summary adf&g is implementing a radio telemetry study on yukon summer chum salmon use drift...
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Sean LarsonAlaska Department of Fish and Game
Division of Commercial Fisheries
Summer Chum Salmon Radio Telemetry Study
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SummaryADF&G is implementing a radio telemetry
study on Yukon summer chum salmon
• Use drift gillnets to catch and tag 1200 chum salmon near Russian Mission with spaghetti and radio tags
• Track tagged salmon upriver with remote tracking stations and aerial surveys
• First major effort to estimate summer chum run timing, distribution, and abundance, with consideration for specific stocks
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• Fishing pressure is increasing
• Need this study to manage specific stock groups
• Need more information– Escapement estimates for spawning tributaries– Distribution among spawning areas– Stock specific run characteristics– Anvik River
Importance
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Anvik River• Before 2003: Summer chum salmon escapement
represented 46% of fish passage estimated at the sonar near Pilot Station
• After 2003: Average proportion has dropped to 23%
• Where are they going?
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Primary Objectives
• Estimate stock specific: – Run timing– Migration rates– Movement patterns– Distribution
• Identify important spawning tributaries
• Stock contribution to the overall run
• Estimate drainagewide escapement
• Identify the relationship between the Anvik River sonar and the sonar near Pilot Station
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Previous RT Studies
• Chinook (2002-2004)
• Fall Chum (1996-2001)
• Summer Chum (2004)• Small feasibility study• 200 tagged• Relatively successful
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Russian MissionRussian Mission has several important geographic and
fishery features that make it ideal for tagging
• Beyond most harvests (minimal tag
loss)
• Narrow channel (easy capture)
• EF Andreafsky River has a weir
• Previous tagging efforts
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Tagging
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Tagging
• Two crews– Up to 7.5 h/d– 7 d/w– 5 weeks
• Max of 3 fish per drift
• Gillnet configurations – 4.5” and 4.25” mesh size– 10 f long shackled together as needed– 7.6 m deep – Thicker and softer #21 seine twine to minimize
injuries
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All fish will be handled as gently as possible to minimize stress (and placed in
flow through water tank)
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Spaghetti tags will be white and located against the dorsal fin
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Radio tags will have an antennae protruding out of the mouth
Should examine for both tags
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Tracking Upriver
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How Many Are There?
• Monitoring/Assessment ProjectsAnvik Sonar - Gisasa River Weir - Henshaw Creek Weir - Chena River Tower - Salcha River Tower– Mark-recapture abundance estimate
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Where do they go?• Towers & Aerial Surveys
• Monitoring/Assessment ProjectsAnvik Sonar - Gisasa River Weir - Henshaw Creek Weir - Chena River Tower - Salcha River Tower
• Fishermen
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Alaska Department of Fish and Game
Recovery Project Summer Chum Salmon Radio Tags Data Form, 2014Project
Name/Location: Gear Type:
Date Total No. Total No. Hours No. Tags Tag Gender
mm/dd/yy Estimated Examined OperatedRecovere
d Number M/F/U Length Comments
Note: Instructions for completing form on back.
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Summary
• Tag 1200 summer chums near RM• Track salmon via towers and aircraft• Stock specific:
– Distribution– Abundance– Run timing
• Drainage wide abundance• Evaluate existing monitoring projects• Please keep an eye out for tagged fish
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Alaska Sustainable Salmon Fund
Alaska's allocation of funds from the federal Pacific Coastal Salmon
Recovery Fund
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Questions?
Photo Credit: Peter Mather