I often find myself telling people how exciting it is to have a job where my days hold such variety and often entirely unexpected excitement. Perhaps I’ll find a new population of an endangered plant, shock a giant bull frog while electro fishing, or watch F-15 fighter jets dog fight over the vast expanse of sage brush and scab land. This week the variation in my days came with a day spent at Oregon Institute of Technology’s mammography lab.

At this point it is believed that the Lost River Sucker, an endangered species of fish native to the Klamath area, is not found in the Sprague River. Two other species of sucker, the Short Nose Sucker and Klamath Large Scale Sucker, are found in both the Sprague River  and in Upper Klamath Lake however despite the fact that the Sprague and Upper Klamath Lake are connected and open to fish passage the Lost River Sucker is only known to exist in the lake.

About 10 years ago close to 800 juvenile suckers were collected from the Sprague for a research project of some sort and eventually ended up preserved in alcohol in the flammables closet at the US Fish and Wildlife office in Klamath Falls, OR. Jump ahead 10 years and these samples presented the perfect opportunity to look further into the question of whether Lost River Suckers are reproducing in the Sprague River.

The crux of answering this question, and the reason I recently spent my day in a mammography lab, is that distinguishing between juvenile Lost River Suckers and other species of suckers is extremely difficult. With such small fish the only real way to identify species is by the number of vertebrae. Lost River Suckers have 45 or more vertebrae and the other species have 45 or fewer. So with the help of the interns from last year having sorted the fish by size and attached museum tags with distinct numbers to each fish, the other intern in the office and I set off to get the fish x-rayed.

With the help of a number of students and a professor at Oregon Institute of Technology we carefully laid out our samples, placed metal numbers and letters on each sheet, snapped a picture to be able to later align the x-rays with museum tags, pushed Bertha the prosthetic breast out of the way, and scanned 41 slides holding a total of 794 fish.

While we have the pictures and x-rays we have yet to spend the hours it will take to count the 45+ or 45- vertebrae on each fish (don’t worry, we do have a computer program that will make this process slightly easier) so unfortunately this blog post has a slightly anti-climactic conclusion. But stay tuned! The question of whether there are Lost River Suckers in the Sprague River will have an updated, data-supported answer shortly.