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Short Citation:
Alaska Fisheries Science Center, 2023: AFSC/ABL: Lynn Canal Overwinter Acoustic Survey, 2004-2005,

Item Identification

Title: AFSC/ABL: Lynn Canal Overwinter Acoustic Survey, 2004-2005
Short Name: AFSC/ABL: Lynn Canal Overwinter Acoustic Survey, 2004-2005
Status: Completed
Publication Date: Unknown

The acoustic trawl database for Lynn Canals echo-trawl survey was conducted from 2001 to 2004 throughout southern Lynn Canal in southeast Alaska. Acoustic surveys were conducted one day per month and trawl surveys were conducted every 3 months to verify acoustic signals and collect biological data. This study was conducted to study the relationship between Steller sea lions (Eumetopias jubatus) and their prey. Additional acoustic surveys were conducted throughout the winter of 2004 to 2005 on 6 consecutive days once a month in order to study forage fish hots spots. Acoustic equipment were calibrated before every trawl survey. Acoustic data were analyzed by the same qualified acoustician throughout the surveys duration with calibrations entered into the analytical software after each calibration. Trawls were used to identify the fish species associated with a specific acoustic signal and to get length weight data per species. Trawl data were also used to enumerate and identify all nekton found within the study area and to generate length frequencies, species composition and abundance by species and season. The acoustic data was use to generate biomass estimates for Pacific herring 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 acoustic surveys from 2004 and 2005.


Loaded by FGDC Metadata Uploader, batch 7178, 10-05-2015 18:14


Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
ITIS herring
ITIS Steller sea lion
None diet
None echo-integration
None foraging
None hydroacoustics
None Prey availability
None prey selection

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: Image (digital)
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: 228835
Date Effective From: 2015-10-01
Date Effective To:
Contact (Person): Csepp, Dave
Email Address:


CC ID: 228836
Date Effective From: 2015-10-01
Date Effective To:
Contact (Person): Csepp, Dave
Email Address:

Metadata Contact

CC ID: 228826
Date Effective From: 2015-10-05
Date Effective To:
Contact (Person): MC, Metadata Coordinators
Email Address:


CC ID: 228827
Date Effective From: 2015-10-05
Date Effective To:
Contact (Person): Csepp, Dave
Email Address:

Point of Contact

CC ID: 228837
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: 228825
W° Bound: -135.1772
E° Bound: -134.7554
N° Bound: 58.5819
S° Bound: 58.4156

Alaska, Southeast Alaska, Lynn Canal, Favorite Channel

Extent Group 1 / Time Frame 1

CC ID: 228824
Time Frame Type: Range
Start: 2004-10
End: 2005-04

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: 233692
Download URL:

NCEI to be determined

Technical Environment


Acoustic data raw files

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: 228831

Gillnet herring schools using herring specific gillnet geometry.

Process Step 2

CC ID: 228832

Collect hydro-acoustic data using Simrad EK60 38 kHz split beam system; with appropriate calibration on standardized survey transects run daily for 6 days each month from October 2004 to April 2005.

Process Step 3

CC ID: 228833

Acoustic data were analyzed using Echoview software producing NASC values, school locations and size.

Process Step 4

CC ID: 228834

Age, length, weight, lipid and nutritional data were collected from herring samples collected.

Catalog Details

Catalog Item ID: 27708
GUID: gov.noaa.nmfs.inport:27708
Metadata Record Created By: Emily A Fergusson
Metadata Record Created: 2015-10-05 18:13+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-05-30 18:10+0000
Metadata Record Published: 2016-05-18
Owner Org: AFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2016-05-18
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2017-05-18