gov.noaa.nmfs.inport:28427 eng UTF8 dataset Alaska Fisheries Science Center 7600 Sand Point Way N.E., Building 4 Seattle WA 98115 USA https://www.afsc.noaa.gov WWW:LINK-1.0-http--link Website Website for this organization information 0700-1700 Pacific Time resourceProvider McCarthy, Abigail abigail.mccarthy@noaa.gov pointOfContact 2026-03-04T19:17:17 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 Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information documentDigital 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 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian AFSC/RACE/MACE: Reducing Trawl impacts to benthic habitat and invertebrates project InPort otherRestrictions 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. otherRestrictions Access Constraints: "FISMA Controls are in place to protect stored data from unauthorized access and/or disclosure" unclassified 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. information 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 USA afsc.webmaster@noaa.gov https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center WWW:LINK-1.0-http--link Alaska Fisheries Science Center Website AKFSC Home Page information 0700-1700 Pacific Time distributor http://projects.nprb.org/#metadata/d3d4915c-786d-42d0-9fcf-ffef4a24c708/project WWW:LINK-1.0-http--link http://projects.nprb.org/#metadata/d3d4915c-786d-42d0-9fcf-ffef4a24c708/project download dataset Video and physical samples were viewed and assessed for degree of trawl interactions with benthos.