Water Column Sonar Data Collection (SH1610, EK60)
1. Use paired midwater trawls to evaluate potential selectivity of Pacific hake age/size
classes by different codend liners (Standard AWT 32 mm versus 7 mm used by DFO on
their Cantrawl) in the Aleutian wing trawl 24/20 (AWT). Midwater trawling for this
research will take place on all three survey legs.
2. Use paired trawls to evaluate performance of net with and without the marine mammal excluder installed.
3. Test a larger kite on the AWT for stability and ease of use with headrope sensors.
4. Continuously sample multi-frequency acoustic backscatter data using the ship?s Simrad EK60, EK80, and ME70 scientific echo sounder systems to estimate the distributions and abundances of hake, myctophids, gelatinous zooplankton, and krill.
5. Conduct research using the EK80 to distinguish between hake, myctophids, and rockfish. Compare EK80 backscatter signature with that of the EK60.
6. Optically observe fish behavior inside daytime trawls using a video or stereo camera and lights mounted inside the net. Test stereo camera system for quantifying fish species and length.
7. Collect a variety of other acoustic, biological, and oceanographic samples to characterize the biotic and abiotic environments and predator-prey interactions of the surveyed species.
8. Investigate near-field calibration techniques.
9. Use night operations time to conduct hydrographic measurements with a CTD. A NWFSC dissolved O2 sensor will also be mounted on the CTD.
10. Sample profiles of temperature and salinity using an underway conductivitytemperature-depth (CTD) system during daytime operations.
11. Continuously sample air temperature, barometric pressure, and wind speed and direction using the ship?s integrated weather station.
2. Use paired trawls to evaluate performance of net with and without the marine mammal excluder installed.
3. Test a larger kite on the AWT for stability and ease of use with headrope sensors.
4. Continuously sample multi-frequency acoustic backscatter data using the ship?s Simrad EK60, EK80, and ME70 scientific echo sounder systems to estimate the distributions and abundances of hake, myctophids, gelatinous zooplankton, and krill.
5. Conduct research using the EK80 to distinguish between hake, myctophids, and rockfish. Compare EK80 backscatter signature with that of the EK60.
6. Optically observe fish behavior inside daytime trawls using a video or stereo camera and lights mounted inside the net. Test stereo camera system for quantifying fish species and length.
7. Collect a variety of other acoustic, biological, and oceanographic samples to characterize the biotic and abiotic environments and predator-prey interactions of the surveyed species.
8. Investigate near-field calibration techniques.
9. Use night operations time to conduct hydrographic measurements with a CTD. A NWFSC dissolved O2 sensor will also be mounted on the CTD.
10. Sample profiles of temperature and salinity using an underway conductivitytemperature-depth (CTD) system during daytime operations.
11. Continuously sample air temperature, barometric pressure, and wind speed and direction using the ship?s integrated weather station.
- Cite as: Northwest Fisheries Science Center. 2016. Water Column Sonar Data Collection (SH1610, EK60). National Centers for Environmental Information, NOAA. doi:10.7289/V55X2786 [access date]
- SH1610_EK60
- doi:10.7289/V55X2786
- NCEI Metadata ID:gov.noaa.ngdc.mgg.wcd:SH1610_EK60
gov.noaa.ngdc.mgg.wcd:SH1610_EK60
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Distribution Formats |
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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 | 2016-06-29T20:29:40 to 2016-08-14T17:22:45 |
Spatial Reference System | urn:ogc:def:crs:EPSG::4326Vertical Datum: Unknown |
Spatial Bounding Box Coordinates |
West:-127.22231
East:-122.40387
South:40.94772
North:49.2834
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Spatial Coverage Map |
General Documentation |
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Associated Resources |
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Publication Dates |
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Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Not planned |
Purpose | NWFSC-led investigations of Pacific hake (Merluccius productus) and joint survey methods, life history, and associated ecosystem components (trophic structure and oceanography) will be conducted during CCE16 Legs I (30 June to 13 July), Leg II (17 July - 30 July), and Leg III (3 August to 14 August). |
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Theme keywords | Global Change Master Directory (GCMD) Science Keywords
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Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
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Instrument keywords | 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