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RETRACTED: Microplastic contamination in Penaeid shrimp from the Northern Bay of Bengal
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Researchers examined microplastic contamination in two species of commercially important shrimp from the Northern Bay of Bengal in Bangladesh. They found microplastics in the gastrointestinal tracts of both species, averaging about 3.4 to 3.9 particles per gram, predominantly black filaments and fibers made of polyamide and rayon. Note: this paper has been retracted by the journal.
Microplastic pollution has received increased attention recently due to potential threat to marine biota and human health. This study reports microplastic (MP) content in brown shrimp (Metapenaeus monocerous) and tiger shrimp (Penaeus monodon) inhabiting in the shallow and offshore waters of the Northern Bay of Bengal, Bangladesh. Gastrointestinal tract (GT) of shrimps (n = 150) were examined for MPs following alkali digestion, microscopic observation and chemical analysis by micro-Fourier Transformed Infrared Spectroscope (μFTIR). A total of 33 and 39 MP items were found in P. monodon and M. monocerous, averaging 3.40 ± 1.23 and 3.87 ± 1.05 items/g GT, respectively. Among various shapes, types and colours of MP, filament (57-58%), fiber (32-57%) and black (48-51%) were dominant amongst the various particles identified. Tiger shrimp had high numbers (23 items) of larger size fractions of MPs (1-5 mm) but brown shrimp had high numbers (15 items) of smaller MPs (250-500 μm), and μ-FTIR data confirmed 13 particles of polyamide-6 and 6 particles of rayon polymers. These results provide a baseline of MP contamination in seafood from Bangladesh that should be useful for future monitoring efforts.
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RETRACTED: >Microplastics in different fish and shellfish species in the mangrove estuary of Bangladesh and evaluation of human exposure
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This retracted study investigated microplastic abundance in twenty fish and shellfish species from the Sundarbans mangrove estuary in Bangladesh. Researchers found microplastics in all samples, with bottom-feeding species showing the highest contamination levels, and estimated that the average person in Bangladesh may ingest over 85,000 microplastic particles per year through seafood consumption. The dominant polymer types identified were polypropylene, polyethylene, and polyamide.
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Researchers examined the digestive tracts of four commercially harvested shrimp species from the Arabian Sea coast of India and found microplastics in all four, including fibers, pellets, spheres, and fragments made of polyethylene, polystyrene, and other common plastics — providing baseline contamination data for an important seafood source.
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Researchers examined brown shrimp caught from the North Sea and found microplastics in their digestive tracts, documenting contamination in a commercially important crustacean consumed widely by humans in northern Europe.
RETRACTED: Characterization of microplastic pollution in the Pasur river of the Sundarbans ecosystem (Bangladesh) with emphasis on water, sediments, and fish
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This retracted study characterized microplastic pollution in the Pasur River of Bangladesh's Sundarbans, finding plastic particles in 100% of water, sediment, and fish samples analyzed. Microplastics were found in both the digestive tracts and muscle tissue of nine fish species, with some species accumulating high levels in the edible flesh. Note: this paper has been retracted, so its findings should be treated with caution.
Assessment of microplastic contamination in shrimps from the Bay of Bengal and associated human health risk
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Researchers analyzed microplastic contamination in seven shrimp species from the Bay of Bengal and found plastic particles in every species tested, with most particles smaller than 100 micrometers. The study calculated that women in Bangladesh face a higher health risk than men from eating contaminated shrimp, highlighting how seafood can be a direct pathway for microplastic exposure in human diets.
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