Fluvial (entirely stream-dwelling) Arctic grayling (Thymallus arcticus montanus) were indigenous to the park in the headwaters of the Madison and Gallatin rivers and to the Gibbon and Firehole rivers below their first falls. Fluvial grayling were eliminated from their entire native range within the park by the introduction of competing nonnative fishes such as brown trout and brook trout, and the fragmentation of migration pathways by the construction of the Hebgen Dam outside the park. Grayling within the upper Gallatin River drainage disappeared around 1900, while grayling in the upper Madison River drainage disappeared by 1935. The only known populations left in the park are adfluvial (primarily lake-dwelling) descendants of fish that were stocked in Cascade and Grebe lakes.
One of the goals of the park’s 2010 Native Fish Conservation Plan is to restore fluvial grayling to approximately 20% of their historical distribution. The upper reaches of Grayling Creek are considered the best site for immediate fluvial grayling restoration. Near the park boundary, a small waterfall exists in the creek (which flowed directly into the Madison River prior to the construction of Hebgen Dam in 1914). It is not known if grayling were ever present upstream of the waterfall, but they were abundant downstream.
The Grayling Creek restoration project aims to establish Arctic grayling and westslope cutthroat trout to 95 kilometers (59 miles) of connected stream habitat in one of the most remote drainages in the species historic range within Yellowstone.
In summer of 2013 a barrier was completed at the waterfall to prevent upstream movement of nonnative fish. During August 2013, a crew of 27 biologists from Yellowstone National Park, Montana Fish, Wildlife and Parks, Gallatin National Forest, Turner Enterprises, and US Fish and Wildlife Service treated the stream segment with piscicide to remove all fish. A second treatment took place in 2014. Restocking of the Grayling Creek watershed with native fluvial Arctic grayling and westslope cutthroat trout began in 2015 and continued in 2016. The effort included moving approximately 950 juvenile and adult westslope cutthrout trout to lower reaches of Grayling Creek, above the project barrier. In addition, 37,600 westslope cutthrout trout eggs and 150,000 fluvial grayling eggs were placed in remote-site incubators throughout the upper watershed.
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To maintain the natural biodiversity of the Yellowstone ecosystem, sometimes you have to start small. Fish biologist Todd Koel discusses efforts to restore native fish in Grayling Creek, a cup of eggs at a time.
Yellowstone Cutthroat Trout
Yellowstone cutthroat trout are the most widespread native fish in the park.
Westslope Cutthroat Trout
Historically the most abundant and widely distributed subspecies of cutthroat trout throughout the West.
Lives in rivers and streams with deep pools, clear and clean water.
Mottled sculpin live in shallow, cold water throughout Yellowstone except the Yellowstone River above Lower Falls and in Yellowstone Lake.
Yellowstone’s minnows are small fish living in a variety of habitats and eating a variety of foods.
Suckers are bottom-dwelling fish that use ridges on their jaws to scrape flora and fauna from rocks.
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Last updated: April 19, 2017