[env-trinity] 2022 Lower Trinity River Outmigrant Monitoring through Julian Week 12

[Max Ramos]

Good Afternoon,
Below you will find a summary of the catch data gathered on the lower Trinity River during Julian Week 12 (3/21 - 3/25). Additionally I have attached a spreadsheet that contains the total catch for the season so far and a chart of Trinity River discharge and water temperature in Hoopa for the month of March (taken from USGS Gauge 11530000, 13.75 RKM downstream of the screw trap).
The lower and middle Willow Creek rotary screw traps were operated for 8 trap days (3/21 - 3/25) during Julian Week 12 and the catch included 343 Chinook salmon age 0+, 28 Chinook salmon 1+, 4 ad-clipped Chinook salmon age 1+, 7 steelhead age 1+, 1 brown trout age 1+, and 6 lamprey eyed juveniles. We finished installing the upper Willow Creek rotary screw trap on Friday (3/25), and all three traps will be operated during Julian Week 13. Flow conditions in the lower Trinity River are very low for this time of year (1900 cfs and dropping on 3/18/22 compared to 3500 cfs last year on the same date) which will make the operation of our uppermost trap difficult in the near future. All of our traps are currently in their low-flow positions.
Reminder that these are preliminary data and are subject to revision. The data provided herein are raw catch and not abundance estimates. We will provide flow-based and mark-recapture abundance estimates in our 2022 annual juvenile salmon outmigrant monitoring report. Feel free to contact me with any questions.
Have a great weekend,

Max

Max Ramos
Fish Ecologist
Yurok Tribal Fisheries Trinity Division
(530) 205-6494
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