Elizabeth Logerwell and Kimberly Rand Alaska Fisheries Science Center
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1 Beaufort Sea: Perspectives on Climate Change and Fisheries Elizabeth Logerwell and Kimberly Rand Alaska Fisheries Science Center John Horne and Sandra Parker-Stetter University of Washington Tom Weingartner University of Alaska Minerals Management Service
2 Arctic warming
3 Beaufort Sea historical surveys Frost and Lowry; opportunistic sampling on CGC Glacier 1990 Thorsteinson et al; nearshore sampling; further offshore than previous surveys No quantitative survey before 2008
4 Objectives Baseline for oil/gas development and climate change Methods for future monitoring surveys Species, distribution, abundance, and biological characteristics of fish and invertebrates Oceanography and zooplankton Seabirds and marine mammals
5 Details 6-22 August 2008 Charter vessel F/V Ocean Explorer Bottom trawl (1.5 mesh liner) Net height, spread, bottom contact Acoustic-trawl Calibrated ES-60 at 38kHz Marinovich mid-water net CTDs Bongo nets for zooplankton (333 and 150 micron) Strip transects for seabirds Opportunistic observations of marine mammals
6
7 Sampling Species composition by weight and number Sexed-length-weights Otoliths (Arctic cod and pollock) Stomachs Stable isotopes Ovaries (Arctic cod only) Genetics Fish ID vouchers Photo by: Jen Nomura
8 Bottom trawls Photo by: Heloise Chenelot Photo by: Darin Vanderpol
9 Species Fish (bottom trawl) 36 species identified, 6% of total catch weight Mean CPUE (kg/ha) Boreogadus saida (Arctic cod) Lycodes sp. (eelpouts; includes 7 species) 3.83 Hippoglossoides robustus (Bering flounder) 0.74 Theragra chalcogramma (walleye pollock) 0.70 Reinhardtius hippoglossoides (Greenland turbot) 0.23 Liparis gibbus (variegated snailfish) 0.17 Liparis fabricii (gelatinous seasnail) 0.09 Myoxocephalus verrucosus (warty sculpin) 0.03 Triglops pingeli (ribbed sculpin) 0.03 Gadus macrocephalus (Pacific cod) 0.02
10 Additional range extensions Liparis marmoratus (festive snailfish) Nautichthys pribilovius (eyeshade sculpin) Triglops nybelini (bigeye sculpin) * * Not known from Alaska
11 Arctic cod walleye pollock
12 n = 1,493 Arctic cod 100 frequency ` fork length (mm) n = 99 Walleye pollock frequency fork length (mm)
13 Walleye pollock (length/age) Beaufort sea pollock were ~ 1 year older at length than Bering sea pollock Beaufort sea pollock 2007 Bering sea pollock length (mm) age (years)
14 Arctic cod CPUE
15 Arctic cod weight
16 Water column profiles
17 Acoustics (with midwater trawls) Midwater trawl Photo by: Erika Acuna
18 Arctic cod length frequency Frequency Length (mm)
19 Age-0 Arctic cod (+sculpin, stickleback) Age-0 & Age-1+ echograms Age-1+ Arctic cod 3 km 35 m
20 Age-1+ Arctic cod density distribution Average = 10,000 fish/ha ~Average = 80 kg/ha
21 Age-0 Arctic cod density distribution Average = 5,000 fish/ha ~Average = 2 kg/ha
22 Invertebrates (bottom trawl) 174 species identified, 94% of total catch weight Species Mean CPUE (kg/ha) Ophiura sarsi (brittle star) Empty shells (bivalve/gastropod) Musculus niger (mollusk) Urticina lofotensis (sea anemone) Chionocetes opilio (snow crab) Ctenodiscus crispatus (starfish) Vulcanella (sponge) Strongylocentrotus sp. (sea urchin) Psolus phantapus (sea cucumber) Phascolosomatidae (worms) 14.34
23 Opilio crab (Chionocetes opilio) Photo by: Heloise Chenelot Photo by: Erika Acuna 10% total weight of invertebrate catch
24 Opilio crab Opilio crab weight vs. carapace width weight (kg) Legal size Previous arctic surveys (Beaufort 1977, Chukchi 1990) opilio crab <100 mm Commercial size width (mm)
25 Opilo crab CPUE
26 Opilio crab weight Water temp 0.7 C
27 Bottom temperature
28 Geographic and historic comparisons
