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Short Citation:
Alaska Fisheries Science Center, 2023: AFSC/ABL: Gulf of Alaska Diel Trawl Survey, 2005-2006,

Item Identification

Title: AFSC/ABL: Gulf of Alaska Diel Trawl Survey, 2005-2006
Short Name: AFSC/ABL: Gulf of Alaska Diel Trawl Survey, 2005-2006
Status: Completed
Publication Date: Unknown

Diel epipelagic sampling for juvenile Pacific salmon (Oncorhynchus spp.), rockfish (Sebastes spp.), sablefish (Anoplopoma fimbria), and associated species was conducted in order to identify factors that may affect year-class success of these commercially important species. Sampling occurred in offshore marine habitats of the coastal northeast Pacific Ocean from 10-20 August 2005 and was conducted with a surface trawl fishing the upper 20 m of the water column along transects up to78 km offshore near 58 N. Three habitats were sampled along each transect over a 24-hr period: the continental shelf (<200 m depth), the continental slope (400-750 m depth), and the abyss (>2,000 m depth). A total of 38,747 fish and squid representing 24 species were sampled in 56 trawl hauls. Of the targeted juvenile fish species, a total of 587 salmon, 11 rockfish, and 70 sablefish were captured. Sampling during day (1500-1900) and night (2200-0200) periods indicated that biomass of fish and squid was 2-4 times higher at night at (each?)all habitat types pooled across transects. No distinct patterns between day or night occurrence were noted for juvenile pink salmon (O. gorbuscha), chum salmon (O. keta), sockeye salmon (O. nerka), or coho salmon (O. kisutch), however, juvenile Chinook salmon (O. tshawytscha) were encountered only at night. Catches of juvenile rockfish and juvenile sablefish were quite low in this study, and larger sample sizes of these fish are needed to adequately determine their diel distribution. Diel differences were apparent with forage species such as Pacific herring (Clupea pallasi), capelin (Mallotus villosus), and eulachon (Thaleichthys pacificus) that were almost exclusively sampled at night. The offshore distribution patterns of target species were distinctly different, with the most common occurrences of juvenile salmon over continental shelf habitats, juvenile sablefish over continental shelf and slope habitats, and juvenile rockfish over slope and abyss habitats. Pacific herring, capelin, eulachon, and Pacific sardines (Sardinops sagax) were found over continental shelf habitats, whereas small squid and myctophids occurred primarily at slope and abyssal habitats. The greatest overall catch biomass was of gelatinous species (jellyfish), which was consistently higher than that of all fish and squid combined, usually by an order of magnitude. Individual fish or squid species with highest average weight per haul were pomfret (Brama japonica), adult coho salmon, Humboldt squid (Dosidicus gigas), and blue sharks (Prionace glauca). The occurrence of the latter two warm-water species and Pacific sardines were of interest because this study occurred during an anomalously warm year and the capture of Pacific sardines and Humboldt squid represent northern range extensions for these species. Stomach content analysis of potential predator species of the target species showed that only adult coho salmon were predating on juvenile salmon and sablefish, and only pomfret were predating on juvenile rockfish. Further sampling of the target species is needed in these habitats during more normal environmental conditions to validate these observations.


This dataset contains data from the 2005 & 2006 Medeia Gulf of Alaska surveys


Loaded by FGDC Metadata Uploader, batch 7177, 10-05-2015 16:46

The following FGDC sections are not currently supported in InPort, but were preserved and will be included in the FGDC export:

- Taxonomy (FGDC:taxonomy)


Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
ITIS Pacific ocean perch
ITIS rockfish
ITIS Sebastes
ITIS sebastes alutus
None diel
None distribution
None epipelagic
None pelagic

Spatial Keywords

Thesaurus Keyword
Geographic Names Information System Alaska
Geographic Names Information System Gulf of Alaska
Geographic Names Information System Southeast Alaska

Physical Location

Organization: Auke Bay Laboratories
City: Juneau
State/Province: AK
Country: US

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Database
Maintenance Frequency: None Planned
Data Presentation Form: maps and data
Distribution Liability:

The user is responsible for the results of any application of this data for other than its intended purpose.

