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AFSC/ABL: NPRB project 1106 Improved aging estimates for spiny dogfish

Metadata Updated: April 1, 2024

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

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Date February 29, 2024
Metadata Created Date October 28, 2022
Metadata Updated Date April 1, 2024
Reference Date(s) (publication)
Frequency Of Update asNeeded

Metadata Source

Harvested from NMFS AFSC

Additional Metadata

Resource Type Dataset
Metadata Date February 29, 2024
Metadata Created Date October 28, 2022
Metadata Updated Date April 1, 2024
Reference Date(s) (publication)
Responsible Party (Point of Contact, Custodian)
Contact Email
Guid gov.noaa.nmfs.inport:24030
Access Constraints Cite As: Alaska Fisheries Science Center, [Date of Access]: AFSC/ABL: NPRB project 1106 Improved aging estimates for spiny dogfish [Data Date Range], https://www.fisheries.noaa.gov/inport/item/24030., Access Constraints: There are no legal restrictions on access to the data. They reside in public domain and can be freely distributed., 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 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.
Bbox East Long -122.38
Bbox North Lat 60.25
Bbox South Lat 47.46
Bbox West Long -168.68
Coupled Resource
Frequency Of Update asNeeded
Harvest Object Id 71c14fa2-1736-44e5-aaa8-05c5fbb6bec1
Harvest Source Id 26a29bb9-50b0-47fd-920b-edc74aa6ec76
Harvest Source Title NMFS AFSC
Licence NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
Lineage Contact the dataset POC for full methodology
Metadata Language eng
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-168.68, 47.46], [-122.38, 47.46], [-122.38, 60.25], [-168.68, 60.25], [-168.68, 47.46]]]}
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2011
Temporal Extent End 2015-01-30

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