste management to protect both marine ecosystems and the seafood supply.
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