gov.noaa.nmfs.inport:28427
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Alaska Fisheries Science Center
7600 Sand Point Way N.E., Building 4
Seattle
WA
98115
USA
http://www.afsc.noaa.gov
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Website for this organization
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0700-1700 Pacific Time
resourceProvider
McCarthy, Abigail
abigail.mccarthy@noaa.gov
pointOfContact
2024-02-29T00:00:00
ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data
ISO 19115-2:2009(E)
NPRB711 Quantification of unobserved injury and mortality of Bering Sea crabs due to encounters with trawls on the seafloor
NPRB711 Quantification of unobserved injury and mortality of Bering Sea crabs
publication
NOAA/NMFS/EDM
28427
https://www.fisheries.noaa.gov/inport/item/28427
WWW:LINK-1.0-http--link
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View the complete metadata record on InPort for more information about this dataset.
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The potential for unobserved mortality of crabs encountering bottom trawls, but not captured, has long been a concern in the management of Bering Sea fisheries. We evaluated how many such crabs die, including snow, Tanner and red king crabs, and demonstrated changes to trawl gear that substantially improved crab survival.
Unobserved mortalities of non-target species are among the most troubling and difficult issues associated with fishing, especially when those species are targeted by other fisheries.This has long been the case for the effects of bottom trawling on three crab species of the Bering Sea that are targets of significant directed fisheries. Our research addressed the lack of data on the unobserved mortality rates for the three principal commercial crab species of the Bering Sea, red king crab (Paralithodes camtschaticus), Tanner crab (Chionoecetes bairdi) and snow crab (C. opilio). The mortality rates for the three species of crabs encountering different components of bottom trawls (e.g. sweeps, wings and central footrope) were estimated by capturing crabs behind the trawl and observing immediate and delayed mortalities. Mortality estimates were derived by combining condition assessments based on reflex impairments with the delayed mortality rates of retained animals. Efficiencies in evaluating delayed mortalities were achieved through assessing a suite of reflexes which proved to be predictive of subsequent mortalities (Reflex Action Mortality Predictor, RAMP). Estimated mortality rates varied by species and by the component of the trawl encountered. As important as providing the first estimates of unobserved trawl mortality rates for these crabs, this study also identifies modifications to trawl groundgear that substantially reduced crab mortalities for all three species by increasing seafloor clearance under groundgear.
completed
Towler, Rick
rick.towler@noaa.gov
pointOfContact
Towler, Rick
rick.towler@noaa.gov
custodian
asNeeded
DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center, National Marine Fisheries Service, NOAA, U.S. Department of Commerce
dataCentre
Global Change Master Directory (GCMD) Data Center Keywords
2017-04-24
publication
8.5
AFSC/RACE/MACE: Reducing Trawl impacts to benthic habitat and invertebrates
project
InPort
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Cite As: Alaska Fisheries Science Center, [Date of Access]: NPRB711 Quantification of unobserved injury and mortality of Bering Sea crabs due to encounters with trawls on the seafloor [Data Date Range], https://www.fisheries.noaa.gov/inport/item/28427.
NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
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Access Constraints: "FISMA Controls are in place to protect stored data from unauthorized access and/or disclosure"
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NOAA Data Management Plan (DMP)
NOAA/NMFS/EDM
28427
https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/afsc/dmp/pdf/28427.pdf
WWW:LINK-1.0-http--link
NOAA Data Management Plan (DMP)
NOAA Data Management Plan for this record on InPort.
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crossReference
eng; US
oceans
Bering Sea: http://www.marineregions.org/gazetteer.php?p=details&id=4310
2007
2010
Alaska Fisheries Science Center
(206) 526-4000
(206) 526-4004
7600 Sand Point Way N.E., Building 4
Seattle
WA
98115
afsc.webmaster@noaa.gov
https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center
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Alaska Fisheries Science Center Website
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http://projects.nprb.org/#metadata/d3d4915c-786d-42d0-9fcf-ffef4a24c708/project
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http://projects.nprb.org/#metadata/d3d4915c-786d-42d0-9fcf-ffef4a24c708/project
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dataset
Video and physical samples were viewed and assessed for degree of trawl interactions with benthos.