| Estimated bycatch of marine mammals and sea turtles in the U.S. Atlantic pelagic longline fleet during 2009 - :3907 | National Marine Fisheries Service (NMFS)
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Estimated bycatch of marine mammals and sea turtles in the U.S. Atlantic pelagic longline fleet during 2009
  • Published Date:
    2010
Filetype[PDF-1.64 MB]


Details:
  • Corporate Authors:
    Southeast Fisheries Science Center (U.S.)
  • Description:
    The U.S. Atlantic pelagic long line fleet operates throughout the northwestern Atlantic Ocean, including along the U.S. coast from the Gulf of Mexico to New England, the waters of the Caribbean, and in international waters of the North Atlantic Ocean. The Atlantic longline fleet is defined as a Category I fishery under the Marine Mammal Protection Act, and it is also the subject of management under the Endangered Species Act due to interactions with leatherback (Dermochelys coriacea) and loggerhead (Caretta caretta) turtles. Total bycatch of marine mammals and turtles in the longline fishery was estimated for 2009 using data from the pelagic longline fishery observer program and a mandatory fishery logbook reporting program. The authors applied a delta-lognormal approach to estimate region specific and total annual interactions with protected species in the fishery. During 2009, there were an estimated 285.8 (209.6 - 389.7 [95% CI]) interactions with leatherback turtles and 242.9 (167.9 - 351.2 [95% CI]) interactions with loggerhead turtles. The primary marine mammals interacting with this fishery were pilot whales (Globicephala sp.) with an estimated 35.7 (14.0 - 90.6 [95% CI]) interactions and Risso's dolphins (Grampus griseus)with 38.5 (16.0 - 92.6 [95% CI]) interactions. Potential sources of bias and uncertainty in these by catch estimates are discussed. The estimates for each of these species are lower than prior years, and the estimated bycatch of loggerhead turtles is substantially lower than that occurring since 2006.

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