| New England Harbor porpoise bycatch rates during 2010-2012 associated with consequence closure areas - :4194 | National Marine Fisheries Service (NMFS)
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New England Harbor porpoise bycatch rates during 2010-2012 associated with consequence closure areas
  • Published Date:
    2012
Filetype[PDF-1.10 MB]


Details:
  • Personal Authors:
  • Corporate Authors:
    Northeast Fisheries Science Center (U.S.)
  • Description:
    "The New England component of the Harbor Porpoise Take Reduction Plan (HPTRP) requires bycatch rates to be below HPTRP target bycatch rates in specified areas when averaged over two consecutive management seasons to avoid seasonal closure of Consequence Closure Areas (CCAs). Bycatch rates and HPTRP compliance rates were calculated for the Coastal Gulf of Maine (CGOM) and Southern New England (SNE) CCA-associated areas for the 2011-2012 HPTRP management season and combined with previous estimates from the 2010-2011 season (Orphanides and Palka 2012). Bycatch rates (harbor porpoise per metric ton of landings) during the 2011-2012 season calculated using Northeast Fisheries Observer Program (NEFOP) data were 0.043 (CV=36%) in CGOM and 0.029 in SNE (CV=54%). The resulting two-year average bycatch rates (2010-2012) were 0.057 (CV=25%) in CGOM and 0.020 in SNE (CV=47%). These rates were above the target bycatch rate in CGOM (0.031) and below the target bycatch rate in SNE (0.023). For comparative purposes, bycatch rates were also calculated using a combination of At-Sea Monitor (ASM) data, a data source which began in 2010, and the traditionally used NEFOP data. Joint 2011-2012 NEFOP-ASM bycatch rates were 0.038 (CV= 23%) for CGOM and 0.035 (CV= 46%) for SNE, resulting in two-year bycatch rates of 0.053 (CV= 14%) in CGOM and 0.042 (CV= 32%) in SNE. Compliance with HPTRP pinger regulations was also evaluated. HPTRP pinger compliance (pingers fully deployed and all fully functional) was estimated to be 62.0% in CGOM and 73.2% in SNE"--Abstract.

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