2017 Spawning Hake Stock Acoustic-Trawl Survey SH1701, EK80)

The primary goals of the survey are to characterize the winter distribution of hake, the hake aggregations, and the fish within those aggregations in order to support an evaluation of the feasibility of a future winter hake biomass survey. The project will use data from an integrated acoustic and trawl survey off the west coast of the U.S. from approximately south of San Diego, CA (latitude 31.6?N along the U.S. EEZ) to approximately Newport, OR (latitude 44.6?N). Our objectives are to: - Conduct 24-hour acoustic, trawl, oceanographic, and zooplankton operations. - Continuously sample multi-frequency acoustic backscatter data using the ship?s Simrad EK60 scientific echosounders (18, 38, and 120 kHz) system. Simrad EK80 broadband echosounders will operate at 70 and 200 kHz. Collectively, the acoustic data will be used to characterize the distribution of hake and describe hake aggregations. -- Collect acoustic data along pre-planned diagonal transects along the coast (hereafter ?transects?). -- Collect acoustic data over hake aggregations, where the design will be determined based on the observed aggregation (hereafter ?adaptive transects?). - Collect stationary acoustic data 1 hour before sunrise/sunset to 1 hour after sunrise/sunset to evaluate migration (vertical and/or horizontal) of hake aggregations. - Conduct daytime and nighttime trawling (Appendices 3 and 4) to verify hake aggregations and obtain specimens for biological data (length, sex, maturity, age, ovaries, diet, genetics, etc.). -- Multiple trawl samples may be taken on a single hake aggregation to evaluate heterogeneity in sex, maturity, etc. -- Record data from shipboard net mensuration gear to evaluate trawl performance - Use a portable x-ray system (Appendices 5 and 6) to take radiographic images of fish swimbladders - Optically verify the presence of non-hake scatterers during trawling using a video camera and light(s) attached to the upper panel of the midwater trawl approximately 20-30 meters forward of the codend. - Conduct vertical casts with the ship?s CTD rosette, outfitted with a dissolved oxygen sensor and Niskin bottles, at pre-planned stations along transects and/or at trawl locations (Appendix 2, Table 2, Table 4, and Table 5). These data will be used to describe the vertical and horizontal distributions of hake relative to oceanographic conditions. Niskin water collections will be filtered for evaluation of environmental DNA (eDNA). - Conduct underway CTD (uCTD) casts at pre-planned stations along transects (Appendix 2, Table 6). These data will be used to supplement oceanographic information obtained from the CTD rosettes and will be used to describe the distribution of hake relative to ocean conditions - Continuously collect Acoustic Doppler Current Profiler (ADCP) data along transects. These data will be used to describe the distribution of spawning hake relative to currents. - Conduct vertical ring net zooplankton tows at pre-planned stations along transects (Appendix 1, Figure 1; stations are listed in Appendix 2, Table 2) and bongo net tows (Appendix 1, Figure 1; stations are listed in Appendix 2, Table 3). These data will be used to describe the winter distribution of zooplankton species. - Continuously sample sea-surface temperature, salinity, and chlorophyll-a using the ship?s thermosalinograph and fluorometer. These data will be used to estimate the physical oceanographic habitats for spawning hake. - Continuously sample air temperature, barometric pressure, and wind speed and direction using the ship?s integrated weather station. - Collect broadband acoustic data with EK80 echosounders operating at central frequencies of 70 and 200 kHz. The use of the EK80s will require temporary modification to the ship?s EK60 set-up.

Data and Resources

Additional Info

Field Value
Last Updated August 23, 2018, 22:24
Created August 23, 2018, 22:24
access_constraints ["Cite as: Northwest Fisheries Science Center and Southwest Fisheries Science Center (2017): Water Column Sonar Data Collection (SH1701, EK80). National Centers for Environmental Information, NOAA. doi:10.7289/V5NZ8605 [access date]", "Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.", "Resource may not be available for up to one year after initial collection."]
bbox-east-long -117.30582
bbox-north-lat 45.5109
bbox-south-lat 30.78143
bbox-west-long -127.97099
contact-email sandy.parker-stetter@noaa.gov
coupled-resource []
dataset-reference-date [{"type": "creation", "value": "2017-01-11"}]
frequency-of-update notPlanned
guid gov.noaa.ngdc.mgg.wcd:SH1701_EK80
licence ["These data are considered raw and have not been subjected to the NOAA's quality control or quality assurance procedures. They are released for limited public use as preliminary data to be used only with appropriate caution. NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.", "Not subject to copyright protection within the United States."]
metadata-date 2018-07-31
progress completed
resource-type series
responsible-party [{"name": "NWFSC/FRAM/FEAT", "roles": ["principalInvestigator"]}]
spatial {"type": "Polygon", "coordinates": [[[-127.97099, 30.78143], [-117.30582, 30.78143], [-117.30582, 45.5109], [-127.97099, 45.5109], [-127.97099, 30.78143]]]}
spatial-reference-system urn:ogc:def:crs:EPSG:4326
spatial_harvester true
temporal-extent-begin 2017-01-11T23:41:49
temporal-extent-end 2017-02-11T21:17:11