Date requested: 3/20/2018 3:49:39 PM

Requester: Jon Hansen

Requester email: jon.hansen@idfg.idaho.gov

Request status: Approved

Action and Files
Target group Site Action Tags for Action Total Tags Released Start Date End date Additional Info
PIT-tagged Pahsimeroi Fish Hatchery adipose fin-clipped hatchery adult Chinook Salmon. GRA Collect all 20 44,693 4/16/2018 8/3/2018 Tag Pahsimeroi Hatchery fish with 7 MCFT2-3A and 13 MCFT-7F radio telemetry tags. Use esophageal implantation method. There may only be 10-20 PIT-tagged hatchery adult fish returning to Pahsimeroi Hatchery so we will want to radio tag all hatchery adult fish with PIT tags.
Title: Copy of Travel timing and habitat use of Pahsimeroi Fish Hatchery summer Chinook Salmon - Implications as they pertain to upper Salmon River salmon fisheries.
Project Lead: Jon Hansen
Agency: IDFG
Project Number: 18-NWFSC-99
Funding Agency: LSRCP
Project Objectives: 1) Tag 20 Pahsimeroi Fish Hatchery hatchery adult Chinook Salmon with Lotex radio telemetry tags. 2) Do daily monitoring of hatchery Chinook Salmon "gross movement" travel times from USFS Corn Creek boat launch to Pahsimeroi Fish Hatchery. 3) Monitor "micro movements" of select individual fish fish to observe habitat preferences regarding holding areas, water temperatures, and flow levels. Observe diurnal and nocturnal movement behavior.
Study Description: Chinook Salmon fisheries in the upper Salmon River are highly dependent on knowledge of the biology and behavior of hatchery fish. Fish returns to Pahsimeroi Fish Hatchery primarily consist of summer run Chinook Salmon. Based on limited Chinook Salmon fisheries and PIT tag array data, the return timing and use of the Salmon River by adult fish apparently varies by stock. The goal of this project is to gather information to better manage fisheries in the Upper Salmon River to provide sport anglers access to their harvest share without impacting broodstock collection. Angler catch rates for Chinook Salmon downriver from the town of Salmon are usually depressed or non-existent. Variables such as river flow and river width likely contribute to poor catch rates. Based on limited PIT tag data for both spring and summer Chinook Salmon stocks, there is a significant reduction in travel times once fish near juvenile rearing facilities. However, Pahsimeroi Fish Hatchery summer Chinook Salmon may stage in the upper Salmon River for very limited amounts of time before they enter the hatchery trap. The difference regarding staging times between spring and summer stocks of fish may result in dissimilar catch rates, which can limit the harvest share utilization of certain stocks. Knowledge of the migration timing and staging of these stocks is crucial in the management of these fisheries. Hatchery fish tagged with radio-telemetry tags with temperature sensing abilities may provide data on water temperature and fish movement relationships in the upper Salmon River. For example, fish may not hold in the main Salmon River below Pahsimeroi River because water in the Pahsimeroi River may be cooler (compared to the Salmon River). In 2016, 20 adult Chinook Salmon from Sawtooth Fish Hatchery were radio-tagged and tracked through the upper Salmon River fishery. However, none of the 3 radio-tagged fish from Pahsimeroi Fish Hatchery were detected in the fishery. During 2018, our goal is to radio tag fish from Pahsimeroi Fish Hatchery to allow comparisons to Sawtooth Fish Hatchery Chinook Salmon travel time and staging time data collected during 2016.
Juvenile Description:
Smolt-to-Adult Ratio:
Collection Efficiency:
Adult Description: Pahsimeroi Fish Hatchery adult Chinook Salmon primarily consist of summer stock. Chinook Salmon from Pahsimeroi Fish Hatchery are currently considered listed under ESA. Pahsimeroi Fish Hatchery origin PIT-tagged hatchery adult Chinook Salmon will be diverted at Lower Granite Dam using Separation by Code technology and target fish will be implanted with radio transmitters. Radio transmitter implantation will be conducted by NOAA personnel (contact is Darren Ogden) at the Lower Granite adult trap with materials supplied by IDFG. The expected number of target fish is 20. Movement will be monitored by vehicle and foot when target fish reach the Salmon River / Corn Creek area (approximately 42 miles downriver from North Fork, Idaho).
Certify: True