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SALMON COLLECTION & TAGGING PROJECT
On December 7, 2014, a rock fall estimated at 50,000 cubic meters, impacted the Seymour River, at a location at the upstream end of the lower canyon. The debris field from this slide raised the water level in the river some 10 meters creating
Seymour Rockslide – Photo credit: Simon Ager
a blockage to downstream-migrating juveniles and upstream-migrating adult salmon. The upper Seymour River, above the rock fall, contains the large majority of the productive salmon habitat in the watershed, and therefore there are justified concerns about the health of the Seymour River salmon run in coming years, if migration past the rock fall is not restored. In fact, coho and steelhead could be reduced to remnant populations by as early as 2019 if we are unable to mitigate the effects of the slide.
To scientifically confirm whether or not fish are able to pass through the debris, juvenile steelhead were acoustically tagged and adult coho and steelhead were radio tagged. Pacific Salmon Foundation, Fisheries and Oceans Canada, BC Ministry of Forests, Lands and Natural Resource Operations, UBC, Kintama & Freshwater Fisheries Society of BC contributed emergency funding and equipment for the tagging programs. Receivers were placed at both the downstream and upstream end of the slide and mobile trackers were deployed. To date no fish have been detected by fixed or mobile receivers.
Snorkel surveys conducted in July of 2015 confirmed that a number of fish were holding in two pools directly below the slide debris.
PVC Trap – Photo Credit Brian Har
Fisheries and Oceans Canada is working in partnership with the Seymour Salmonid Society, Metro Vancouver, Squamish Nation, Tsleil Waututh Nation and North Vancouver District, to attempt an emergency rescue effort to capture returning salmon in the lower Seymour River. Salmon recovered from these efforts will be placed in transport tanks and transported to the Seymour River Hatchery until target broodstock numbers are achieved. Surplus fish will be released directly into the upper Seymour River, above the slide and below the dam.
Initially, a PVC and net trap was set up in the lower river adjacent to the Squamish Nation Band Office. High-water events due to summer storms thwarted these methods and hoop nets and seine
Hoop Net – Photo credit: Brian Har
nets were quickly put to use. These methods proved highly successful for pinks, but staff was forced to adapt once again for coho and steelhead. Tangle nets and angling is currently being used to capture fish out of the lower river with good success.
All 2015 in-river work is done with hand labour and does not require heavy machinery access this season. Vehicle access in close proximity to the river bank near the capture sites may be necessary, given that all trap materials and captured salmon must be moved by hand from and to transport vehicles. Captured salmon will be moved by field crews to the transport tanks daily depending on capture success in the river trap.
Tangle Net – Photo credit: Sombilon Photography for PSF