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Improving Conservation Status of Arctic Grayling; Assessing and Increasing Landscape Connectivity Benefits of Denil Fishways in the Big Hole River Watershed

The purpose of this study is to evaluate the use and effectiveness of Denil structures installed in existing irrigation diversions throughout the Big Hole watershed.  The study will identify features of present installations that prevent, limit and allow successful passage of Arctic grayling and other fish species.  Field work will begin on this project in Summer 2017.  (Photo: ¬©Matt Blank, 2015)

 
Denil Fishway with Flow Restrictor

Modifying Denil Fishways to Optimize Arctic Grayling Passage

The purpose of this project is to evaluate four different flow management structures to determine which are the most effective at passing Arctic grayling through Denils.  A flow management structure is a weir-like device that is installed on the upstream end of the Denil fishway to control the amount of flow passing through it.  Laboratory testing at the Bozeman Fish Technology Center will begin in Summer 2017. 

 
Denil Fishway at Bozeman Fish Techonolgy Center

Evaluating the Efficacy of Denil Fishways in Irrigation Structures for Passage of Arctic Grayling

The purpose of this project is to evaluate how water depth affects passage success for Arctic grayling through both a 6-foot and a 12-foot Denil.  These two lengths are the standard sizes used for passage at irrigation diversions.  Laboratory testing at the Bozeman Fish Technology Center was completed in Summer 2016.  Results will be presented at the American Fisheries Society Western Division Meeting in May 2017.

 
Actic Grayling swimming in flume

Volitional Swimming Performance of Arctic Grayling in an Open-Channel Flume: A Baseline Study

We are characterizing the swimming performance of Arctic grayling, a species of special concern, for fish passage assessment and design.  This project will also be used as a baseline for additional studies on Arctic grayling.  Laboratory testing at the Bozeman Fish Technology Center was completed in Summer 2015.