North Cascades National Park Service U.S. Department of the Interior National Park Complex 2017 NPS Accomplishments: 1) Conducted snorkel surveys of Stehekin River side channel index reaches on six occasions from April– September. Survey goals were to document WCT spawning activities and monitor abundance and distribution of salmonids. 2) Kokanee spawning surveys were conducted on CPUD index sites five times from August 29 th to October 24 th . 3) eDNA sample collection was performed at 26 sites in Stehekin basin. Samples will be examined for westslope cutthroat, rainbow, brook and bull trout. 4) Collected 100 trout fry from Stehekin River spawning habitat for genetic analysis. Identification of newly emerged fry is an alternative method used to determine spawning locations of WCT.
North Cascades National Park Service U.S. Department of the Interior National Park Complex 0.9 Timing of new trout redds in side channel index reaches 0.8 0.7 WCT Average number of redds 0.6 RBT Unknown 0.5 0.4 0.3 0.2 0.1 0 16-Apr 23-Apr 30-Apr 7-May 14-May 21-May 28-May 4-Jun 11-Jun 18-Jun 25-Jun 2-Jul 9-Jul Week of survey
North Cascades National Park Service U.S. Department of the Interior National Park Complex 1.4 Spring spawning season trout abundance surveys 1.2 Number of fish/ 100 m of stream channel 1 WCT >6" RBT >6" 0.8 EBT >6" 0.6 0.4 0.2 0 2009 2010 2011 2012 2013 2014 2015 2016 2017 Year of survey
North Cascades National Park Service U.S. Department of the Interior National Park Complex 3 Late summer/ fall trout abundance surveys 2.5 Number of fish/ 100 m of stream channel WCT >6" 2 RBT >6" EBT >6" 1.5 1 0.5 No Summer/Fall surveys conducted 0 2009 2010 2011 2012 2013 2014 2015 2016 2017 Year of survey
North Cascades National Park Service U.S. Department of the Interior National Park Complex 2.5 Seasonality of trout abundance; 2009- 2017 2 Number of fish / 100 m of stream channel WCT >6" RBT >6" 1.5 EBT >6" 1 0.5 0 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 April May June July Aug Sept Oct
North Cascades National Park Service U.S. Department of the Interior National Park Complex 35000 CPUD Blackberry 2017 escapement 30,161 CPUD Company estimate= 72,156 30000 28,469 kokanee 25,747 25000 Number of kokanee counted 20000 15000 10000 3,971 5000 1,049 707 708 221 64 0 Date of survey
North Cascades National Park Service U.S. Department of the Interior National Park Complex 200000 0.5 NPS Mainstem Escapement NPS Side Channel Escapement 180000 0.45 CPUD Side Channel Index Escapement WDFW overall kokanee CPUE 160000 0.4 Kokanee CPUE (kokanee/ hour) Kokanee escapement estimate 140000 0.35 120000 0.3 100000 0.25 80000 0.2 60000 0.15 40000 0.1 20000 0.05 0 0 Year of survey
North Cascades National Park Service U.S. Department of the Interior National Park Complex Stehekin River bull trout eDNA results map.
North Cascades National Park Service U.S. Department of the Interior National Park Complex Results of trout fry genetic analysis; 2011- 2015 30 Hybrid RBT 25 WCT 20 Number of individuals 15 10 5 0 i5 i6 i8 i9 i10 i11 i13 i4 i10 i14 i15 i5 i12 i4 i6 i8 i13 i16 i18 i19 2011 2011 2011 2011 2012 2012 2012 2012 2013 2013 2013 2013 2014 2014 2014 2014 2015 2015 2015 2015 Index site no. and year of survey
North Cascades National Park Service U.S. Department of the Interior National Park Complex Questions?
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