Why Are They Important? Bycatch, the unintentional capture of non-target species in fishing operations, is a major threat to marine mammals in some fisheries within European waters. Species like the harbour porpoise are particularly vulnerable. Research has shown significant reductions in bycatch rates when the appropriate pingers are properly deployed. Pingers can, therefore, be an important tool in helping to protect biodiversity and support sustainable fishing practices. Read this documents. https://www.cleancatchuk.com/mitigation/pinger/ https://www.orcaireland.org/the-use-of-pingers-in-the-conservation-of-harbour-porpoise https://archimer.ifremer.fr/doc/00020/13132/10149.pdf https://onlinelibrary.wiley.com/doi/pdf/10.1002/aqc.4004 https://bim.ie/wp-content/uploads/2021/02/BIM-pinger-spacing-report.pdf https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5115164