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Short Citation:
Alaska Fisheries Science Center, 2023: AFSC/ABL: Frederick Sound Echo-integrated Trawl Survey, 2001 to 2004,

Item Identification

Title: AFSC/ABL: Frederick Sound Echo-integrated Trawl Survey, 2001 to 2004
Short Name: AFSC/ABL: Frederick Sound Echo-integrated Trawl Survey, 2001 to 2004
Status: Completed
Publication Date: Unknown

The acoustic trawl database for Frederick Sounds echo-trawl survey was conducted from 2001 to 2004. The surveys were conducted throughout most of the southern part of Stephens Passage and Frederick Sound in southeast Alaska and all their adjoining bays. Acoustic and trawl surveys were conducted every 3 months to verify acoustic signals and to collect biological data. This study was conducted to study the relationship between Steller sea lions (Eumetopias jubatus) and their prey. Acoustic equipment were calibrated before every trawl survey. Trawls were used to identify the fish species associated with a specific acoustic signal and to get length weight data per species. Acoustic data were analyzed by the same qualified acoustician throughout the surveys duration with calibrations entered into the analytical software after each calibration.

Trawl data were used to enumerate and identify all nekton found within the study area and to generate length frequencies, species composition and abundance by season. The acoustic data was use to generate biomass estimates for Pacific herring, Pacific hake and walleye pollock. Longlines were deployed to better identify and enumerate the benthic species not usually caught in pelagic trawls.


This dataset contains the data from the echo-integrated trawl survey from 2001 to 2004.


Loaded by FGDC Metadata Uploader, batch 7180, 10-05-2015 18:48


Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
ITIS Pacific hake
ITIS Pacific herring
ITIS walleye pollock
None acoustics
None demersal
None echo integration trawl survey
None longline
None pelagic

Spatial Keywords

Thesaurus Keyword
Geographic Names Information System Alaska

Physical Location

Organization: Alaska Fisheries Science Center
City: Seattle
State/Province: WA
Country: USA

Data Set Information

Data Set Scope Code: Data Set
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: 229024
Date Effective From: 2015-10-01
Date Effective To:
Contact (Person): Csepp, Dave
Email Address:


CC ID: 229025
Date Effective From: 2015-10-01
Date Effective To:
Contact (Person): Csepp, Dave
Email Address:

Metadata Contact

CC ID: 228873
Date Effective From: 2015-10-05
Date Effective To:
Contact (Person): MC, Metadata Coordinators
Email Address:


CC ID: 228874
Date Effective From: 2015-10-05
Date Effective To:
Contact (Person): Vollenweider, Johanna
Email Address:


CC ID: 228875
Date Effective From: 2015-10-05
Date Effective To:
Contact (Person): Csepp, Dave
Email Address:

Point of Contact

CC ID: 229026
Date Effective From: 2015-10-01
Date Effective To:
Contact (Person): Csepp, Dave
Email Address:


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 228872
W° Bound: -134.5
E° Bound: -133.5
N° Bound: 57.167
S° Bound: 56

Alaska, Southeast Alaska, Stephens Passage, Frederick Sound

Extent Group 1 / Time Frame 1

CC ID: 228871
Time Frame Type: Range
Start: 2001-06
End: 2004-05

Access Information

Security Class: Unclassified
Data Access Procedure:


Data Access Constraints:

There are no legal restrictions on access to the data. They reside in public domain and can be freely distributed.

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: 233696
Download URL:

NCEI to be determined

Technical Environment


Microsoft Excel Spreadsheet

Data Quality

Completeness Report:


Conceptual Consistency:

Acoustic equipment were tested through monthly calibrations. Data were checked throughout its analysis quantitatively and qualitatively throughout their analytical processes.

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?: Yes
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 site 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.


Process Steps

Process Step 1

CC ID: 228879

Echo integration-trawl surveys were conducted over 2700 km2 in Stephens Passage, Frederick Sound, and associated bays in southeastern Alaska every 3 months between June 2001 and May 2004.

Process Step 2

CC ID: 228880

Longline surveys were conducted in the same area from September 2003 to May 2004.

Process Step 3

CC ID: 228881

Standardized acoustic box surveys were run in Frederick sound and Stephens passage and zigzag transects in the bays. Trawls were run on all interesting sign, schools and layers to identify acoustic sign. A Simrad split beam 38 kHz system was used.

Process Step 4

CC ID: 228882

Samples were taken from both fishing methods for age, length, weight and nutritional analysis.

Catalog Details

Catalog Item ID: 27710
GUID: gov.noaa.nmfs.inport:27710
Metadata Record Created By: Emily A Fergusson
Metadata Record Created: 2015-10-05 18:47+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