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045 |ax6y1
0861 |aFs70-5/2025-069E-PDF
1001 |aTucker, Strahan, |eauthor.
24510|aStock assessment of Pacific harbour seals (Phoca vitulina richardii) in Canada in 2019 / |cStrahan Tucker, Sheena Majewski, Chad Nordstrom, M. Kurtis Trzcinski, Thomas Doniol-Valcroze.
264 1|aOttawa ON : |bCanadian Science Advisory Secretariat (CSAS), |cNovember 2025.
264 4|c©2025
300 |a1 online resource (v, 82 pages) : |billustrations (chiefly colour), colour maps.
336 |atext|btxt|2rdacontent
337 |acomputer|bc|2rdamedia
338 |aonline resource|bcr|2rdacarrier
4901 |aResearch document, |x1919-5044 ; |v2025/069
500 |aIssued also in French under title: Évaluation des stocks de phoque commun du Pacifique (Phoca vitulina richardsi) au Canada en 2019.
504 |aIncludes bibliographical references.
5203 |a"Standardized aerial surveys were conducted between 2015-2019 to assess the abundance of Harbour Seals in British Columbia (BC). Approximately 90% of the entire coastline was covered using fixed-wing aircraft to count seals hauled-out on land during specific low-tide windows. Five years were required to survey all regions of BC, and thus, this assessment represents a compilation of surveys. Thirty-two satellite transmitters were deployed on adult and juvenile seals between 2019-2021 to estimate the proportion hauled-out, and to calculate a correction factor for animals at-sea and not present at the time of the surveys. An estimate of 78.5% of the seals were hauled-out during the survey period. This marks a substantial change from the last derivation from the early 1990's, when 62% of the seals were hauled-out. After applying the most recent correction factor, adjusting estimates for survey coverage, and summing regional abundance estimates in the year surveyed, 84,500 (95% CI 81,160 to 87,970) harbour seals were estimated in BC in 2015-2019. Projecting all regional trends to 2019 yielded a total estimate of 86,000 (95% CI 74,750 to 98,990) harbour seals in BC waters. Potential Biological Removal (PBR) estimated at 4,895 seals in 2019. While regional PBR allocations were estimated, they were deemed problematic as they may lead to local depletions. Correcting past surveys for uncovered areas resulted in an updated estimate for 2003-2008 of 112,400 (95% CI 108,000-117,000) seals, which is similar to the initial estimate of 105,000 seals (95% CI of 90,900-118,900). Given the uncertainty in the regional estimates, the stock in 2015-2019 is considered either stable or in slight decline relative to the 2003-2008 assessment. Abundance, density and trends varied regionally"--Abstract, page v.
650 0|aHarbor seal|zBritish Columbia|zPacific Coast.
650 0|aSeal populations|xEstimates|zBritish Columbia|zPacific Coast.
7102 |aCanadian Science Advisory Secretariat, |eissuing body.
7101 |aCanada. |bDepartment of Fisheries and Oceans. |bNational Capital Region, |eissuing body.
77508|tÉvaluation des stocks de phoque commun du Pacifique (Phoca vitulina richardsi) au Canada en 2019 / |w(CaOODSP)9.955961
830#0|aResearch document (Canadian Science Advisory Secretariat)|v2025/069.|w(CaOODSP)9.507396
85640|qPDF|s4.03 MB|uhttps://publications.gc.ca/collections/collection_2025/mpo-dfo/fs70-5/Fs70-5-2025-069-eng.pdf