Location

Oregon State University

Start Date

27-6-2013 4:10 PM

End Date

27-6-2013 4:30 PM

Description

Yellowstone Cutthroat trout (YCT) have disappeared from more than 70% of their historic range during the past200 years. With over 350 miles of occupied habitat, the Shields River Subbasin is a rare stronghold among watersheds supporting YCT in Montana, as this species is spread throughout the basin, rather than being relegated to headwater stream reaches. Unfortunately, nonnative brook trout which outcompete YCT for food and space, have been exponentially increasing in distribution and abundance in the upper basin over the past decade and if left unchecked, could entirely displace YCT in the headwaters. This has left managers with the task of assessing the tradeoffs between improving fish passage to preserve the unique interconnected YCT population (metapopulation) versus constructing barriers to secure the YCT population in the upper basin from invasion and displacement by brook trout. To inform agency management decisions, the Wildlife Conservation Society began a multi-year fish movement study using passive integrated transponder (PIT) tags in 2011. Data suggest that brook trout abundance and distribution is increasing faster than anticipated and that management action, including the use of fish barriers, is needed to secure the upper Shields River basin from brook trout invasion and the associated consequences. Agencies are currently formulating a strategy which maintains as much connected habitat as possible while also reducing or excluding brook trout from critical habitats.

Comments

Clint Sestrich is a Fisheries Biologist with the Gallatin National Forest in Livingston, Montana. He received his Masters Degree in2006 from Montana State University where he studied recovery of native and nonnative fish populations from a large wildfire. Restoration of native cutthroat trout is a high priority of the Gallatin National Forest and much of Clint's work Involves working closely with partners to secure and restore Yellowstone cutthroat trout populations.

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Jun 27th, 4:10 PM Jun 27th, 4:30 PM

Concurrent Sessions C: A Cooperative Approach to Solving Fish Habitat Recovery - Determining the Need for Fish Passage Versus Fish Barriers

Oregon State University

Yellowstone Cutthroat trout (YCT) have disappeared from more than 70% of their historic range during the past200 years. With over 350 miles of occupied habitat, the Shields River Subbasin is a rare stronghold among watersheds supporting YCT in Montana, as this species is spread throughout the basin, rather than being relegated to headwater stream reaches. Unfortunately, nonnative brook trout which outcompete YCT for food and space, have been exponentially increasing in distribution and abundance in the upper basin over the past decade and if left unchecked, could entirely displace YCT in the headwaters. This has left managers with the task of assessing the tradeoffs between improving fish passage to preserve the unique interconnected YCT population (metapopulation) versus constructing barriers to secure the YCT population in the upper basin from invasion and displacement by brook trout. To inform agency management decisions, the Wildlife Conservation Society began a multi-year fish movement study using passive integrated transponder (PIT) tags in 2011. Data suggest that brook trout abundance and distribution is increasing faster than anticipated and that management action, including the use of fish barriers, is needed to secure the upper Shields River basin from brook trout invasion and the associated consequences. Agencies are currently formulating a strategy which maintains as much connected habitat as possible while also reducing or excluding brook trout from critical habitats.