A New Time Series: Eastern Bering Sea Upper Continental Slope … · 2011. 11. 2. ·...

INTRODUCTIONThe eastern Bering Sea (EBS) slope environment produces some of the largest fish biomass world-wide. Groundfish assessments depend on bottom trawl surveys for fisheries independent biomass estimates and stock structure of many commercial and ecologically important fish and invertebrate species. The Alaska Fisheries Science Center has begun a new time series of bottom trawl surveys from the upper continental slope of the eastern Bering Sea. To date the time series consists of five successful biennial surveys conducted between 2000 and 2010, with the next survey scheduled to be conducted in 2012. The new time series utilizes modern net mensuration, navigational and oceanographic equipment, as well as current taxonomic keys and guides, providing the most accurate and detailed information available.

NET DESIGN & OPERATIONThe eastern Bering Sea upper continental slope survey is conducted with a Poly Nor’Eastern trawl net rigged with groundgear consisting of 8 inch rubber disks over a ½ inch chain. The doors have a four-point bridle connection which increases door stability at the relatively slow (2.5 knot) towing speed. During towing the net dimensions are approximately 16 m wide x 7 m high.

SPECIES COMPOSITIONCatch composition consists of 10 dominant fish species that comprise nearly 88% of the estimated biomass. The dominant species (by biomass) is the Giant Grenadier (Albatrossia pectoralis) and the most abundant fish species is the Popeye Grenadier (Coryphaenoides cinereus).

SURVEY PRODUCTSThe survey encounters approximately 150 fish and 325 invertebrate species. Scientists collect biological data on approximately 80 species of fish and invertebrates, including lengths, age structures, stomachs, genetic samples, and reproductive status. The new time series survey has completed an additional 60 scientific projects requested from universities, federal and state government agencies, NGOs and private researchers.

TAXONOMIC INSIGHTSFish taxonomists have identified at least 9 new species, 30 species that are new to the east-ern Bering Sea, and 24 species that were previously of dubious standing as part of the EBS slope fauna.

SURVEY DESIGNThe survey is of stratified random design with sampling effort reflecting the estimated area. The survey area is divided into six subareas which distinguish the four major canyons from the steeper inter-canyon areas. Each subarea is further divided into five 200 m depth strata between 200 and 1200 m. The survey is conducted during daylight hours from approximately June 1 to August 1 on a biennial even-year schedule. The total successful hauls completed during each survey year has varied between 111 and 231, however a recent level has been set at a goal of 200 each survey year.

A New Time Series: Eastern Bering Sea Upper Continental Slope Bottom Trawl Groundfish Survey

STOCK ASSESSMENTSThe EBS slope survey provides data for stock assessments of more than a dozen species. As the time series grows additional species will be included as data users expand stock assessments for deepwater taxa.

Slackline/Transfer

Door Leg Extension

Middle BridleExtension/Setback

Flying Wing

Upper Breast Lines

Bottom Contact Sensor

CodendLinerSplitting strapCowbell

Lower Bridle

Footrope / Roller Gear

locationmiddle of footrope

Upper BridleExtension/Setback

Scanmar / Netmindwire stop location

Middle Bridle

Headrope

Upper Bridle

Trawl Door #

¾” wire x 60’

¾” wire x 40’

½” LL chain x 9”

¾” wire x 19’6” w/disks

2 x 19’ 6”

Middle Breast Line30’ 6”

½” LL chain x 18”

Upper bridle 12”from nico press

x 180’

to specifications on plan

x 180’

89’ 1”

x 180’

2200 lbs

5 8”

Trawlwarp Attachment1 trawl shacklecenterhole on bale

1 8”

6 x 9 V door

Bottom Breast Line8’ 8”5 8”

4 Part Door Leg

LL chain

front 103”back 67”

single 59”

door hangingangle 35°- 40°

Floats8” x deep water

90 / 45 on ea. side

Flat Link1” Alloy Steel

Common Name Biomass

Giant Grenadier 48.50%

Pacific Ocean Perch 16.28%

Arrowtooth Flounder 5.63%

Popeye Grenadier 4.13%

Shortspine Thornyhead 2.98%

Western Eelpout 2.80%

Kamchatka Flounder 2.56%

Greenland Turbot 1.78%

Flathead Sole 1.69%

Aleutian Skate 1.60%

Subarea Depth (m)

Area (km2)

Hauls (n)

Density (km2/haul)

