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Environmental and ecological risk of microplastics in the surface waters and gastrointestinal tract of skipjack tuna (Katsuwonus pelamis) around the Lakshadweep Islands, India

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Abstract

The presence of microplastics (MPs) in marine ecosystems is widespread and extensive. They have even reached the deepest parts of the ocean and polar regions. The number of articles on plastic pollution has increased in recent years, but few have investigated the MPs from oceanic islands which are biodiversity hotspots. We investigated the possible microplastic contamination their source and characteristics in surface waters off Kavaratti Island and in the gastrointestinal tract (GT) of skipjack tuna, Katsuwonus pelamis collected from Kavaratti Island of the Lakshadweep archipelago. A total of 424 MP particles were isolated from the surface water samples collected from off Kavaratti Island with an average abundance of 5 ± 1nos./L. A total of 117 MPs were recovered from the GT of skipjack tuna from 30 individual fishes. This points to a potential threat of MP contamination in seafood around the world since this species has a high value in local and international markets. Fiber and blue color were the most common microplastic morphotypes and colors encountered, respectively, both from surface water and GT of fish. Smaller MPs (0.01–1 mm) made up a greater portion of the recovered materials, and most of them were secondary MPs. Polyethylene and polypropylene were the most abundant polymers found in this study. The Pollution Load Index (1.3 ± 0.21) of the surface water and skipjack tuna (1 ± 0.7) indicates a minor ecological risk for the coral islands, while the Polymer Hazard Index highlights the ecological risk of polymers, even at low MP concentrations. This pioneer study sheds preliminary light on the abundance, properties, and environmental risks of MPs to this highly biodiverse ecosystem.

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Data is submitted to the data center of the CSIR-National Institute of Oceanography, and the data can be made available as per the terms and conditions of the institute.

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Acknowledgements

The authors express their gratitude to the Director, CSIR-National Institute of Oceanography, Goa, and Scientist-In-Charge, CSIR-National Institute of Oceanography, Regional Centre, Kochi, for providing support and facilities during the study. The authors would like to thank Dr. Toms C. Joseph for providing access to the instrumentation facility for ATR-FTIR analysis.

Funding

This study is part of MLP 2013 project funded by the CSIR, India.

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Saraswathi Ragesh: formal analysis, methodology, software, data curation, visualization, investigation, and writing—original draft. Koovapurath Useph Abdul Jaleel: conceptualization, resources, writing—reviewing and editing, and supervision. Ramachandran Nikki: methodology, software, data curation, visualization, and writing—editing. Mannayath Abdulazeez Abdul Razaque: visualization and writing—editing. Pachareentavita Muhamed Ashraf: analysis, validation, and reviewing and editing. Chinmayanandhan Nair Ravikumar: visualization and writing—editing. Anas Abdulaziz: project administration, resources, and reviewing and editing. Periyadan Katinhippally Dinesh Kumar: project administration, reviewing and editing, and supervision.

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Correspondence to Koovapurath Useph Abdul Jaleel.

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Responsible Editor: V.V.S.S. Sarma

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Ragesh, S., Abdul Jaleel, K.U., Nikki, R. et al. Environmental and ecological risk of microplastics in the surface waters and gastrointestinal tract of skipjack tuna (Katsuwonus pelamis) around the Lakshadweep Islands, India. Environ Sci Pollut Res 31, 22715–22735 (2024). https://doi.org/10.1007/s11356-024-32564-y

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  • DOI: https://doi.org/10.1007/s11356-024-32564-y

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