| A calibration function for correcting mean net spread values obtained from Marport spread sensors used in conjunction with the Marport MK II receiver - :4740 | National Marine Fisheries Service (NMFS)
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A calibration function for correcting mean net spread values obtained from Marport spread sensors used in conjunction with the Marport MK II receiver
  • Published Date:
    2014
Filetype[PDF-939.04 KB]


Details:
  • Corporate Authors:
    Alaska Fisheries Science Center (U.S.)
  • Description:
    "Acoustic net mensuration is used on chartered Alaska Fisheries Science Center (AFSC) bottom trawl (BT) survey vessels to monitor and record net spread during standard survey operations. Net spread measurements are a critical component for calculating area swept by the survey BT at each station (Alverson and Pereyra 1969). Area swept estimates are used to extrapolate catch sample weights and numbers to estimate survey abundance and biomass of commercially important bottom fishes and crabs to monitor their population trends (BSAI Groundfish Plan Team 2013). By the late 2000s, the existing inventory of the AFSC's acoustic net mensuration sensors and receivers, produced by either Scanmar or Netmind, Northstar Technical, Inc., were aging and becoming increasingly unreliable and costly to maintain and repair; hence, replacements had to be found. In 2009, the AFSC committed to replacing its inventory with sensors and receivers produced by a new and different manufacturer, Marport Deep Sea Technologies, Inc.. By 2013, the AFSC had purchased a sufficient quantity of Marport MK II acoustic receivers and net mensuration sensors to completely outfit its primary bottom trawl surveys"--Introduction.

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