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SC/69A/HIM/10/Rev1
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Resource ID
20018
Access
Open
Document Number
SC/69A/HIM/10/Rev1
Full Title
Using the Bycatch Risk Assessment Tool for Small Cetaceans in a Data-Poor Fishery off Isla Grande de Chiloe, Southern Chile
Author
F. Barilari, K. Deforest, E. Hines, M. Sepulveda, M. José Perez, L. Bedriñana, S. Gelcich, J. Matera, J. Guerra
Authors Summary
Using the Bycatch Risk Assessment (ByRA) tool, it was possible to map areas of bycatch risk for three species of small cetaceans on the island of Chiloé. Being a very coastal fishery, generally no more than 200 m from the coast, a high risk of bycatch was observed on the coast, where the fishery overlaps with the distribution of Chilean dolphins, Burmeister's porpoises and Peale's dolphins, whose distributions are strongly associated with coastal environments (Molina-Schiller et al. 2005, Ribeiro et al. 2007, Viddi et al. 2016, Heinrich et al. 2019). The ByRA model is an important tool to address risk assessment in fisheries and species with little information available, as it allows different approaches, such as the knowledge of experts and other relevant actors, to be used to obtain risk maps and contribute to fisheries management and species conservation (Costanza et al. 2021). ByRA provides opportunities to truly engage fishers in the bycatch mitigation process, encourages their conversation and representation through the exchange of information, and for fishers to influence outcomes (Costanza et al. 2021).
Publisher
IWC
Publication Year
2023
Abstract
Bycatch has been recognized as the main threat to small cetacean populations (Mitchell 1975, Perrin et al. 1994). Of the different types of fishing gear used in the world, gillnet bycatch represents an important conservation problem for small cetaceans and other non-target species (e.g. Rojas-Bracho et al. 2006, Jaramillo-Legorreta et al. 2017), causing considerable mortality of individuals each year (Perrin et al. 1994). Synthetic gillnets were widely introduced into the world's fisheries as a durable and economical fishing gear after World War II (Potter & Pawson 1991), and quickly became the main driver of population declines in many species of dolphins, porpoises and other marine mammals.