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Summary
Item Identification
Physical Location
Data Set Info
Support Roles
Extents
Access Info
Distribution Info
Data Quality
Data Management
Lineage
Catalog Details

Summary

Short Citation
Alaska Fisheries Science Center, 2024: NPRB711 Quantification of unobserved injury and mortality of Bering Sea crabs due to encounters with trawls on the seafloor, https://www.fisheries.noaa.gov/inport/item/28427.
Full Citation Examples

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.

Distribution Information

Access Constraints:

"FISMA Controls are in place to protect stored data from unauthorized access and/or disclosure"

Child Items

No Child Items for this record.

Contact Information

Point of Contact
Rick Towler
rick.towler@noaa.gov

Metadata Contact
Abigail McCarthy
abigail.mccarthy@noaa.gov

Extents

Geographic Area 1

Bering Sea: http://www.marineregions.org/gazetteer.php?p=details&id=4310

Time Frame 1
2007 - 2010

Item Identification

Title: NPRB711 Quantification of unobserved injury and mortality of Bering Sea crabs due to encounters with trawls on the seafloor
Short Name: NPRB711 Quantification of unobserved injury and mortality of Bering Sea crabs
Status: Completed
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.

Physical Location

Organization: Alaska Fisheries Science Center
City: Seattle
State/Province: WA
Country: USA

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Data Presentation Form: Document (digital)

Support Roles

Data Steward

CC ID: 241707
Date Effective From: 2015-10-29
Date Effective To:
Contact (Person): Towler, Rick
Email Address: rick.towler@noaa.gov

Distributor

CC ID: 241705
Date Effective From: 2015-10-29
Date Effective To:
Contact (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
URL: https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center
Business Hours: 0700-1700 Pacific Time

Metadata Contact

CC ID: 241706
Date Effective From: 2015-10-29
Date Effective To:
Contact (Person): McCarthy, Abigail
Email Address: abigail.mccarthy@noaa.gov

Point of Contact

CC ID: 241704
Date Effective From: 2015-10-29
Date Effective To:
Contact (Person): Towler, Rick
Email Address: rick.towler@noaa.gov

Extents

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 241708
Description

Bering Sea: http://www.marineregions.org/gazetteer.php?p=details&id=4310

Extent Group 1 / Time Frame 1

CC ID: 241709
Time Frame Type: Range
Start: 2007
End: 2010

Access Information

Security Class: Unclassified
Data Access Procedure:

Go to http://projects.nprb.org/#metadata/d3d4915c-786d-42d0-9fcf-ffef4a24c708/project or email rick.towler@noaa.gov

Data Access Constraints:

"FISMA Controls are in place to protect stored data from unauthorized access and/or disclosure"

Distribution Information

Distribution 1

CC ID: 269997
Download URL: http://projects.nprb.org/#metadata/d3d4915c-786d-42d0-9fcf-ffef4a24c708/project
Distributor:

Data Quality

Quality Control Procedures Employed:

The data were reviewed for completeness and accuracy after shipboard collection protocols.

Data Management

Have Resources for Management of these Data Been Identified?: No
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
Approximate Delay Between Data Collection and Dissemination: 365
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

Lineage Statement:

Video and physical samples were viewed and assessed for degree of trawl interactions with benthos.

Catalog Details

Catalog Item ID: 28427
GUID: gov.noaa.nmfs.inport:28427
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 Last Review Date: 2016-05-18
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2017-05-18