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

Metadata Updated: February 8, 2018

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. Raw acoustic backscatter (ER 60.raw) and Echolog 60 (Echoview.ek6) data files are logged.

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Metadata Date April 5, 2017
Metadata Created Date September 27, 2015
Metadata Updated Date February 8, 2018
Reference Date(s) (publication)
Frequency Of Update

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Harvested from NOAA CSW Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Date April 5, 2017
Metadata Created Date September 27, 2015
Metadata Updated Date February 8, 2018
Reference Date(s) (publication)
Responsible Party (); Northwest Fisheries Science Center (Point of Contact, Custodian)
Contact Email
Access Constraints Access Constraints: NA | Use Constraints: Disclaimer - While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, 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.
Bbox East Long -123.3793
Bbox North Lat 50.4752
Bbox South Lat 40.3514
Bbox West Long -132.3937
Coupled Resource
Frequency Of Update
Guid gov.noaa.nmfs.inport:18469
Harvest Object Id 0576fc27-347f-4f1d-b9d6-e1f15175de84
Harvest Source Id 2aed8e29-fc5b-4cde-aa66-fb1118fd705e
Harvest Source Title NOAA CSW Harvest Source
Metadata Language eng
Metadata Type geospatial
Progress onGoing
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2001-01-01

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