NPRB711 Quantification of unobserved injury and mortality of Bering Sea crabs due to encounters with trawls on the seafloor
Alaska Fisheries Science Center
Data Set
(DS)
| ID: 28427
| Published / External
Created: 2015-10-30
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Last Modified: 2024-01-15
Project (PRJ) | ID: 28424
ID: 28427
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | NPRB711 Quantification of unobserved injury and mortality of Bering Sea crabs due to encounters with trawls on the seafloor |
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Short Name | NPRB711 Quantification of unobserved injury and mortality of Bering Sea crabs |
* Status | Completed |
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* » Abstract |
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. |
* Purpose |
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. |
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• » Organization | Alaska Fisheries Science Center |
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• » City | Seattle |
• » State/Province | WA |
• Country | USA |
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* Data Set Scope Code | Data Set |
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• Maintenance Frequency | As Needed |
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» Data Presentation Form | Document (digital) |
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* » Support Role | Data Steward |
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* » Date Effective From | 2015-10-29 |
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Person | Towler, Rick |
Email Address | rick.towler@noaa.gov |
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* » Support Role | Distributor |
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* » Date Effective From | 2015-10-29 |
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Organization | Alaska Fisheries Science Center (AFSC) |
Address |
7600 Sand Point Way N.E., Building 4 Seattle, WA 98115 USA |
Email Address | afsc.webmaster@noaa.gov |
Phone | (206) 526-4000 |
Fax | (206) 526-4004 |
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URL | https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center |
Business Hours | 0700-1700 Pacific Time |
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* » Support Role | Metadata Contact |
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* » Date Effective From | 2015-10-29 |
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Person | McCarthy, Abigail |
Email Address | abigail.mccarthy@noaa.gov |
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* » Date Effective From | 2015-10-29 |
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Person | Towler, Rick |
Email Address | rick.towler@noaa.gov |
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* » Description |
Bering Sea: http://www.marineregions.org/gazetteer.php?p=details&id=4310 |
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* » Start | 2007 |
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* » Security Class | Unclassified |
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» Data Access Procedure |
Go to http://projects.nprb.org/#metadata/d3d4915c-786d-42d0-9fcf-ffef4a24c708/project or email rick.towler@noaa.gov |
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"FISMA Controls are in place to protect stored data from unauthorized access and/or disclosure" |
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» Download URL | http://projects.nprb.org/#metadata/d3d4915c-786d-42d0-9fcf-ffef4a24c708/project |
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The data were reviewed for completeness and accuracy after shipboard collection protocols. |
Data Management
» Have Resources for Management of these Data Been Identified? | No |
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» Approximate Percentage of Budget for these Data Devoted to Data Management | Unknown |
» Do these Data Comply with the Data Access Directive? | No |
» Is Access to the Data Limited Based on an Approved Waiver? | No |
» If Distributor (Data Hosting Service) is Needed, Please Indicate | |
» Approximate Delay Between Data Collection and Dissemination | 365 |
» If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed | |
» Actual or Planned Long-Term Data Archive Location | Other |
» If World Data Center or Other, Specify | http://projects.nprb.org/#metadata/d3d4915c-786d-42d0-9fcf-ffef4a24c708/project |
» Approximate Delay Between Data Collection and Archiving | 365 |
» How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive? |
"IT Security and Contingency Plan for the system establishes procedures and applies to the functions, operations, and resources necessary to recover and restore data as hosted in the Western Regional Support Center in Seattle, Washington, following a diserruption." |
Lineage
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Video and physical samples were viewed and assessed for degree of trawl interactions with benthos. |
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Catalog Details
Catalog Item ID | 28427 |
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Metadata Record Created By | Abigail McCarthy |
Metadata Record Created | 2015-10-30 15:37+0000 |
Metadata Record Last Modified By | SysAdmin InPortAdmin |
» Metadata Record Last Modified | 2024-01-15 12:08+0000 |
Metadata Record Published | 2016-05-18 |
Owner Org | AFSC |
Metadata Publication Status | Published Externally |
Do Not Publish? | N |
Metadata Workflow State | Published / External |
Metadata Last Review Date | 2016-05-18 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2017-05-18 |
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