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040 |aCaOODSP|beng|erda|cCaOODSP
0410 |aeng|beng|bfre
043 |an-cn-bc|apn-----
045 |ax7y2
0861 |aFs97-6/3667E-PDF
1001 |aDunic, Jillian C., |eauthor.
24510|aAssessing the quality of groundfish population indices derived from the small-mesh multi-species bottom trawl survey / |cby Jillian C. Dunic and Sean C. Anderson.
264 1|aNanaimo, British Columbia : |bPacific Biological Station, Fisheries and Oceans Canada, |c2025.
264 4|c©2025
300 |a1 online resource (v, 40 pages) : |billustrations (some colour), colour maps.
336 |atext|btxt|2rdacontent
337 |acomputer|bc|2rdamedia
338 |aonline resource|bcr|2rdacarrier
4901 |aCanadian technical report of fisheries and aquatic sciences, |x1488-5379 ; |v3667
504 |aIncludes bibliographical references (pages 31-32).
5203 |a"Since 1973, Fisheries and Oceans Canada has conducted the Small-mesh Multi-species Bottom Trawl Survey (SMMS), the longest continuous fisheries-independent monitoring time series for groundfish off the west coast of Vancouver Island (WCVI). Initially designed to assess Pink shrimp (Pandalus jordani) populations, the survey also samples groundfish. The SMMS provides a valuable historical baseline for groundfish species, as current groundfish trawl surveys began in 2003 and are biennial across regions. However, changes to the SMMS, including changes to the sampling area, fishing gear, and catch recording procedures, may affect the quality of groundfish population indices. Here, we summarise these changes and examine their impact on relative biomass indices for groundfish. We compare spatiotemporal model-based population indices from the SMMS with other regional indices and examine the distribution of lengths and ages in comparison to the synoptic West Coast Vancouver Island trawl survey (SYN WCVI). Our analysis suggests that the modelled SMMS index is likely an appropriate index of relative biomass for many groundfish species. However, changes to the survey, such as the switch to comprehensive species sorting and identification, introduce uncertainties in the pre-2003 data. Additionally, the SMMS detected signs of rockfish recruitment earlier than the SYN WCVI for some species"--Abstract, page iv.
546 |aIncludes abstracts in English and French.
650 0|aGroundfishes|zBritish Columbia|zPacific Coast|xStatistical methods.
650 0|aFish populations|xEstimates|zBritish Columbia|zPacific Coast|xStatistical methods.
650 0|aZoological surveys|zBritish Columbia|zPacific Coast.
650 6|aPoissons de fond|zColombie-Britannique|zPacifique, Côte du|xMéthodes statistiques.
650 6|aPoissons|xPopulations|xEstimation|zColombie-Britannique|zPacifique, Côte du|xMéthodes statistiques.
650 6|aInventaires fauniques|zColombie-Britannique|zPacifique, Côte du.
7101 |aCanada. |bDepartment of Fisheries and Oceans, |eissuing body.
7102 |aPacific Biological Station (1972- ), |eissuing body.
830#0|aCanadian technical report of fisheries and aquatic sciences ;|v3667.|w(CaOODSP)9.504449
85640|qPDF|s17.00 MB|uhttps://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-6/Fs97-6-3667-eng.pdf