Deming Creek Electrofishing

The week before last, we all got our first practical introduction to electrofishing, a technique that allows you to capture fish by sending an electric pulse through the water, momentarily stunning them at the right settings. Our primary goal was to quantify how efficient and skilled we were at electrofishing. Alongside that we took down species, length, and weight and marked the fish by clipping a small portion of the upper or lower caudal fin based on the size of the fish. We set of block nets on either end of a 200 meter section of stream a total of four separate times to close the population and keep fish inside each section. In our first pass we marked each fish we caught and in a second pass we checked to see what percentage of captured fish were recaptures from the first pass. With this data we can make some more sophisticated estimates of our capture efficiency and the stream population and make up. Deming Creek is a beautiful and varied tributary of the North Fork Sprague River partially inside the Gearhart Mountain Wilderness near Bly, Oregon. We even had a chance to camp out by the creek to reduce our footprint, enjoy a camp meal, and get a view of the stars!

Marked native great basin redband trout (Oncorhynchus mykiss newberrii) from Deming Creek
Marked native bull trout (Salvelinus confluentus) being weighed
A block net spanning Deming Creek to block off a 200 meter section to fish movement

                Last week was all about writing, researching, and data visualization. I was particularly invested in learning how to use R Studio to visualize data we took down about brook trout fecundity. I wasn’t expecting to love R Studio as much as I did – I’m definitely eager to work with it more. We learned all about the Endangered Species Act (thank you Elizabeth!) and the fascinating ways it dictates conservation policy and also scouted an unnamed tributary of the Sprague River as possible bull trout habitat, an endangered trout that also inhabits nearby Deming Creek.

Had a blast over the last few weeks, can’t wait to see whats in store!


Klamath Falls FWS Field Office

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