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    • AFSC/RACE/GAP/Nichol: Archival tag depth and temperature data from Pacific cod

    Metadata Updated: April 1, 2026

    Data from 250 recaptured (624 released) depth and temperature recording archival (data storage) tags attached to Pacific cod off Kodiak Island and in the eastern Bering Sea from 2001 to 2003, were used to describe the vertical movement patterns of Pacific cod. Three publications resulted from the research with subject matter including: 1) P. cod behavior as related to barotrauma; 2) P. cod vertical distribution as related to survey trawl catchability; 3) P. cod diel vertical migration. Please see publications for more detail.

    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 March 4, 2026
    Metadata Created Date October 28, 2022
    Metadata Updated Date April 1, 2026
    Reference Date(s) (publication)
    Frequency Of Update

    Metadata Source

    Harvested from NMFS AFSC

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Date March 4, 2026
    Metadata Created Date October 28, 2022
    Metadata Updated Date April 1, 2026
    Reference Date(s) (publication)
    Responsible Party (Point of Contact, Custodian)
    Contact Email
    Guid gov.noaa.nmfs.inport:28006
    Access Constraints Cite As: Alaska Fisheries Science Center, [Date of Access]: AFSC/RACE/GAP/Nichol: Archival tag depth and temperature data from Pacific cod [Data Date Range], https://www.fisheries.noaa.gov/inport/item/28006., 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. Applications or inferences derived from the data should be carefully considered for accuracy. Acknowledgement of NOAA/NMFS/AFSC, as the source from which these data were obtained in any publications and/or other representations of these, data is suggested., Distribution Liability: The user is responsible for the results of any application of this data for other than its intended purpose. NOAA denies liability if the data are misused.
    Bbox East Long -152
    Bbox North Lat 60
    Bbox South Lat 54
    Bbox West Long -173
    Coupled Resource
    Frequency Of Update
    Harvest Object Id bc4be0ea-f897-4243-bf5b-f08c6c622079
    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 : A total of 624 Pacific cod were tagged with electronic data storage tags off Kodiak Island in the Gulf of Alaska, and off Unimak Island in the eastern Bering Sea from 2001 to 2003. There were two release sites off Kodiak Island (inside Kupreanof Strait and near Ugak bay), and three release sites off Unimak Island (off Cape Sarichef, off Amak Island, and off Akun Island). Cod were initially captured with pots and hook and line gear at bottom depths ranging from 32 to 127 m near Unimak Island (Table 1). Pots were steel-framed with dimensions of 2.1 × 2.1 × 0.9 m or 2.3 × 2.3 × 1.2 m, and 4 × 4 cm to 6 × 6 cm stretched nylon mesh. Pots were “soaked” during both daylight and night-time hours from 5.2 - 22 h off Kodiak Island and from 3.8 - 102 h off Unimak Island. Both pots and hook and line gear were retrieved at minimum rate of 20 m min-1. Captured cod were transferred to a tank supplied with running sea-water and were retained in the tank only long enough to determine if they could maintain buoyancy near the bottom of the tank without apparent difficulty and if they lacked serious external damage. Data storage tags were attached externally, beneath the anterior dorsal fin, using 0.5 mm stainless steel wire as described in Nichol and Somerton (2002). Cod were measured to the nearest centimeter total length (TL). Sizes of tagged cod ranged from 49 to 85 cm TL. Cod were released at the site of initial capture immediately after tagging. Data storage tags, Lotek Wireless LTD-1100, recorded depth and temperature. The tags had a maximum recording depth of 600 m, with accuracy of + 1.5 m if fish remained in less than 150 m, + 3 m if fish exceeded 150 m, and + 6 m if fish exceeded 300 m. Water temperature was recorded with an accuracy of + 0.3 ¿C. Frequency of data recordings decreased with time at liberty, starting at 14 s intervals and decreasing to 30 min intervals after 341 days. The average recording interval for tags in this study was 13 min. Tagged fish were captured in commercial trawl, pot, long-line and jig fisheries. A cash reward was provided as an incentive for returning tags. Capture information included latitude, longitude, depth, and date of capture. Specimen information included fish length, sex, and fish weight.
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-173.0, 54.0], [-152.0, 54.0], [-152.0, 60.0], [-173.0, 60.0], [-173.0, 54.0]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 2001
    Temporal Extent End 2005

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