Climate data collected during sonar estimation of summer chum and pink salmon in the Anvik River, Alaska, 2024

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 16 to July 26, 2024. Apportionment to species was determined using data collected from tower counts. A total of 135,164 (SE 5,726) summer chum salmon and 126,732 (SE 3,032) pink salmon were observed to have passed the sonar site. A high-water event necessitated removing the sonars from the water on July 14. The right bank sonar was redeployed on July 19 and the left bank on July 20. The range of ensonification was considered adequate for most fish that migrated upstream. A beach seine fishery was conducted to collect age, sex, and length information. Because of high water, the fishery was discontinued after July 9. Climate date was collected daily at 1800 and water temperature data was collected hourly.

Methods
Climatic and hydrologic data were collected at approximately 1800 each day at the sonar site. River depth was monitored using a staff gauge marked in 1 cm increments. Change in water depth was presented as negative or positive increments from the initial reading of 0 cm. Air temperature and subjective notes about wind speed and direction, cloud cover, and precipitation were also recorded. Water temperature was measured using a HOBO data logger, which electronically recorded the temperature every hour, on the hour, for the duration of the project.

本研究于2024年6月16日至7月26日期间，在安维克河（Anvik River）采用双频识别声呐（Dual-frequency identification sonar，DIDSON），估算夏季成年狗鲑（Oncorhynchus keta，summer chum salmon）与粉鲑（O. gorbuscha，pink salmon）的洄游通过量。物种归属判定基于塔式计数法采集的数据完成。共计135164尾夏季狗鲑（标准误SE=5726）以及126732尾粉鲑（标准误SE=3032）被观测到通过声呐监测点位。2024年7月14日因高水位事件，需将声呐设备撤离水域；右岸声呐于7月19日重新布设，左岸声呐则于7月20日完成部署。声呐的探测覆盖范围足以覆盖绝大多数上游洄游鱼类。本研究开展岸曳网（beach seine）捕捞作业以采集鱼类的年龄、性别及体长数据，受高水位影响，该作业于7月9日后终止。每日18:00采集气候数据，水温数据则按小时频次采集。

研究方法
气候与水文数据每日约18:00在声呐监测点位采集。河道水深采用刻度精度为1厘米的水尺（staff gauge）进行监测，水深变化以相对于初始读数（0厘米）的正负增量形式表示。同时记录气温，以及风速、风向、云量和降水情况的主观观测记录。水温采用HOBO数据记录仪（HOBO data logger）进行监测，该设备可在本项目实施期间每小时整点自动记录水温数据。