Support Roles

Data Steward

CC ID: 228806
Date Effective From: 2015-10-05
Date Effective To:
Contact (Person): Orsi, Joe
Email Address:


CC ID: 228660
Date Effective From: 2015-10-05
Date Effective To:
Contact (Person): Orsi, Joe
Email Address:

Metadata Contact

CC ID: 228658
Date Effective From: 2015-10-05
Date Effective To:
Contact (Person): MC, Metadata Coordinators
Email Address:


CC ID: 228661
Date Effective From: 2015-10-05
Date Effective To:
Contact (Person): Orsi, Joe
Email Address:


CC ID: 228662
Date Effective From: 2015-10-05
Date Effective To:
Contact (Person): Fergusson, Emily A
Address: 17109 Pt Lena Loop Road
Juneau, AL
Email Address:
Phone: 907-789-6613


CC ID: 228663
Date Effective From: 2015-10-05
Date Effective To:
Contact (Person): Echave, Katy
Email Address:

Point of Contact

CC ID: 228659
Date Effective From: 2015-10-05
Date Effective To:
Contact (Person): Orsi, Joe
Email Address:


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 228657
W° Bound: -137.893
E° Bound: -134.986
N° Bound: 58.35035
S° Bound: 57.44538

Gulf of Alaska

Extent Group 1 / Time Frame 1

CC ID: 228656
Time Frame Type: Range
Start: 2005
End: 2006

Access Information

Security Class: Unclassified
Data Access Procedure:


Data Access Constraints:

Contact the Point of Contact for data request form.

Data Use Constraints:

User must read and fully comprehend the metadata prior to use. Data should not be used beyond the limits of the source scale. Acknowledgement of NOAA, as the source from which these data were obtained, in any publications and/or other representations of these data is suggested.

Distribution Information

Distribution 1

CC ID: 233609
Download URL:

NCEI to be determined

Note: Dataset migrated by Dan Woodrich (AFSC data management coordinator) on 12/14/2021. Contact:

Technical Environment


Microsoft Access

Data Quality

Completeness Report:

The 2006 data has been entered into the database but has not been proof read.

Conceptual Consistency:


Quality Control Procedures Employed:

Contact the dataset POC for full QA/QC methodology

Data Management

Have Resources for Management of these Data Been Identified?: Yes
Approximate Percentage of Budget for these Data Devoted to Data Management: Unknown
Do these Data Comply with the Data Access Directive?: Yes
Is Access to the Data Limited Based on an Approved Waiver?: No
If Distributor (Data Hosting Service) is Needed, Please Indicate: yes
Approximate Delay Between Data Collection and Dissemination: unknown
If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed:

no delay

Actual or Planned Long-Term Data Archive Location: To Be Determined
If To Be Determined, Unable to Archive, or No Archiving Intended, Explain:

NCEI cite yet to be determined

Approximate Delay Between Data Collection and Archiving: unknown
How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?:

IT Security and Contingency Plan for the system establishes procedures and applies to the functions, operations, and resources necessary to recover and restore data as hosted in the Western Regional Support Center in Seattle, Washington, following a disruption.


Lineage Statement:

For methodology see: Orsi, J. A., D. M. Clausen, A. C. Wertheimer, D. L. Courtney, and J. E. Pohl. 2006. Diel Epipelagic Distribution of Juvenile Salmon, Rockfish, Sablefish and Ecological Interactions with Associated Species in Offshore Habitats of the Northeast Pacific Ocean (NPAFC Doc. 956) Auke Bay Lab., Alaska Fish. Sci. Cen., Nat. Mar. Fish. Serv., NOAA, 11305 Glacier Highway, Juneau, AK 99801-8626, USA, 26 p.

Process Steps

Process Step 1

CC ID: 228668

Contact POC for methodology

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity Catch
Entity Coded-wire Tags
Entity FMB
Entity Fish Codes
Entity Haul
Entity Lab Processing
Entity Onboard analysis (fish)
Entity Onboard analysis (stomach)
Entity Paste Errors
Entity Rank taxa names
Entity Station
Entity stomach prey categories

Catalog Details

Catalog Item ID: 17231
GUID: gov.noaa.nmfs.inport:17231
Metadata Record Created By: Doug Turnbull
Metadata Record Created: 2012-12-18 14:31+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-05-30 18:10+0000
Metadata Record Published: 2016-05-05
Owner Org: AFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2016-05-05
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2017-05-05