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Microplastic Occurrences in Freshwater Fish of Bangladesh
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This review synthesizes research on microplastic contamination found in freshwater fish across Bangladesh, where rapid population growth and urbanization have led to significant plastic pollution. Researchers found that fibers are the most commonly detected microplastic type in fish tissues, raising concerns about impacts on gut health and immune function. The study highlights the need for more comprehensive monitoring given Bangladesh's heavy reliance on freshwater fish as a dietary staple.
Over the years, there has been widespread detection of microplastics (MPs) in unacceptable concentrations, which has increased the susceptibility of our environment to emergent pollutants. Bangladesh has produced tremendous plastic over the past four decades due to its accelerated population growth, urbanization, and cost-effectiveness. This plastic undergoes a process of degradation, which gives rise to the problem of MPs. Although over the last 7 years, a significant number of MP studies have been conducted in Bangladesh, MP contamination in freshwater fish-related studies was first conducted in 2021. Comprehensive studies of MP contamination in freshwater fish have yet to be explored entirely in Bangladesh. However, MP contamination in freshwater fish has a devastating impact on the gut health, immunity, and increase in the risk of developing diseases. Hence, this book chapter seeks to provide an up-to-date account of MP contamination in Bangladesh’s freshwater fish by synthesizing prior research. Furthermore, this chapter will explore MPs origins, distribution patterns, destiny, and transit in freshwater fish populations. This study is significant because it contributes to the increasing knowledge regarding MP pollution in freshwater ecosystems, which is particularly crucial in regions such as Bangladesh, which rely significantly on freshwater resources.
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Microplastics in Some Freshwater Wild and Farmed Fish Species of Bangladesh
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Researchers found microplastics in multiple freshwater fish species from both wild river populations and farmed fish in Bangladesh, with fibers being the dominant type. The study highlights the widespread contamination of both wild and farmed fish in major Bangladeshi rivers, with implications for human dietary exposure through fish consumption.
Bioaccumulation of microplastics in the edible tissues of fish collected from urban lakes of Bangladesh: a potential exposure to public health
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Researchers analyzed fish from urban lakes in Bangladesh and found microplastics present in the edible tissues of all species examined, with fibers being the most common type. The level of contamination varied by fish species and lake location, reflecting differences in local pollution levels. The findings raise public health concerns about microplastic exposure through freshwater fish consumption in densely populated urban areas.
Pervasiveness of microplastics in the gastrointestinal tract of some selected fish species from Turag River alongside the capital city of Bangladesh
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Researchers found microplastics in all three species of fish collected from the Turag River near Dhaka, Bangladesh, with fiber being the dominant type at 89-93% of all particles found. The most common plastics identified were polypropylene, polystyrene, and low-density polyethylene, with the majority of particles smaller than 0.5 mm. Since these freshwater fish are a major protein source for local communities, the contamination raises concerns about microplastic exposure through the food supply in urban areas of developing countries.
Microplastics in fishes from the Northern Bay of Bengal
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Researchers examined microplastic contamination in three fish species collected from the Northern Bay of Bengal in Bangladesh. They found an average of 3 to 9 microplastic items per fish, with fibers and irregular fragments being the most common types. The study highlights the prevalence of microplastic pollution in this important fishery region and the potential for human dietary exposure through consumption of these commonly eaten fish species.
Abundance, characteristics and variation of microplastics in different freshwater fish species from Bangladesh
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Researchers examined 48 freshwater fish from 18 species in Bangladesh and found microplastics in the digestive tracts of over 73% of the fish studied. Fibers were the most common shape, and the plastics were primarily polyethylene and polypropylene-based polymers. Bottom-dwelling fish contained more microplastics than those living higher in the water column, suggesting that contaminated sediments are a significant source of exposure for freshwater species.
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