AFSC/ABL: Rockfish Habitat Dive Video Transects

Metadata Updated: February 6, 2017

Many species of commercially valuable rockfish (Sebastes spp.) inhabit waters on the outer continental shelf in the Gulf of Alaska typically between depths of 100-300m. The benthic habitat requirements and spatial distribution of these rockfish species is relatively unknown. Information regarding benthic habitat use would improve current stock assessments and provide baseline information for an ecosystem approach to management. Several study areas in the Gulf of Alaska have recently been mapped with high resolution multibeam bathymetry and backscatter to generate detailed benthic habitat maps. Large populations of rockfish have been surveyed and harvested within these mapped areas. The NMFS MESA group conducted two submersible observation surveys in summer 2005 on three of these mapped areas, Albatross Bank, Hazy Islands, and Cape Ommaney. The objectives of these surveys were to collect information on rockfish habitat interactions and generate density estimates by habitat. Forty dive transects were completed on the mapped sites using the Delta two-person occupied submersible. We identified numerous gravid females and observed schooling behavior of several species over particular benthic habitats. Density estimates of rockfish using strip and line of sight methodologies are being determined by substrate and invertebrate habitat classification. We identify habitat types with high densities of rockfish species and describe differences between estimation methods.

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Metadata Date May 18, 2016
Metadata Created Date May 31, 2016
Metadata Updated Date February 6, 2017
Reference Date(s) (publication)
Frequency Of Update asNeeded

Metadata Source

Harvested from NOAA CSW Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Date May 18, 2016
Metadata Created Date May 31, 2016
Metadata Updated Date February 6, 2017
Reference Date(s) (publication)
Responsible Party Alaska Fisheries Science Center (Point of Contact)
Contact Email
Access Constraints Access Constraints: The data set is still being analyzed and will not be available for distribution until it has been finalized and all QA/QC practices have been performed. Contact the Data Point of Contact for estimated time of release. | Use Constraints: User must read and fully comprehend the metadata prior to use. User must acknowledge the Originator when using the data set as a source. User must share data products developed using the source data set with the Originator. Data should not be used beyond the limits of the source scale. | Distribution Liability: The user is responsible for the results of any application of this data for other than its intended purpose.
Bbox East Long -133.48
Bbox North Lat 56.87
Bbox South Lat 55.58
Bbox West Long -153.59
Coupled Resource
Frequency Of Update asNeeded
Guid gov.noaa.nmfs.inport:25151
Harvest Object Id 47e2edd2-9555-4063-abc5-e18e3440678e
Harvest Source Id 2aed8e29-fc5b-4cde-aa66-fb1118fd705e
Harvest Source Title NOAA CSW Harvest Source
Metadata Language eng
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2005-06-22
Temporal Extent End 2005-08-01

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