Sonar estimation of summer chum and pink salmon in the Anvik river, Alaska, 2022

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, 2022. Apportionment to
species was determined from data collected from tower counts. A total of
46,436 (SE 769) summer chum and 0 pink salmon were estimated to have
passed the sonar site. A beach seine sample fishery was conducted to
collect age, sex, and length information; however, high water prevented
fishing for part of the season. In addition, because of low salmon
passage, few fish were caught, and the sample fishery was discontinued
early. Both sonar systems functioned well with minimal interruptions to
operation. Range of ensonification was considered adequate for most fish
that migrated upstream.