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DTSTART:20181104T020000
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UID:calendar.3550.field_date_time.0@www.umces.edu
DTSTAMP:20260415T203534Z
CREATED:20190118T192933Z
DESCRIPTION:May 8\, 2019 3:00pm to 4:00pm    \n    \n      \n\n\n    \n\n  
             \nInstitute of Marine & Environmental Technology\n      \n\n\n
 \n\n  \n\n    \n\n              \n\n\n      \n  \n\n    \n\n              
 \n\n\nTitle: Sea turtle bycatch in shrimp trawls: a conservation success s
 tory?\n\n\n\nSpeaker: Dr. Elizabeth A. Babcock (Associate Professor\, Univ
 ersity of Miami)\n\n\n\nAbstract: The incidental capture\, or bycatch\, of
  sea turtles in shrimp trawl fishery is a major source of mortality and a 
 significant management concern. Measures to reduce bycatch have been imple
 mented\, such as the required use of turtle excluder devices (TEDs) beginn
 ing in the early 1990s. The NOAA Shrimp Trawl Observer Program assigns obs
 ervers to shrimp otter trawl vessels in both the Gulf of Mexico (GOM) and 
 the waters off the U.S. east coast within the jurisdiction of the South At
 lantic Fishery Management Council (SATL)\, and vessel participation has be
 en mandatory since 2007. We applied integrated Bayesian models to the obse
 rver data to estimate sea turtle bycatch. We also estimated mortality\, de
 fined as the total number of sea turtles that were caught in shrimp trawls
  and died at the time of capture. The total bycatch mortality was estimate
 d by multiplying the probability of mortality for turtles caught in shrimp
  trawl nets by the total bycatch estimated from a linear model of catch pe
 r unit effort (CPUE) per strata (area\, season\, depth zone\, time period)
  multiplied by the total effort in each stratum. Total bycatch mortality w
 as estimated separately for the GOM and the SATL\, and for standard shrimp
  otter trawl nets versus “try” nets\, which are small nets fishers deploy 
 in front of the primary nets to test catch rates. About 30% of sea turtles
  caught in standard nets were dead\, while less than 1% of sea turtles cau
 ght in try nets were dead. Thus\, although many Kemp’s ridley\, loggerhead
 \, and green sea turtles were caught in try nets in both regions\, few of 
 them were killed. For example\, in the GOM in 2015\, we estimated 95% cred
 ible intervals of 54-256 Kemp’s ridley\, 173-495 loggerhead and 22-114 gre
 en sea turtles caught in try nets\, but only 0-7 Kemp’s ridley\, 0-17 logg
 erheads\, and 0-3 green sea turtles were estimated to be killed. On the ot
 her hand\, for standard nets in the GOM\, we estimated 95% credible interv
 als of 63-369 Kemp’s ridley\, 18-105 loggerhead and 75-226 green sea turtl
 es captured\, corresponding to mortality of 19-130 Kemp’s ridley\, 5-36 lo
 ggerhead and 22-81 green sea turtles killed. Total bycatch mortality of Ke
 mp’s ridley and loggerhead sea turtles in standard nets decreased from 200
 7 to 2015 in the GOM\, but green sea turtle bycatch stayed constant. There
  was no trend over time in the SATL from 2007 to 2016\, and total mortalit
 y in standard nets in 2016 was on the order of 5-111 Kemp’s ridley turtles
 \, 9-139 loggerhead turtles\, 2-86 green sea turtles\, and 13-168 of unkno
 wn/other species of turtles. These estimates of total bycatch mortality fr
 om the observer data are much lower than values estimated in other studies
 \, such as those that incorporated nest counts and strandings data to esti
 mate the number of turtles that must have been killed in fisheries to expl
 ain observed trends in sea turtle abundance. The current study shows that 
 sea turtle mortality in shrimp trawls appears to be much lower than previo
 usly thought\, perhaps because of the effectiveness of TEDs. However\, it 
 is also possible that post escape mortality is higher than expected\, or t
 hat there is high mortality of turtles captured in coastal fisheries that 
 are not well sampled by the federal observer program.\n\n\n\nHost: Dr. Soo
 k Chung
DTSTART;TZID=America/New_York:20190508T150000
DTEND;TZID=America/New_York:20190508T160000
LAST-MODIFIED:20190506T125224Z
SUMMARY:IMET Seminar: Dr. Elizabeth A. Babcock (Associate Professor\, Unive
 rsity of Miami)
URL;TYPE=URI:https://www.umces.edu/events/imet-seminar-dr-elizabeth-babcock
 -associate-professor-university-miami
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