Oceanographic data - Integrated acoustic and trawl survey of Pacific hake off the Pacific Coast

Integrated acoustic and trawl surveys are used to assess the distribution, biomass, and biology of Pacific hake along the Pacific coasts of the United States and Canada. Scientists from the Northwest Fisheries Science Center (NWFSC) and Department of Fisheries and Oceans-Canada are responsible for conducting the survey. The survey consists of a series of transects that are oriented generally east-west, and are spaced at a nominal 10-nautical mile interval. Sea depth at the nearshore end of individual transects is typically 50 m; offshore extents are typically at a depth of 1,500 m. Geographical coverage extends from near Morro Bay, CA north to Dixon Entrance. Acoustic data are collected during daylight hours with a Simrad EK60 scientific echo sounder coupled with the ER60 software system. Trawl samples from pelagic and bottom trawls are used to classify the observed backscatter layers to species and size composition and to collect specimens of Pacific hake and other organisms. Analysis of acoustic data involves identification and delineation of backscatter layers that are attributed to Pacific hake. The biomass estimate and length-at-age composition of Pacific hake generated from this survey are used in analysis and management of the stock. This survey is conducted on a biennial basis. There is a firm deadline for producing the biomass estimate in the middle of the December following the survey. Oceanographic data collected from CTDs, XBTs, SBEs, and the ADCP.

Data and Resources

Additional Info

Field Value
Last Updated June 21, 2019, 23:30
Created June 10, 2017, 17:29
access_constraints ["Access Constraints: Data access limited based on fileshare permissions | "]
bbox-east-long -123.3793
bbox-north-lat 50.4752
bbox-south-lat 40.3514
bbox-west-long -132.3937
contact-email sandy.parker-stetter@noaa.gov
coupled-resource []
dataset-reference-date [{"type": "creation", "value": "2001-06-01"}, {"type": "publication", "value": "2019-06-09"}]
frequency-of-update
guid gov.noaa.nmfs.inport:18471
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."]
metadata-date 2019-06-09T23:57:05
metadata-language eng
progress completed
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