The suggested citation for this analytic report is:
Thorley, J.L. and Hogan, P.M. (2016) Lower Columbia River Rainbow Trout Spawning Analysis 2015. A Poisson Consulting Analysis Report. URL: https://www.poissonconsulting.ca/f/1611032936.
Each spring in the Lower Columbia River (LCR) below the Hugh L. Keenleyside Dam (HLK) and in the Lower Kootenay River (LKR) below the Brilliant Dam, thousands of Rainbow Trout spawn. Since 1992, BC Hydro has stabilized the spring discharge releases from HLK to protect Rainbow Trout redds from dewatering.
The primary goal of the current analysis to answer the following management questions:
Does the implementation of Rainbow Trout Spawning Protection Flows over the course of the monitoring period lead to an increase in the relative abundance of Rainbow Trout spawning in the LCR downstream of the HLK dam?
Does the implementation of RTSPF over the course of the monitoring period lead to an increase in the spatial distribution of locations (and associated habitat area) that Rainbow Trout use for spawning in the LCR downstream of HLK?
Does the implementation of RTSPF over the course of the monitoring period protect the majority of Rainbow Trout redds (as estimated from spawning timing) from being dewatered in the LCR downstream of HLK?
The suggested citation for this analytic report is:
Thorley, J.L., Andrusak, G.F. and Hogan, P.M. (2015) Lardeau-Lower Duncan River Age-1 Rainbow Trout Abundance and Stock-Recruitment Analysis 2015. A Poisson Consulting Analysis Report. URL: https://www.poissonconsulting.ca/f/1007329429.
The suggested citation for this analytic report is:
Thorley, J.L. and Hogan, P.M. (2015) Lower Columbia River Fish Population Indexing Analysis 2014. A Poisson Consulting Analysis Report. URL: https://www.poissonconsulting.ca/f/1057520643.
In the mid 1990s BC Hydro began operating Hugh L. Keenleyside (HLK) Dam to reduce dewatering of Mountain Whitefish and Rainbow Trout eggs.
The primary goal of the Lower Columbia River Fish Population Indexing program is to answer two key management questions:
What are the abundance, growth rate, survival rate, body condition, age distribution, and spatial distribution of subadult and adult Whitefish, Rainbow Trout, and Walleye in the Lower Columbia River?
What is the effect of inter-annual variability in the Whitefish and Rainbow Trout flow regimes on the abundance, growth rate, survival rate, body condition, and spatial distribution of subadult and adult Whitefish, Rainbow Trout, and Walleye in the Lower Columbia River?
The inter-annual variability in the Whitefish and Rainbow Trout flow regimes was quantified in terms of the percent egg dewatering as greater flow variability is associated with more egg stranding.