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020 |a9780660748450
040 |aCaOODSP|beng|erda|cCaOODSP
0410 |aeng|beng|bfre
043 |an-cn-bc
045 |ay1y2
0861 |aFs97-13/1420E-PDF
1001 |aPon, L. B. |q(Lucas Benjamin)|eauthor.
24510|aPopulation surveys of juvenile sockeye salmon (Oncorhynchus nerka) in Bowron Lake, British Columbia between 2017 and 2021 / |cby Lucas B. Pon and Garrett W. Lidin.
264 1|aCultus Lake, BC : |bCultus Lake Salmon Research Laboratory, Science Branch, Pacific Region, Fisheries and Oceans Canada, |c2025.
264 4|c©2025
300 |a1 online resource (viii, 32 pages) : |bcolour illustrations, map.
336 |atext|btxt|2rdacontent
337 |acomputer|bc|2rdamedia
338 |aonline resource|bcr|2rdacarrier
4901 |aCanadian data report of fisheries and aquatic sciences, |x1488-5395 ; |v1420
504 |aIncludes bibliographical references (pages 10-11).
5203 |a"Bowron Lake serves as nursery rearing habitat for the COSEWIC listed Bowron Sockeye Salmon (Oncorhynchus nerka) population (DU 2; endangered). While adult returns to the Bowron system have been assessed on a regular basis, past juvenile abundance assessments have been limited. A renewed effort to monitor Bowron juveniles occurred with paired acoustic-trawl surveys in the fall of 2017, 2018, 2019, and 2021. This report details Sockeye Salmon and Kokanee (O. nerka) fry abundances and densities, as well as fish size data, and fry diet analyses. Kokanee were the primary competitor to Sockeye Salmon in all years, and were the dominant planktivorous species in years following low adult Sockeye returns. Sockeye Salmon fry were consistently larger than Kokanee in all years where comparisons could be made. Diet of juvenile O. nerka consisted primarily of Daphnia spp. and fry were generally found to be fairly well fed in all years. In some years of low returns, Sockeye fry abundance relative to the number of spawners appeared abnormally high, highlighting the potential challenges of enumeration under such conditions. Continued acoustic-trawl surveys of Bowron Lake are recommended as efforts to enhance the juvenile population with hatchery reared fry have been recently engaged by DFO's Salmonid Enhancement Program"--Abstract, page vii.
546 |aIncludes abstracts in English and French.
650 0|aSockeye salmon|xInfancy|zBritish Columbia|zBowron Lake.
650 0|aKokanee salmon|xInfancy|zBritish Columbia|zBowron Lake.
650 0|aFish surveys|zBritish Columbia|zBowron Lake.
650 6|aSaumoneau rouge|zColombie-Britannique|zBowron, Lac.
650 6|aJeune kokani|zColombie-Britannique|zBowron, Lac.
650 6|aInventaires ichtyologiques|zColombie-Britannique|zBowron, Lac.
7101 |aCanada. |bDepartment of Fisheries and Oceans, |eissuing body.
7102 |aCultus Lake Research Laboratory, |eissuing body.
830#0|aCanadian data report of fisheries and aquatic sciences ;|v1420.|w(CaOODSP)9.505124
85640|qPDF|s3.66 MB|uhttps://publications.gc.ca/collections/collection_2025/mpo-dfo/Fs97-13-1420-eng.pdf