Nearshore Fish in the Chukchi Sea, Alaska Nearshore Fish in the Chukchi Sea, Alaska Objectives In nearshore waters of the Chukchi Sea: • Identify distribution and relative abundance of fish Establish • baseline for long-term Arctic monitoring Collect and archive fish for energetic, genetic, and • voucher specimens Sample design August 2007- 2009 & 6 stations 2 bottom trawl tows & Methods Bottom trawl tows Beach seine hauls Environmental conditions Capelin Sea ice break-up Timing of ice break-up varied among years • June 2007 August 2008 July 2009 Barrow Sea Ice Cam images Arctic cod Dominant fish early early late late moderate moderate 2008 Species composition & catch Seine Trawl 2007 2009 n = 98 n = 1,465 n = 246 Arctic cod Arctic cod other spp. Sculpins Sculpins other spp. n = 5,779 n = 415 n = 2,387 Capelin Capelin other spp. Sand lance Sculpins cold cold warm warm Sea surface temperature (SST) • Mean annual August SST related to ice break-up timing o C -2 0 6 4 2 8 10 12 14 AOOS images AOOS images 2007 2007 study area warm warm x x = = 9 9 ° ° 2009 moderate moderate x = 6 ° ° o = = 2008 2008 cold cold x x = = 2 2 ° ° Pacific sand lance Sculpin spp. Results n = 98 n = 1,465 n = 246 Arctic cod Arctic cod other spp. Sculpins Sculpins other spp. n = 5,779 n = 415 n = 1,412 Capelin Capelin other spp. Sand lance Sculpins Sept. 2009 moderate moderate Capelin Arctic cod n = 6,449 • Capelin most abundant in warm year (2007) and in September • Arctic cod most abundant in cold year (2008) and in September • Catch and species composition differed in 2009 between Aug. and Sept. moderate moderate Saffron cod September 2009 1 seine haul/station Slender eelblenny Beaufort Sea Chukchi Sea Barrow Cooper Island Seine Other spp. 18% Capelin 82% Trawl Catch by gear • Dominant species differed by gear type Capelin other spp. Beach seine 8 m depth trawl trawl 5 m depth Alaska 0 15 km 10 5 represent the views or official position of the Department of Commerece, NOAA, or NMFS. The recommendations and general content presented in this poster do not necessarily Total catch % Total catch Arctic cod Capelin 26 species n = 19,147 fish 10% 21% 69% Annual catch • Abundance varied by Trawl Seine 2008 - cold 2007 - warm 2009 - moderate Chukchi Sea year and gear type John F. Thedinga, Scott W. Johnson, and A. Darcie Neff NOAA Fisheries, Auke Bay Laboratories, Juneau, Alaska Chris A. Hoffman U.S. Army Corps of Engineers, Alaska District • Capelin and Arctic cod are abundant in nearshore waters of the Chukchi Sea • Sea ice conditions affect the distribution and abundance of nearshore fish Fish abundance and species composition varied monthly and annually • Conclusions Conclusions Mostly juveniles Other spp. 44% Arctic cod 56% Gulf of Alaska Bering Sea Arctic Ocean Study area
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Nearshore Fish in the Chukchi Sea, AlaskaNearshore Fish in the Chukchi Sea, Alaska Objectives
In nearshore waters of the Chukchi Sea: • Identify distribution and relative abundance of fi sh Establish• baseline for long-term Arctic monitoring Collect and archive fi sh for energetic, genetic, and • voucher specimens
Sample designAugust 2007- 2009 &
6 stations
2 bottom trawl tows &
Methods
Bottom trawl towsBeach seine hauls
Environmental conditions
Capelin
Sea ice break-up
Timing of ice break-up varied among years•
June 2007 August 2008 July 2009
Barrow Sea Ice Cam images
Arctic cod
Dominant fish
earlyearly latelate moderatemoderate
2008
Species composition & catch
Seine
Trawl
2007 2009
n = 98 n = 1,465 n = 246
Arctic cod
Arctic cod
other spp.
Sculpins Sculpinsother spp.
n = 5,779 n = 415 n = 2,387
CapelinCapelin
other spp.
Sand lanceSculpins
coldcoldwarmwarm
Sea surface temperature (SST)
• Mean annual August SST related to ice break-up timing
oC-2 0 642 8 10 12 14
AOOS imagesAOOS images
20072007studyarea
warmwarmx x == 9 9°°
2009
moderate moderatex = 6°°
o
==
20082008
coldcoldx x == 2 2°°
Pacifi c sand lance
Sculpin spp.
Results
n = 98 n = 1,465 n = 246
Arctic cod
Arctic cod
other spp.
Sculpins Sculpinsother spp.
n = 5,779 n = 415
n = 1,412
CapelinCapelin
other spp.
Sand lanceSculpins
Sept. 2009moderatemoderate
Capelin
Arctic cod
n = 6,449
• Capelin most abundant in warm year (2007) and in September• Arctic cod most abundant in cold year (2008) and in September• Catch and species composition differed in 2009 between Aug. and Sept.
moderatemoderate
Saffron cod
September 2009
1 seine haul/station
Slender eelblenny
Beaufort Sea
Chukchi SeaBarrow
Cooper Island
Arctic cod
Seine
Other spp. 18%
Capelin 82%
Trawl
Catch by gear
• Dominant speciesdiffered by gear type
Capelin
other spp.
Beachseine
8 m depthtrawl
trawl5 m depth
Alaska
0 15 km105
represent the views or offi cial position of the Department of Commerece, NOAA, or NMFS. The recommendations and general content presented in this poster do not necessarily
Total catch
% T
otal
cat
ch
Arctic cod
Capelin
26 species
n = 19,147 fi sh
10%
21%
69%
Annual catch
• Abundance varied by
TrawlSeine
2008 - cold2007 - warm
2009 - moderate
Chukchi Sea
year and gear type
John F. Thedinga, Scott W. Johnson, and A. Darcie NeffNOAA Fisheries, Auke Bay Laboratories, Juneau, Alaska
Chris A. Hoffman U.S. Army Corps of Engineers, Alaska District
• Capelin and Arctic cod are abundant in nearshore waters of the Chukchi Sea • Sea ice conditions affect the distribution and abundance of nearshore fi sh Fish abundance and species composition varied monthly and annually•
ConclusionsConclusions Mostly juveniles
Other spp. 44%
Arctic cod 56%
Gulf of Alaska
Bering Sea
Arctic Ocean
Studyarea
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