2017 Dworshak Dam Effects on Clearwater In-river Fish

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Presentation transcript:

2017 Dworshak Dam Effects on Clearwater In-river Fish

Elevated Total Dissolved Gas (TDG) Fish Exposure and Risk Assessment

TDG Related Mortality TDG Level Depth Duration Specie Life Stage

TDG Related Mortality Don E. Weitkamp & Max Katz (1980): A Review of Dissolved Gas Supersaturation Literature, Transactions of the American Fisheries Society, 109:6, 659-702 Don. E. Weitkamp. 2008. Total Dissolved Gas Supersaturation Biological Effects, Review Of Literature 1980-2007, June 2008 Draft Eggs: 0% regardless of TDG level Fry: 68-75% with TDG 120-124% Juveniles: 0-100% with TDG 110-120%

Redd Abundance and Distribution 2016 Fall Chinook Salmon Redd Abundance and Distribution Redds below NPTH (n=724)

51. 3% of the Snake River redds occurred in the lower Clearwater (92 51.3% of the Snake River redds occurred in the lower Clearwater (92.2%) or North Fork Clearwater rivers (7.8%)

Ahsahka Islands

Ahsahka Island Redds (n=241)

Ahsahka Island Redds

Estimated Emergence Timing and TDG Induced Mortality March 4 to April 14 TDG < 120% 4.5% of Clearwater juveniles potentially exposed TDG Related Mortality 0 to 4.5%, likely <2%

Beach Seining CPUE Demonstrates successful juvenile fall chinook incubation, eye-up and rearing. Does not quantify potential direct or indirect mortality from TDG exposure.

Beach Seining Fish Condition TDG 103-112% GBT symposiums in most fish, but limited to gills and lateral line. Feeding appeared normal. Growth appeared normal.

Elevated Total Dissolved Gas (TDG) Fish Exposure and Risk Assessment (Preseason)

Elevated Total Dissolved Gas (TDG) Fish Exposure and Risk Assessment (Updated)

Priorities for 2018 Operations Nez Perce Tribe Priorities for 2018 Operations Achieve full pool for summer flow augmentation. Maintain in-river TDG levels at 100% to the greatest extent possible. Maintain in-hatchery TDG levels at or below 101% (in-river TDG 115% or less). Provide spring flow augmentation flows, consistent with natural hydrograph, to the greatest extent possible.

Photos by Mary Edwards (www.maryedwardsphotography.com) Acknowledgments: Bill Arnsberg, Scott Kellar, Thomas Tall Bull, Billy Connor, USGS, COE Photos by Mary Edwards (www.maryedwardsphotography.com)