Climate data collected during sonar estimation of summer chum and pink salmon in the Anvik River, Alaska, 2023

Dual-frequency identification sonar (DIDSON) was used to estimate adult
summer chum salmon Oncorhynchus keta and pink salmon O. gorbuscha passage
in the Anvik River from June 15 to July 26, 2023. Apportionment to species
was determined using data collected from tower counts. A total of 60,665
(SE 778) summer chum were observed to have passed the sonar site, but no
pink salmon were observed in 2023.A beach seine sample fishery was
conducted to collect age, sex, and length information. A high-water event
necessitated removing the sonars from the water from July 10 until July 24
and the sample fishery was discontinued after July 7. Due to the timing
and extended duration, it was not possible to estimate the missing portion
of the run. The range of ensonification was considered adequate for most
fish that migrated upstream. Climate data was collected every day at 1800
and water temperature data was collected hourly.