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September 27, 2025NAMMCO Scientific PublicationsOpen Access

Follow-up study after four years shows reduced deterrence effect of pingers on harbour porpoises in Norwegian gillnet fishery

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Authors

AMAndré MoanABArne Bjørge

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Overview

Field trials reveal lower by-catch rates for harbour porpoises using pingers in Norwegian fisheries, suggesting potential desensitisation and reporting biases.

Key Points

  • The by-catch rate for harbour porpoises was about 50% lower in pingered nets than control nets.
  • Average by-catch rates were calculated at 0.031 porpoises per net km day in pingered nets and 0.061 in control nets.
  • The study utilized a generalised linear mixed model approach to analyze the fishing trips conducted by twelve gillnet fishers.
  • This finding suggests that the effectiveness of pingers as a deterrent may be diminishing due to desensitisation of harbour porpoises.

Cite This Study

Moan et al. (2025) studied this question.

synapsesocial.com/papers/68d7be5eeebfec0fc52374dfhttps://doi.org/10.7557/3.8004
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Pingers as a potential deterrent tool to mitigate Burmeister’s porpoise (Phocoena spinipinnis) bycatch while foraging nocturnally in the Humboldt Current System: a pilot study2025
  2. 2Spatiotemporal patterns in harbour porpoise (Phocoena phocoena) bycatch in the Swedish gillnet fishery2026
  3. 3First detailed insights into harbour porpoise behaviour during a bycatch event2026
  4. 4Factors associated with bycatch of marine mammals in United Kingdom static net fisheries2025
  5. 5Artificial clicks (Porpoise ALert) affect acoustic monitoring of harbour porpoises and their echolocation behaviour2025