Improving effort estimates and informing temporal distribution of recreational salmon fishing in British Columbia, Canada using high-frequency optical imagery data

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dc.contributor.author
Morrow, Benjamin D.
O’Hara, Patrick D.
Ban, Natalie C.
Marques, Tunai P.
Fraser, Molly D.
Serra-Sogas, Norma S.
Bone, Christopher E.
dc.date.accepted
2022-01-21
dc.date.accessioned
2024-07-08T19:03:41Z
dc.date.available
2024-07-08T19:03:41Z
dc.date.issued
2022-05
dc.date.submitted
2021-09-08
dc.description.abstract - en
Recreational fisheries often pose various challenges for monitoring. Conventional techniques, such as aerial-roving creel surveys, can lead to estimation bias as they are limited to sampling fragments of these fisheries, which are often fluid and temporally dynamic. In British Columbia, Canada, the existing aerial-roving framework for monitoring marine recreational salmon fisheries relies on angler testimony to report diel temporal distribution of angling and flights to scale-up effort estimation. This work involved implementing two shore-based autonomous cameras set at high capture-rates. One system allowed for the estimation of harbour-specific effort and retention, while the second system informed the timing of angler use by monitoring a popular nearby fishing location. We employed a two-step image filtering system which included the use of a novel deep learning-based system involving a Gaussian Mixture Model-based motion detector for the automatic detection of vessels, to efficiently analyze over one million images. We calculated effort and retention estimates using catch-per-unit effort data from interviews and detailed the diel activity of observed fishing using empirical cumulative distribution and activity pattern analyses. We found that creel estimates were predicting the timing of fishing relatively well, but alone, they may be failing to account for substantial effort in the afternoons. We also provided new insight into a notable amount of off-season fishing effort, which is currently lacking in creel estimates, by surveying beyond peak-season. Our findings suggest that cameras can provide a viable tool in British Columbia for extending the temporal resolution of existing methods while providing an efficient and cost-effective alternative to flights to expand effort data. Increasing camera monitoring to cover additional marinas and popular fishing locales could improve estimation and protect vital fish species.
dc.identifier.issn
1872-6763
0165-7836
dc.identifier.uri
https://open-science.canada.ca/handle/123456789/2667
dc.language.iso
en
dc.publisher
Elsevier
dc.relation.isreplacedby
https://doi.org/10.1016/j.fishres.2022.106251
dc.rights - en
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
dc.rights - fr
Creative Commons Attribution - Pas d'utilisation commerciale - Pas de modification 4.0 International (CC BY-NC-ND 4.0)
dc.rights.openaccesslevel - en
Green
dc.rights.openaccesslevel - fr
Vert
dc.rights.uri - en
https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.uri - fr
https://creativecommons.org/licenses/by-nc-nd/4.0/deed.fr
dc.subject - en
Nature and environment
Science and technology
dc.subject - fr
Nature et environnement
Sciences et technologie
dc.subject.en - en
Nature and environment
Science and technology
dc.subject.fr - fr
Nature et environnement
Sciences et technologie
dc.title - en
Improving effort estimates and informing temporal distribution of recreational salmon fishing in British Columbia, Canada using high-frequency optical imagery data
dc.type - en
Accepted manuscript
dc.type - fr
Manuscrit accepté
local.acceptedmanuscript.articlenum
106251
local.article.journaltitle
Fisheries Research
local.article.journalvolume
249
local.pagination
49 pages
local.peerreview - en
Yes
local.peerreview - fr
Oui
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