29 Species Geographic comparisons Beaufort Sea Chukchi Sea Bering Sea CPUE (kg/ha) CPUE (kg/ha) CPUE (kg/ha) Arctic cod Arrowtooth flounder * * Bering Flounder Cottidae (sculpin family) Flathead sole * * Greenland turbot * < Northern rock sole * * 41 Pacific cod * Saffron cod * 0.39 <0.01 Walleye pollock Yellowfin sole * * 42.4 Zoarcidae (eelpout family) Snow Crab this study 2 Barber et al., Eastern Bering Sea 2008 survey (Jason Conner, AFSC, pers. com)
30 Species Geographic comparisons Beaufort Sea Chukchi Sea Bering Sea CPUE (kg/ha) CPUE (kg/ha) CPUE (kg/ha) Arctic cod Arrowtooth flounder * * Bering Flounder Cottidae (sculpin family) Flathead sole * * Greenland turbot * < Northern rock sole * * 41 Pacific cod * Saffron cod * 0.39 <0.01 Walleye pollock Yellowfin sole * * 42.4 Zoarcidae (eelpout family) Snow Crab this study 2 Barber et al., Eastern Bering Sea 2008 survey (Jason Conner, AFSC, pers. com)
31 Species Geographic comparisons Beaufort Sea Chukchi Sea Bering Sea CPUE (kg/ha) CPUE (kg/ha) CPUE (kg/ha) Arctic cod Arrowtooth flounder * * Bering Flounder Cottidae (sculpin family) Flathead sole * * Greenland turbot * < Northern rock sole * * 41 Pacific cod * Saffron cod * 0.39 <0.01 Walleye pollock Yellowfin sole * * 42.4 Zoarcidae (eelpout family) Snow Crab this study 2 Barber et al., Eastern Bering Sea 2008 survey (Jason Conner, AFSC, pers. com)
32 Species Geographic comparisons Beaufort Sea Chukchi Sea Bering Sea CPUE (kg/ha) CPUE (kg/ha) CPUE (kg/ha) Arctic cod Arrowtooth flounder * * Bering Flounder Cottidae (sculpin family) Flathead sole * * Greenland turbot * < Northern rock sole * * 41 Pacific cod * Saffron cod * 0.39 <0.01 Walleye pollock Yellowfin sole * * 42.4 Zoarcidae (eelpout family) Snow Crab this study 2 Barber et al., Eastern Bering Sea 2008 survey (Jason Conner, AFSC, pers. com)
33 Historical comparison Species Beaufort Sea 2008 CPUE (kg/ha) Arctic cod marbled eelpout Canadian eelpout fish doctor < Bering flounder 0.74 * walleye pollock 0.70 * Greenland turbot 0.23 * variegated snailfish 0.17 * gelatinous seasnail 0.09 * unidentified snailfish warty sculpin 0.03 * ribbed sculpin spatulate sculpin < twohorn sculpin * 74 Pacific cod 0.02 * Snow (opilio) crab Beaufort Sea 1977 No. individuals
34 Historical comparison Species Beaufort Sea 2008 CPUE (kg/ha) Arctic cod marbled eelpout Canadian eelpout fish doctor < Bering flounder 0.74 * walleye pollock 0.70 * Greenland turbot 0.23 * variegated snailfish 0.17 * gelatinous seasnail 0.09 * unidentified snailfish warty sculpin 0.03 * ribbed sculpin spatulate sculpin < twohorn sculpin * 74 Pacific cod 0.02 * Snow (opilio) crab Beaufort Sea No. individuals
35 Historical comparison Species Beaufort Sea 2008 CPUE (kg/ha) Arctic cod marbled eelpout Canadian eelpout fish doctor < Bering flounder 0.74 * walleye pollock 0.70 * Greenland turbot 0.23 * variegated snailfish 0.17 * gelatinous seasnail 0.09 * unidentified snailfish warty sculpin 0.03 * ribbed sculpin spatulate sculpin < twohorn sculpin * 74 Pacific cod 0.02 * Snow (opilio) crab Beaufort Sea 1977 No. individuals
36 Historical comparison Species Beaufort Sea 2008 CPUE (kg/ha) Arctic cod marbled eelpout Canadian eelpout fish doctor < Bering flounder 0.74 * walleye pollock 0.70 * Greenland turbot 0.23 * variegated snailfish 0.17 * gelatinous seasnail 0.09 * unidentified snailfish warty sculpin 0.03 * ribbed sculpin spatulate sculpin < twohorn sculpin * 74 Pacific cod 0.02 * Snow (opilio) crab Beaufort Sea No. individuals
37 Summary First offshore marine fish survey of the Beaufort Sea since 1977 Arctic cod dominant in benthic and pelagic communities Range extensions of 5 species (incl. Pacific cod and pollock) Commercial-size snow (opilio) crab observed for the first time in the Arctic Pollock well below commercial size
38 Thanks To the science and vessel team and RACE Groundfish Assessment
39 For more information
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