Information from Archival Tags on Salmon in the Bering Sea, 20032006

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Information from Archival Tags on Salmon in the
Bering Sea, 2003-2006
NPRB Project R0204 NPAFC Salmon Tagging PI Jack
Helle Vladimir Fedorenko
Robert Walker, Kate Myers, Nancy Davis
School of Aquatic and Fishery Sciences
University of Washington, USA Jack Helle, Jim
Murphy NOAA Fisheries Auke Bay Lab Shigehiko
Urawa National Salmon Resources Center,
Japan NPAFC Olga Temnykh, Vladimir
Sviridov TINRO-Centre, Russia Vladimir
Fedorenko North Pacific Anadromous Fish
Commission
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Acknowledgments

• North Pacific Research Board (NPRB)
• North Pacific Anadromous Fish Commission (NPAFC)
• NOAA/National Marine Fisheries Service, AFSC/ABL
• Fisheries Research Agency National Salmon
  Resources Center HNFRI (Japan)
• Pacific Scientific Research Fisheries Centre
  (TINRO), KamchatNIRO (Russia)
• Department of Fisheries and Oceans (Canada)

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BASIS
The Bering-Aleutian Salmon International Survey
(BASIS) is NPAFC's coordinated program of
cooperative research on Pacific salmon in the
Bering Sea that was designed to clarify the
mechanisms of biological response by salmon to
the conditions caused by climate changes.
Seasonal-specific migration patterns of salmon
and their relation to the Bering Sea ecosystem
Key biological, climatic, and oceanographic
factors affecting long-term changes in Bering Sea
food production and salmon growth rates
www.npafc.org
R0303 - NPAFC Cooperative Research Use of
genetic stock identification to determine the
distribution, migration, early marine survival,
and relative stock abundance of sockeye and chum
salmon in the Bering Sea
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Tag Types

• Lotek LTD_1100 (temperature, depth)
• AlphaMach iBLite, iBKrill (temperature)
• StarOddi DST CTD (salinity, temperature,
  depth)
• Lotek LTD_2400 (temperature, depth,
  light/geolocation)

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Live Box for Trawl
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Offshore archival tagging cruise tracks, 2003-2006
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NPAFC/NPRB DST releases and recoveries, 2003-2006
recovery rates
Overall 7.8
Total releases 637 Total recoveries 50
(Overall INPFC/NPAFC disk tag recovery rate,
1955-2000 3.8)
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Releases and Recoveries by Species
recovery rates
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Recoveries of NPAFC / NPRB DSTs released in the
Bering Sea, North Pacific, and Gulf of Alaska
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1
1
6
1
4
1
1
2
1
1
2
1
2
1
1
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Key to data charts
Depth
Temperature
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Temperatures can help indicate changes in water
mass
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Yukon Chinook - 2 Year Data Record
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Night near surface Day few, large vertical
movements
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Night 25 m below surface Day small vertical
movements, comes to the surface
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Night 25 m below surface Day 100 m below
surface
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Comparison of Winters
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Deep Dive Periods after Winter
April-May 2003
February-May 2004
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Proportion of Chinook By-Catch, EBS Trawl
Fishingby season, age, and depth, 1997-1999
40-80 at 50-400 m, slightly deeper Sept-Oct,
more older fish in winter, younger in summer-fall
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Immature
Maturing
age 1.2
age 1.3
age 1.4
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Sockeye

• Shallow dives (20-30 m)
• Weak to moderate diurnal pattern

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Bering Sea Pink Salmon
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• Strong diurnal pattern
• May remain deep during day
• Moderate depth (40-60m)

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Coho

• Diurnal pattern variable
• Sometimes remains below surface
• 30-70 m dives, to 100 m

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Maximum and Average Minimum Depths (m) on Data
Tags
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Summary

• Generally relatively shallow (to 30-60 m) some
  deep dives by chum and chinook
• Species differences
• Depth ranges often relatively constant while
  temperature ranges vary possible selection for
  depth, not temperature?
• Note most data are from maturing fish Possible
  changes in behavior with stage of maturity
  indicated by 1 tag

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Suggestions for the Future

• Tag more immature salmon
• Tag later in fall, for better chances of
  recoveries of immature salmon
• Tag earlier in spring, for better coverage of
  returning stocks
• Use geolocation tags

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Thank you!
Keep looking for high seas salmon tags!