Water Column Sonar Data Collection (SH1601, EK60)
Scientists from the Fishery Resource Analysis and Monitoring (FRAM) division at the Northwest Fisheries Science Center (NWFSC) led the winter 2016 hake IAT survey aboard the NOAA Ship Bell M. Shimada, a 63.7-m (209-foot), acoustically quieted Fisheries Survey Vessel equipped for fisheries and oceanographic research. The survey was conducted between January 9 and February 9 (Table 1). The Shimada surveyed from 45.5°N to 31.3°N, beginning at
Newport, Oregon, proceeding south to the U.S./Mexico border, and then heading north back to Newport (Figures 1 and 2). Pre-planned (“coarse”) zigzag transects were oriented east-west, with larger offshore diagonals connected via smaller nearshore diagonals. Offshore diagonals, spaced roughly 100 nmi apart at the inshore side, ranged from the 30-m isobath (or as close to shore as was safely navigable) to bottoms depths of roughly 3,500–4,500 m. Nearshore
diagonals extended from the ≥30-m contour to roughly 2,000 m. If hake were detected at the offshore end of a transect, the vessel proceeded west to the end of the hake sign and then beyond for an additional 0.5 nmi to ensure that the end of the aggregation was located. When aggregations of spawning hake were detected along a pre-planned transect and confirmed by midwater trawling, adaptive transects, either parallel at a fine resolution (spaced either 0.5 or 1.0 nmi apart) or in a star pattern, were used to determine the spatial extent and size of the spawning aggregation(s). Additional acoustic data were collected to evaluate crepuscular migration (vertical and/or horizontal) of spawning hake aggregations by having the Shimada remain stationary one hour before sunrise to one hour after.
Newport, Oregon, proceeding south to the U.S./Mexico border, and then heading north back to Newport (Figures 1 and 2). Pre-planned (“coarse”) zigzag transects were oriented east-west, with larger offshore diagonals connected via smaller nearshore diagonals. Offshore diagonals, spaced roughly 100 nmi apart at the inshore side, ranged from the 30-m isobath (or as close to shore as was safely navigable) to bottoms depths of roughly 3,500–4,500 m. Nearshore
diagonals extended from the ≥30-m contour to roughly 2,000 m. If hake were detected at the offshore end of a transect, the vessel proceeded west to the end of the hake sign and then beyond for an additional 0.5 nmi to ensure that the end of the aggregation was located. When aggregations of spawning hake were detected along a pre-planned transect and confirmed by midwater trawling, adaptive transects, either parallel at a fine resolution (spaced either 0.5 or 1.0 nmi apart) or in a star pattern, were used to determine the spatial extent and size of the spawning aggregation(s). Additional acoustic data were collected to evaluate crepuscular migration (vertical and/or horizontal) of spawning hake aggregations by having the Shimada remain stationary one hour before sunrise to one hour after.
Dataset Citation
- Cite as: Northwest Fisheries Science Center. 2016. Water Column Sonar Data Collection (SH1601, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V5FF3QQV [access date]
Dataset Identifiers
- SH1601_EK60
- doi:10.7289/V5FF3QQV
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:SH1601_EK60
ISO 19115-2 Metadata
gov.noaa.ngdc.mgg.wcd:SH1601_EK60
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Ordering Instructions | Contact the NCEI Water Column Sonar Data Manager to order data. |
Distributor |
NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact |
NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact | Water Column Sonar Data Manager NOAA National Centers for Environmental Information (303) 497-4742 wcd.info@noaa.gov |
Time Period | 2016-01-07T21:43:41 to 2016-02-09T20:04:44 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West: -128.13003
East: -117.30221
South: 31.3234
North: 45.49275
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Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Not planned |
Purpose | The primary purposes of the winter 2016 hake Integrated Acoustic and Trawl (IAT) survey were to evaluate the feasibility of conducting a winter spawning hake biomass survey and to collect biological data on hake during winter. |
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Global Change Master Directory (GCMD) Science Keywords
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Global Change Master Directory (GCMD) Data Center Keywords
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Global Change Master Directory (GCMD) Instrument Keywords
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Place keywords |
International Hydrographic Organization (IHO) Sea Area ("Limits of Oceans and Seas" publication S-23)
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Lineage Statement | EK60 used three Simrad split-beam transducers, operating at 18, 38, and 120 kHz. The Simrad EK80 broadband echo sounder used 70- and 200-kHz transducers. |
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Last Modified: 2020-05-04
For questions about the information on this page, please email: ncei.info@noaa.gov
For questions about the information on this page, please email: ncei.info@noaa.gov