200-400 4012.41 21 191.07400-600 4062.77 36 112.85600-800 1741.66 13 133.97

800-1000 1354.74 5 270.951000-1200 1106.89 3 368.96

200-400 1157.64 7 165.38400-600 705.08 8 88.13600-800 591.27 5 118.25

800-1000 552.73 2 276.371000-1200 535.67 2 267.84

200-400 903.78 10 90.38400-600 886.11 4 221.53600-800 910.26 6 151.71

800-1000 732.35 2 366.181000-1200 675.52 2 337.76

200-400 1236.27 11 112.39400-600 730.35 4 182.59600-800 693.95 4 173.49

800-1000 707.59 4 176.901000-1200 662.42 2 331.21

200-400 423.71 3 141.24400-600 425.73 3 141.91600-800 431.83 2 215.91

800-1000 551.99 2 276.001000-1200 570.14 2 285.07

200-400 2595.79 12 216.32400-600 1705.76 12 142.15600-800 917.49 8 114.69

800-1000 645.17 3 215.061000-1200 496.42 2 248.21

Totals 200-1200 32723.49 200 mean 204.48

Newly Described (9 species)

Range Extension into EBS (30 species)

Confirmed to EBS (24 species)

Bothrocara nyx Acantholiparis opercularis Halargyreus johnsonii Anotopterus nikparini Polyacanthonotus challengeri

Careproctus n. sp. 1 Alepisaurus ferox Lycodapus dermatinus Benthalbella dentata Poromitra curilensis

Liparidae n. sp. 1 Allocareproctus jordani Lycodapus endemoscotus Careproctus bowersianus Psychrolutes phrictus

Liparidae n. sp. 2 Amblyraja badia Lycodapus pachysoma Careproctus ectenes Raja rhina

Liparidae n. sp. 3 Avocettina infans Lycodes parviceps Careproctus melanurus Rhinoliparis attenuatus

Liparidae n. sp. 4 Bajacalifornia megalops Magnisudis atlantica Coryphaenoides filifer Scopelosaurus adleri

Liparidae n. sp. 5 Bathyraja abyssicola Nannobrachium ritteri Coryphaenoides longifilis Sebastes variegatus

Paraliparis penicillus Bothrocara hollandi Nansenia candida Diaphus theta Sebastolobus macrochir

Rajidae n. sp. 1 Bothrocara zestum Notacanthus chemnitzii Lampanyctus jordani Sigmops gracilis

Bryozoichthys marjorius Paraliparis grandis Merluccius productus Squalus acanthias

Careproctus comus Paraliparis paucidens Paraliparis dactylosus Tactostoma macropus

Careproctus gilberti Rastrinus scutiger Paraliparis ulochir Zesticelus profundorum

Careproctus zachirus Rouleina attrita

Caristius macropus Sebastes melanostictus

Gigantactis vanhoeffeni Sebastolobus altivelis

Stock Assessments

Greenland Turbot

Arrowtooth Flounder

Kamchatka Flounder

Pacific Ocean Perch

Shortraker Rockfish

Rougheye Rockfish

Black-spotted Rockfish

Giant Grenadier

Popeye Grenadier

Pacific Grenadier

Giant Octopus

Other Octopus Species

Gerald R. HoffResource Assessment & Conservation Engineering,

Alaska Fisheries Science Center, NMFS, NOAA Seattle, WA

email: jerry.hoff@noaa.gov

For more information on the eastern Bering Sea Upper Continental Slope Survey visit the Websites:2010 Survey http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-224.pdf2008 Survey http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-197.pdf2004 Survey http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-156.pdf 2002 Survey http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-141.pdf For more information on trawling protocols and net and survey design visit the website:NOAA Trawl Protocols http://spo.nmfs.noaa.gov/tm/tm65.pdf

The recommendations and general contents presented in this poster do not necessarily represent the views or official position of the Department of Commerce, the National Oceanic and Atmospheric Administration or the National Marine Fisheries Service.

168°0'0"W

170°0'0"W

172°0'0"W

174°0'0"W

174°0'0"W176°0'0"W178°0'0"W180°0'0"

166°0'0"W

60°0'0"N

58°0'0"N

56°0'0"N

54°0'0"N

Subarea 1

Subarea 2Subarea 3

Subarea 4

Subarea 5

Subarea 6

Pribilof Islands

Nunivak Island

St. Matthew Island

A New Time Series: Eastern Bering Sea Upper Continental Slope … · 2011. 11. 2. ·...

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