USGS scientist, Jill Hardiman, working on a screw trap on the White Salmon River to assess anadromous fish recolonization following removal of a large dam.
Ian Jezorek
(He/him)I am a Fisheries Biologist working extensively with small stream and river environments with an emphasis on salmonids, both resident and anadromous. Research includes population, behavior and responses to restoration actions including dam removals. Research tools include snorkeling, electrofishing, and trapping to count and capture fish.
I have focused much on PIT tagging and radio tagging of juvenile and adult salmonids. I have been involved in design, construction, deployment, and operation of many instream PIT-tag interrogation systems.
I am currently involved with studies focusing on steelhead populations, life histories, habitat, and limiting factors in the Wind River, WA as part of a multi-agency effort to restore steelhead populations in the Wind River. A portion of the Wind River work has focused on interaction between juvenile steelhead an introduced run of hatchery spring Chinook salmon. A current focus of work in the Wind River and the White Salmon River, WA is on assessing salmonid population response to dam removal, which has occurred in both watersheds. Much data on salmonid ecology and life-histories is gathered through tagging fish with Passive Integrated Transponder (PIT) tags. Instream PIT tag detection systems are a tool we have employed in many watersheds and continue to do so in several local watersheds.
Science and Products
Salmonid Population and Life History Research in Tributary Stream and River Habitats and Response to Dam Removal
Juvenile anadromous salmonids all spend some portion of their lives in freshwater. This time may vary from days to years depending upon species and run. Spring Chinook Salmon and Coho salmon generally spend one year in freshwater and Steelhead may spend up to five years in freshwater prior to beginning their journey to sea. Several projects at WFRC – CRRL are investigating populations, life...
Rock Creek Fish Population and Life History Assessment (Washington)
The research conducted by the U.S. Geological Survey, in coordination with the Yakama Nation, is designed to determine stream habitat conditions, fish abundance, and fish life history characteristics such as movement, growth, and distribution.
Steelhead Life History Study in White Creek on the Yakama Nation Reservation
Fishery biologists from the U.S. Geological Survey have teamed with fishery biologists from the Yakama Nation to conduct a life history study of the juvenile steelhead using small electronic tags.
Scientist working on White Salmon River screw trap
USGS scientist, Jill Hardiman, working on a screw trap on the White Salmon River to assess anadromous fish recolonization following removal of a large dam.
Science and Products
Salmonid Population and Life History Research in Tributary Stream and River Habitats and Response to Dam Removal
Juvenile anadromous salmonids all spend some portion of their lives in freshwater. This time may vary from days to years depending upon species and run. Spring Chinook Salmon and Coho salmon generally spend one year in freshwater and Steelhead may spend up to five years in freshwater prior to beginning their journey to sea. Several projects at WFRC – CRRL are investigating populations, life...
Rock Creek Fish Population and Life History Assessment (Washington)
The research conducted by the U.S. Geological Survey, in coordination with the Yakama Nation, is designed to determine stream habitat conditions, fish abundance, and fish life history characteristics such as movement, growth, and distribution.
Steelhead Life History Study in White Creek on the Yakama Nation Reservation
Fishery biologists from the U.S. Geological Survey have teamed with fishery biologists from the Yakama Nation to conduct a life history study of the juvenile steelhead using small electronic tags.
Scientist working on White Salmon River screw trap
USGS scientist, Jill Hardiman, working on a screw trap on the White Salmon River to assess anadromous fish recolonization following removal of a large dam.
USGS scientist, Jill Hardiman, working on a screw trap on the White Salmon River to assess anadromous fish recolonization following removal of a large dam.