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Unveiling the batoid plight: insights from global stranding data and future directions

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A Correction to this article was published on 02 March 2024

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Abstract

Strandings have been extensively documented for large mammals, however, a comprehensive survey focusing on batoids is currently lacking. To address this knowledge gap, we conducted a review of available stranding data sourced from iNaturalist, news websites, and published papers. A total of 3.148 reports encompassing 189 batoid species were recovered, revealing the vulnerability of both oceanic and coastal species to strandings. Nevertheless, limited data on life stage, sex, animal condition, and fate hinder a comprehensive understanding of this phenomenon. Putative causes were identified only for a small percentage (6%) of the reports, namely pollution, abrupt environmental alterations, predation, pathologies, and fishing activities. The earliest reported stranding dates back to 1989, with an increase in reports observed since 2019. iNaturalist accounted for the majority (75%) of records, emphasizing its significance as a platform for reporting and monitoring batoid strandings. These strandings were reported in 51 countries, with the coastal areas of California, United States, particularly notable. Among the identified species, Rhinoptera bonasus exhibited the highest number of strandings, with 392 recorded individuals. Alarmingly, more than half of the reports involved threatened species, underscoring the need for increased attention to batoid strandings. To address these issues, we propose the establishment of stranding monitoring networks and the development of a freely accessible global database. In addition, the training of volunteer citizen scientists, the development of rescue and rehabilitation protocols, and manuals of good fishing practices aimed at commercial and recreational fisheries are also recommended.

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Acknowledgements

NW would like to acknowledge the financial support provided by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior and the Zoology graduate program for the postdoctoral fellowship. RAHD would like to acknowledge support from the Carlos Chagas Filho Foundation for Research Support of the State of Rio de Janeiro (FAPERJ) through a Jovem Cientista do Nosso Estado 2021–2024 grant (process numbers E-26/201.270/2021 and E-26/201.433/2021), a Jovem Pesquisador Fluminense com Vínculo em ICTS do Estado do Rio de Janeiro grant (process number E-26/2010.300/2022) and the Brazilian National Council of Scientific and Technological Development (CNPq), through a productivity grant (process number 308811/2021-6). The implementation of the Projeto Pesquisa Marinha e Pesqueira is a compensatory measure established by the Conduct Adjustment Agreement under the responsibility of the PRIO company, conducted by the Federal Public Ministry—MPF/RJ.

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Conceptualization—NW, EPG, and RDL; Data curation—EPG, RDL, and APC; Writing—original draft—EPG, NW, RDL, APC, and RAHD; Writing—review & editing—NW, RAHD, and PC.

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Correspondence to Eloisa Pinheiro Giareta.

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Giareta, E.P., Leite, R.D., Hauser-Davis, R.A. et al. Unveiling the batoid plight: insights from global stranding data and future directions. Rev Fish Biol Fisheries (2024). https://doi.org/10.1007/s11160-024-09837-3

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