Fairbanks Fish & Wildlife Field Office
Fisheries Monitoring Projects
Alaska Region YouTube
2015 USFWS Alaska fisheries technicians jobs
Data Series Reports for each project
Chandalar River Sonar Project
The Chandalar River is a large tributary of the upper Yukon River in interior Alaska and supports one of the largest runs of fall chum salmon in the Yukon River drainage. Between 1995 and 2006, we used sonar technology to estimate the abundance of fall chum salmon returning to spawn. In 2007, we began using a newer technology—Dual Frequency Identification Sonar (DIDSON)—to help gather the most accurate daily in-season counts and total fish passage estimates. This data helps managers make informed decisions and helps them better evaluate past decisions and actions. Information collected as part of this project is becoming increasingly important as stressors such as climate change, disease, selective harvest, and overall demand on the fisheries and resources in the Yukon River drainage continue to increase.
Andreafsky River Weir Project
The Andreafsky River, a tributary of the Yukon River, supports one of the largest Chinook salmon and the second largest summer chum salmon returns in the Yukon River drainage. A resistance board weir installed on the East Fork of the Andreafsky River is used to collect abundance, run timing, and biological data from Chinook, summer chum, coho, and pink salmon. The Andreafsky River weir is one of the longest-running spawning escapement projects in the Yukon River drainage and is the only spawning escapement project in the lower river. This project allows managers to evaluate escapement goals; analyze trends in salmon abundance, size (length), age, and the male/female ratio; formulate run projections; determine harvest allocations; monitor long-term changes associated with climate change, harvest fluctuations, diseases, and other stressors; and better understand other fish species found in the area.
The camp associated with the weir is used for community outreach and education efforts. We are continually trying to improve our project on the East Fork, and encourage visitors; if you are in the area stop by and say “Hello”.
Gisasa River Weir Project
The Gisasa River, located within the Koyukuk National Wildlife Refuge in north-central Interior Alaska, is a tributary of the Koyukuk River. A resistance board weir is used to collect information on abundance, run timing, and biology of returning adult Chinook and summer chum salmon in the Gisasa River. This project has produced 17 years of data enabling analyses of trends in population status, size, length, age, and gender composition of the run, developing future run projections, and setting and evaluating harvest and escapement goals and allocations. The information collected at the Gisasa River weir is vital to the difficult task of managing the complex mixed-stock subsistence and commercial salmon fisheries in the Yukon River.
Last updated: December 18, 2014