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Ecotoxicological and physiological risks of microplastics on fish and their possible mitigation measures
Summary
This review summarizes how microplastics affect fish health, including reduced feeding, impaired gill function, weakened immune systems, and reproductive problems. Researchers found that microplastics can transfer through the food chain from smaller organisms to top predators, raising concerns about broader ecosystem impacts. The study also highlights mitigation strategies such as reducing single-use plastics, recycling, and using bioplastics.
Microplastics (MPs) are widely distributed and extensively found within marine ecosystems, and approximately 8 million tons of plastics are being dumped into the sea annually. Once reached the marine environment, plastics tend to get fragmented into smaller particles through photo-degradation, mechanical and biological processes. These MPs have raised concerns globally due to their potential toxic impacts on a wide variety of aquatic fauna and humans. Ingested microplastics can cause severe health implications in fishes, including reduced feeding intensity, improper gill functioning, immuno-suppression, and compromised reproducibility. Several studies were also conducted to scrutinize MPs trophic transfer through the food chain from primary producers to top predators and their bioaccumulation. This paper briefly summarizes all the possible sources, routes, bioavailability, trophic transfer, and consequences of microplastics in fishes. The review article also intended to highlight various mitigation strategies like implementing Four R's concept (refuse, reduce, reuse, and recycle), integrated strategies, ban on single-use plastics, use bioplastics, and create behavioural changes with public awareness.
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