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Ghost fishing capacity of lost experimental gillnets: a preliminary study from Indian waters

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Abstract

Abandoned, lost, or otherwise discarded fishing gear contributes considerably to global marine debris. These lost gears, mostly made of non-biodegradable synthetic materials, persist in the marine environment for longer periods of time and pose a great threat to marine life by entangling and killing target fishes and other non-target species such as turtles, birds, and mammals, a phenomenon known as ghost fishing. Other environmental impacts include physical impacts on aquatic habitats, transfer of microplastics into food web, and interference with fishing. Information regarding the catching efficiency and catch rates of lost nets in Indian waters is lacking. Ghost fishing capacity of simulated lost gillnets is being reported for the first time in India. This study investigates the ghost fishing capacity of lost gillnets through an experimental approach at Aroor, Vembanad lake, Kerala, India. Simulation studies using purposefully abandoned shrimp gillnets (32 mm mesh size) were conducted to understand the fishing capacity of lost gillnets during two seasons (monsoon and post-monsoon) as separate experiments. The gillnets maintained their catching efficiency until the 15th day during the first experiment and up to the 50th day in the second experiment. Catches showed an exponential reduction over time in both experiments. A total of 251 specimens comprising of 27 species were caught from both sets of experimental nets, and the state of catch in the nets showed different decaying stages from the second day itself along with fresh stages. As the days progressed, particulate matter and detritus began to accumulate on the experimental nets, increasing net visibility and reducing their catching efficiency. The results of the study on ghost fishing capability will contribute to the development of strategies for reducing the effects of lost nets on the aquatic ecosystem and for suggesting improved management strategies.

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Acknowledgements

The authors are grateful to the Director, ICAR-Central Institute of Fisheries Technology, Kochi, India, for his support and permission to publish this paper. We acknowledge the cooperation and support from the fishermen at Aroor, Vembanad lake, for conducting the field studies.

Funding

The study was funded by the Indian Council of Agricultural Research-Extramural Research Project Fund, New Delhi, India, through the project, “Investigations on ghost fishing by derelict traps and gill nets in selected areas of Indian waters and mitigation measures” (Grant No. 4–59/2015-ASR-I).

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Saly N. Thomas: conceptualization, writing—review and editing, supervision. Sandhya Kavitha Mandhir: compilation, data analysis, writing. Harsha Krishnankutty: investigation, field data collection. Mary Baby: field data collection, tabulation. Aishwarya Ghosh: field data collection.

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Correspondence to Sandhya Kavitha Mandhir.

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Thomas, S.N., Mandhir, S.K., Krishnankutty, H. et al. Ghost fishing capacity of lost experimental gillnets: a preliminary study from Indian waters. Environ Sci Pollut Res 30, 40062–40072 (2023). https://doi.org/10.1007/s11356-022-25029-7

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