Midwater trawl comparison study for acoustic surveys of walleye pollock (Gadus chalcogrammus) in Alaska

Details

• Personal Author:
  Williams, K. ; Kotwicki, S.
• Corporate Authors:
  Alaska Fisheries Science Center (U.S.). Resource Assessment and Conservation Engineering Division
• NOAA Program & Office:
  NMFS (National Marine Fisheries Service) ; AFSC (Alaska Fisheries Science Center)
• Description:
  Midwater trawling is a critical component of acoustic-trawl fisheries surveys, and it is used to determine the species and size composition of acoustically sampled fish schools. Changes in midwater trawl gear can influence the catch, and therefore potentially bias the survey data. The Alaska Fisheries Science Center conducts acoustic-trawl surveys of walleye pollock (Gadus chalcogrammus) in Alaska waters and recently switched to a new midwater LFS1421 trawl (LFS) from an older Aleutian Wing Trawl (AWT).
• Keywords:
  • Midwater
  • Acoustic-trawl
  • Walleye pollock
  • Escapement
• Series:
  NOAA technical memorandum NMFS-AFSC 484
• DOI:
  https://doi.org/10.25923/ttx4-5y37
• Format:
  PDF
• Document Type:
  Technical Memorandum
• License:
  https://creativecommons.org/publicdomain/zero/1.0/
• Rights Information:
  CC0 Public Domain
• Compliance:
  Submitted
• Download URL:
  https://repository.library.noaa.gov/view/noaa/60746/noaa_60746_DS1.pdf
• File Type:
  [PDF - 3.70 MB]
• Collection(s):
  National Marine Fisheries Service (NMFS)
• Main Document Checksum:
  urn:sha-512:1fb78e0f2d7742ea8cee145041702f5c15d8d8ae4c676b39d53f0b0329c052950c209435441f8412527489916cd884334de0ea3969cbe3ddce09bd95fbdb78f0