| 2010-2011 HPTRP consequential bycatch and compliance rates - :4093 | National Marine Fisheries Service (NMFS)
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2010-2011 HPTRP consequential bycatch and compliance rates
  • Published Date:
    2012
Filetype[PDF - 1.66 MB]


Details:
  • Corporate Authors:
    Northeast Fisheries Science Center (U.S.)
  • Description:
    "The New England component of the Harbor Porpoise Take Reduction Plan (HPTRP) requires the use of specified acoustic deterrent devices (known as pingers) on sink gillnet gear to reduce incidental entanglement of harbor porpoise during the course of sink gillnet fishing operations. The 2010-2011 HPTRP gillnet management season for the New England component of the HPTRP was the first season for which harbor porpoise bycatch rates were evaluated against 2010 HPTRP target bycatch rates to inform decisions regarding Consequence Closure Areas (CCAs); if the average bycatch rate from two consecutive management seasons in CCAassociated areas exceeds the HPTRP target bycatch rates, the HPTRP calls for seasonal closure of the relevant CCA(s). Bycatch rates and HPTRP compliance rates were calculated for the Coastal Gulf of Maine (CGOM) and Southern New England (SNE) CCA-associated areas. With the addition of the At-Sea Monitor (ASM) data source in 2010, bycatch rates were calculated in two ways: using only the traditional Northeast Fisheries Observer Program (NEFOP) data and using a combination of the NEFOP and ASM data. For the CGOM CCA-associated areas, the NEFOP-only and joint NEFOP-ASM bycatch rates were the very similar, and both exceeded the target bycatch rate of 0.031. The CGOM CCA-associated areas NEFOP-only bycatch rate was 0.078 harbor porpoise per mton of landings, and the joint NEFOP-ASM bycatch rate was 0.074. For the SNE CCA-associated area the NEFOP-only bycatch rate of 0.012 was below the target bycatch rate of 0.023 harbor porpoise per mton of landings, though the joint NEFOP-ASM bycatch rate of 0.048 was above the target bycatch rate. Due to larger sample sizes and corresponding lower CVs, the joint NEFOP-ASM bycatch rates were considered to be more accurate. Differences between the two SNE CCA-associated area bycatch rates were considered to be due primarily to sample size, inter-annual variability, and chance. Full pinger deployment in the CGOM CCA-associated areas (where full deployment is considered having the correct number of pingers per net string regardless of pinger functionality) occurred on 82.5% of observed hauls. However, when pinger functionality was taken into consideration, HPTRP pinger compliance dropped to 41.2%. Full pinger deployment (again, regardless of pinger functionality) in the SNE CCA-associated area occurred on 64.7% of observed hauls and HPTRP pinger compliance remained at that level when pinger functionality was taken into consideration. Overall bycatch rates in the CGOM and SNE CCA-associated areas were similar to past years, though bycatch rates on hauls with the correct number of pingers deployed (regardless of functionality) were higher than expected. High bycatch rates on hauls with the correct number of pingers were attributed to a high degree of non-functioning pingers on these hauls. High bycatch rates relative to CCA target rates are attributed primarily to continued poor compliance with pinger deployment and functionality requirements"--Abstract.

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