Note technologies with partial efficacy, positive mitigation potential with no significant outcome, or where no significance is reported. Recognition:
Reviews in Fish Biology and Fisheries
(2022). DOI: 10.1007/s11160-022-09736-5
A new study has revealed the potential of sensory deterrents to reduce bycatch of marine megafauna in fisheries.
Research from Newcastle University suggests that sensory deterrents work in certain circumstances and can be part of the solution to reducing bycatch.
Sensory deterrents are designed to provide sensory cues to marine megafauna (marine mammals, seabirds, sea turtles, sharks and rays) to avoid their contact with fishing gear while maintaining target catch levels and quality. There are several types of sensory technology to reduce bycatch, including acoustic devices, the use of alternative bait types (e.g. using fish bait instead of squid), the use of water hoses or cannons for deterrence, the use of lights and magnets, and modification to standard equipment color, such as lines and nets.Several technologies have been shown to be effective in reducing bycatch in some studies but ineffective in reducing bycatch in others. LED lights have been the only technology that has proven successful in trials across all marine megafauna groups. However, they had also led to increased bycatch in some seabird and elasmobranch species (shark and ray).
Publication of their results in the journal
Reviews in Fish Biology and Fisheries
the authors argue that sensory deterrents can help reduce bycatch under certain circumstances. However, differing results caused by environmental factors and differences in species biology make generalizations difficult. Other issues include the cost of the equipment and the potential for unintended broader environmental damage.
Sol Lucas, a PhD student at Newcastle University’s School of Natural and Environmental Sciences, said: “The variability in study results underscores the importance of scientists and policymakers considering all available evidence when designing plans to reduce bycatch for fisheries. This study summarizes evidence for the use of sensory deterrents in fisheries that contribute to these decision-making processes.”
The authors reviewed available research (116 studies) testing the sensory deterrents to reduce bycatch (accidental or unintentional capture) of several marine megafauna species in fisheries. All available literature on sensory discoveries in peer-reviewed journals was reviewed and the study found that the effectiveness of available technologies varied.
Professor Per Berggren, Chair of Marine Megafauna Conservation at the Faculty of Natural and Environmental Sciences, added: “Most of the technologies we reviewed are immature and little is known about the potential ecological impacts. Further research is needed to understand the long-term effectiveness and effects of sensory deterrents. Reducing bycatch of marine megafauna is critical because of their importance to the health of ecosystems and to the communities that depend on fisheries for income and food security. The authors of the study conclude that addressing bycatch in most fisheries is likely to require a number of measures (including temporary area closures, gear changes and catch limits). They suggest creating bycatch mitigation programs on a case-by-case basis, tailored to the needs of individual fisheries, species and local communities. More information:
Sol Lucas et al, A systematic review of sensory deterrents for bycatch reduction in marine megafauna,
Reviews in Fish Biology and Fisheries(2022). DOI: 10.1007/s11160-022-09736-5
Provided by Newcastle University
Citation: Reducing bycatch with sensory deterrents (2022 November 17) Retrieved November 17, 2022 from https://phys.org/news/2022-11-bycatch-sensory-deterrents.html This document is copyrighted. Except for fair trade for the purpose of private study or research, no part may be reproduced without written permission. The content is for informational purposes only.
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