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Estimated bycatch mortality of marine mammals in the Gulf of Mexico shrimp otter trawl fishery during 2012 to 2014
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2016
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Description:The Gulf of Mexico shrimp otter trawl fishery operates throughout the U.S. Waters of the Gulf of Mexico including coastal and shelf waters and bays, sounds and estuaries. The Atlantic and Gulf of Mexico shrimp fisheries are defined as a Category II fishery under the Marine Mammal Protection Act, and the Gulf of Mexico otter trawl fishery has the potential to impact Gulf of Mexico common bottlenose dolphin (Tursiops truncatus) and Atlantic spotted dolphin continental shelf stock, three bottlenose dolphin coastal stocks, and 31 bottlenose dolphin bay, sound and estuary (BSE) stocks. Total annual bycatch mortalities of marine mammals in the shrimp otter trawl fishery from 2012 - 2014 are estimated using data from NMFS's shrimp fishery observer program and stratified shrimp fishery effort models. By catch rates are calculated under two stratification scenarios and under two species identification assumptions. Annual mortality estimates for 2012, 2013, and 2014 are calculated using the ratio estimator with stratified annual fishery effort data for 2012 to 2014 and aggregate bycatch rates for 1997 to 2014. For each of the three years, 5-year unweighted mean mortality estimates are calculated for Gulf of Mexico dolphin stocks. BSE mortality estimates are aggregated at the state level. [doi:10.7289/V5/TM-SEFSC-697 (http://dx.doi.org/10.7289/V5/TM-SEFSC-697)]
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Content Notes:Melissa S. Soldevilla, Lance P. Garrison, Elizabeth Scott-Denton, Rick A. Hart..
"November 2016."
System requirements: Adobe Acrobat Reader.
Includes bibliographical references (pages 21-24).
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Rights Information:Public Domain
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