Journal article
Risk versus reward: interactions, depredation rates, and bycatch mitigation of dolphins in demersal fish trawls
Canadian Journal of Fisheries and Aquatic Sciences, Vol.75(12), pp.2233-2240
2018
Abstract
An improved understanding of interaction dynamics between dolphins and trawlers is essential for improving bycatch mitigation strategies. In-situ observations using video at increasing distances from the net opening during 50 commercial fish trawls, recorded 5908 common bottlenose dolphin (Tursiops truncatus (Montagu, 1821)) interactions and provided details on their duration, depredation rates, and behaviours. Dolphin interactions with trawls were very common (98% of day-trawls, 118 ± 16 interactions per trawl), with durations and prey consumption positively correlated with the distances ventured into the net. Acoustic deterrents (pingers) had no effect on interaction numbers or durations. Based on in-situ observations, the factors that contribute toward dolphin bycatch in demersal fish trawls were likely associated with (i) risky dolphin behaviour (i.e., entering net during hauling, residing deep within trawl for extended periods or social aggression) and (or) (ii) instability of fishing gear resulting in entrapment. Given the high level of dolphin attendance during most day-trawls, mitigation strategies that focus on improving and monitoring the stability of trawl gear would be more effective than current acoustic deterrent devices aimed at modifying dolphin behaviour.
Details
- Title
- Risk versus reward: interactions, depredation rates, and bycatch mitigation of dolphins in demersal fish trawls
- Authors/Creators
- J. Santana-Garcon (Author/Creator) - Curtin UniversityC.B. Wakefield (Author/Creator) - Government of Western AustraliaS.R. Dorman (Author/Creator) - Government of Western AustraliaA. Denham (Author/Creator) - Government of Western AustraliaS. Blight (Author/Creator) - Government of Western AustraliaB.W. Molony (Author/Creator) - Government of Western AustraliaS.J. Newman (Author/Creator) - Government of Western Australia
- Publication Details
- Canadian Journal of Fisheries and Aquatic Sciences, Vol.75(12), pp.2233-2240
- Publisher
- National Research Council of Canada
- Identifiers
- 991005541030407891
- Copyright
- Copyright remains with the author(s) or their institution(s)
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
UN Sustainable Development Goals (SDGs)
This output has contributed to the advancement of the following goals:
Source: InCites
Metrics
42 Record Views
InCites Highlights
These are selected metrics from InCites Benchmarking & Analytics tool, related to this output
- Collaboration types
- Domestic collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.35 Zoology & Animal Ecology
- 3.35.796 Marine Mammal Ecology
- Web Of Science research areas
- Fisheries
- Marine & Freshwater Biology
- ESI research areas
- Plant & Animal Science