Slide Menu
Search Help Show/Hide Menu
Short Citation:
Alaska Fisheries Science Center, 2024: AFSC/ABL: NPRB project 1106 Improved aging estimates for spiny dogfish,

Item Identification

Title: AFSC/ABL: NPRB project 1106 Improved aging estimates for spiny dogfish
Short Name: AFSC/ABL: NPRB project 1106 Improved aging estimates for spiny dogfish
Status: Completed
Publication Date: Unknown

The spiny dogfish (Squalus suckleyi, formerly Squalus acanthias, Ebert et al. 2010) is a small, long-lived and slow-growing shark, which is vulnerable to overfishing. Current methods for aging spiny dogfish are based on reading annuli from dorsal fin spines, which erode and may break. For the past 30 years, scientists have used an exponential relationship between the diameter of the spine and the number of annuli to estimate the number of missing annuli. Coupled with between-reader imprecision (CV = 19%), errors in estimation of worn annuli introduce uncertainty and bias into the aging process, resulting in large confidence intervals and imprecise growth, mortality, and recruitment estimates necessary for stock assessments. Using spines and vertebrae collected from spiny dogfish in the Gulf of Alaska, we aged the spines using conventional methods and vertebrae using the vertebral method. Data presented here includes the sample collection information, raw spine and vertebrae age read data and final annuli counts calculated from the multiple reads. This project was funded by NPRB and was a collaborative work between: AFSC age and growth lab, WA Dept Fish and Wildlife, NWFSC age and growth lab, Dr. Walter Bubley and UAF, and Bechtol Research


This dataset contains information gathered while improving aging estimates.


Loaded by FGDC Metadata Uploader, batch 5636, 03-16-2015 18:58

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

- Taxonomy (FGDC:taxonomy)

- Lineage (FGDC:lineage)


Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
None age
None growth

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
Maintenance Frequency: As Needed
Data Presentation Form: maps and data
Distribution Liability:

NPRB: No warranty expressed or implied is made regarding the accuracy utility of the data, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with the data. The NPRB shall not be held liable for improper or incorrect use of the data described or contained herein.

Data Set Credit: NPRB

Support Roles

Data Set Credit

CC ID: 193801
Date Effective From: 2015-03-16
Date Effective To:
Contact (Organization): North Pacific Research Board (NPRB)
Address: 1007 West 3rd Avenue, Suite 100
Anchorage, AK 99501
Phone: 907 644 6700

Data Steward

CC ID: 193800
Date Effective From: 2015-03-16
Date Effective To:
Contact (Person): Tribuzio, Cindy
Email Address:


CC ID: 193797
Date Effective From: 2015-03-16
Date Effective To:
Contact (Person): Tribuzio, Cindy
Email Address:

Metadata Contact

CC ID: 193795
Date Effective From: 2015-03-16
Date Effective To:
Contact (Person): MC, Metadata Coordinators
Email Address:


CC ID: 193798
Date Effective From: 2015-03-16
Date Effective To:
Contact (Person): Tribuzio, Cindy
Email Address:

Point of Contact

CC ID: 193796
Date Effective From: 2015-03-16
Date Effective To:
Contact (Person): Tribuzio, Cindy
Email Address:


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 193794
W° Bound: -168.68
E° Bound: -122.38
N° Bound: 60.25
S° Bound: 47.46

Gulf of Alaska and Southeast Alaska

Extent Group 1 / Time Frame 1

CC ID: 193793
Time Frame Type: Range
Start: 2011
End: 2015-01-30

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: 233663
Download URL:

Note: Dataset migrated by Dan Woodrich (AFSC data management coordinator) on 12/16/2021. Contact:

Technical Environment


Microsoft Excel

Data Quality

Completeness Report:


Conceptual Consistency:

Contact POC for further information

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 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.


Lineage Statement:

Contact the dataset POC for full methodology

Catalog Details

Catalog Item ID: 24030
GUID: gov.noaa.nmfs.inport:24030
Metadata Record Created By: Emily A Fergusson
Metadata Record Created: 2015-03-16 18:38+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