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Obsolete - AFSC/RACE/EcoFOCI - Otolith measurements and analyses performed in support of FOCI assessment surveys and ecosystem observations in the Bering, Beaufort, and Chukchi Seas and the Gulf of Alaska. 1995 - Present

Metadata Updated: April 1, 2024

Otolith data are collected to measure age and growth of larval pollock. They are used to determine whether growth rate, hatch data and/or temperature influence fish size.

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.

Downloads & Resources

Dates

Metadata Date February 29, 2024
Metadata Created Date October 28, 2022
Metadata Updated Date April 1, 2024
Reference Date(s) 2015 (publication)
Frequency Of Update annually

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) 2015 (publication)
Responsible Party (Point of Contact, Custodian)
Contact Email
Guid gov.noaa.nmfs.inport:26374
Access Constraints Cite As: Alaska Fisheries Science Center, [Date of Access]: Obsolete - AFSC/RACE/EcoFOCI - Otolith measurements and analyses performed in support of FOCI assessment surveys and ecosystem observations in the Bering, Beaufort, and Chukchi Seas and the Gulf of Alaska. 1995 - Present [Data Date Range], https://www.fisheries.noaa.gov/inport/item/26374., Access 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. Data will reside at the Alaska Fisheries Science Center., Use Constraints: 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.
Bbox East Long -130
Bbox North Lat 65
Bbox South Lat 50
Bbox West Long 170
Coupled Resource
Frequency Of Update annually
Harvest Object Id 28b46b2a-111d-49b8-8e6d-4f134f25c523
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 Larval walleye pollock were collected from three areas of interest in the GOA: Shumagin Islands, Sutwik Island, and Shelikof Strait during the late larval surveys conducted within the last 2 weeks in May 2000 and 2001, but as late as early June in 2000 in Shelikof Strait (Fig. 1). Whenever possible, the same stations from 2000 to 2001 were selected for otolith analyses. All stations were 18.5 km apart. Larvae were sampled with a 60-cm bongo frame equipped with 505-lm mesh nets and codends. The nets were towed to a maximum depth of 100 m, or in shallow areas 10 m off bottom. A Sea-Bird Electronics1 SBE-19 SEACAT profiler CTD was attached on the wire above the bongo frame to acquire in situ environmental data. Larvae were quickly sorted from one of the codends and preserved in 95 % ethanol for otolith analysis. The contents of the other codend were preserved in 1.8 % buffered formaldehyde for quantitative sorting of all larvae. All formaldehyde-preserved larvae were removed, enumerated, and their SL measured (±0.1 mm) with a dissection microscope. Up to 50 larvae preserved in ethanol from each area/year were selected to represent the full size range of fish occurring in each area. The Standard Length of larvae used for otolith analysis was corrected for shrinkage according to Porter et al. (2001). Sagitta otoliths were dissected from the fish and mounted in clear nail polish for age reading at 1,0009 magnification using a Zeiss Axioskop compound microscope. Age and length data were used to calculate linear growth equations.|Annette - can you add this?|||Dougherty, A., Bailey, K., Vance, T., and Cheng, W. 2012. Underlying causes of habitat-associated differences in size of age-0 walleye pollock (Theragra chalcogramma) in the Gulf of Alaska. Marine Biology, 159, 1733–1744
Metadata Language eng
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[170.0, 50.0], [-130.0, 50.0], [-130.0, 65.0], [170.0, 65.0], [170.0, 50.0]]]}
Progress underDevelopment
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 1995

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