New Juvenile Fish Trap in the Lochsa!
We thought folks might be interested in why we have this new piece of equipment floating in the Lochsa at Lowell. The Lochsa River is a potential stronghold for wild steelhead in Idaho, though we have much to learn about this population.
Idaho Department of Fish and Game (IDFG) is working to better understand Lochsa River wild steelhead in order to protect and increase the population of this valuable species. The Lochsa River trap will be operated annually, from February to November (as water levels allow), and will be removed and stored offsite during the winter.
Juvenile rotary screw traps are important tools for fisheries managers to capture juvenile steelhead and other fishes. The traps capture juvenile steelhead leaving their natal streams on their journey to the ocean (outmigration). Fish enter the cone of the trap on the upstream side and are held in the live well on the downstream side of the trap. Traps are checked daily and biological data is collected on individual fish before releasing them to continue their migration to the Pacific Ocean
PIT-Tags are widely used to monitor the survival, abundance, and life history of fish populations. PIT-tags are inserted into many of the juvenile steelhead captured which allows us to track individual fishes movements downstream through the dams and back upstream as adults.
IDFG operates the Lochsa River screw trap to collect information on how many wild steelhead are leaving the Lochsa River, when they are leaving, how old they are, and how well they survive on their way to the ocean. These data are extremely useful in providing agencies the information needed to protect and perpetuate this valuable resource. - Brian Knoth, Clearwater Region Fisheries Biologist