Short Citation:
Southwest Fisheries Science Center, 2021: Integrated Krill Model WG-SAM-14/20,

Item Identification

Title: Integrated Krill Model WG-SAM-14/20
Short Name: Integrated Krill Model WG-SAM-14/20
Status: Completed
Creation Date: 1981
Publication Date: 2014

The integrated modeling framework for Antarctic krill (Euphausia superba) has been extended to include estimates of krill growth consistent with survey data and to use multi-nation survey data collected from 1981 to 2014 near the Antarctic Peninsula. Four models of the population dynamics of Antarctic krill in Subarea 48.1 based on different aggregations of the data are described to illustrate the capabilities of the framework.


The eventual goal of this work is in support of CCAMLR to establish that all allowable fisheries removals for each fished stock are sustainable. AMLR scientists participate in the development of new assessment frameworks that can incorporate additional ecosystem and food web considerations and data into the formal models used to establish catch limits.

Other Citation Details:

This analyses conducted are described in the CCAMLR Working Group paper WG-SAM-14/20. This paper is made available as part of the dataset and fully describes the methods, data and results.


Theme Keywords

Thesaurus Keyword
None acoustics
None bathymetry
None benthic
None bioacoustic
None biomass
None ecosystem
None hydroacoustic
None krill
None marine
None population
None RMT8
None surveys
None trawl
None weather

Spatial Keywords

Thesaurus Keyword
None Admiralty Bay
None Antarctic
None Antarctica
None Bransfield Strait
None Cape Shirreff
None Chile
None Clarence Island
None Copacabana
None Deception Island
None Drake Passage
None Elephant Island
None King George Island
None Livingston Island
None Peninsula
None San Telmo Islands
None Seal Island
None South Shetlands

Physical Location

Organization: Southwest Fisheries Science Center
City: La Jolla
State/Province: CA
Country: USA

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Mixed
Data Presentation Form: models, code, data
Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the National Marine Fisheries Service, US AMLR or its partners.

Data Set Credit: US Antarctic Marine Living Resources Program, NOAA

Support Roles

Data Steward

CC ID: 864204
Date Effective From: 2019
Date Effective To:
Contact (Person): Woodman, Sam
Address: 8901 La Jolla Shores Dr
La Jolla, CA 92037
Email Address:
Phone: 858-546-7138


CC ID: 864205
Date Effective From: 2019
Date Effective To:
Contact (Organization): Southwest Fisheries Science Center (SWFSC)
Address: 8901 La Jolla Shores Dr.
La Jolla, CA 92037
Phone: (858)546-7000
Business Hours: 8:00-16:30

Metadata Contact

CC ID: 864206
Date Effective From: 2019
Date Effective To:
Contact (Person): Kinzey, Doug
Address: 8901 La Jolla Shores Dr
La Jolla, CA 92037
Email Address:
Phone: 858-546-5601

Point of Contact

CC ID: 864207
Date Effective From: 2019
Date Effective To:
Contact (Person): Kinzey, Doug
Address: 8901 La Jolla Shores Dr
La Jolla, CA 92037
Email Address:
Phone: 858-546-5601


Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 302388
W° Bound: -64
E° Bound: -43
N° Bound: -58
S° Bound: -65

FAO Area 48.1, CCAMLR Area 48.1, Antarctic Peninsula, South Shetland Islands, South Orkney Islands

Extent Group 1 / Time Frame 1

CC ID: 302389
Time Frame Type: Range
Start: 1981
End: 2014

Access Information

Security Class: Unclassified
Data Access Policy:

Available upon request; response time varies based on data management resources available at the time of the request. Current version of the dataset is publicly available at

Data Access Procedure:

Contact AMLR Point of Contact if further guidance is needed.

Data Access Constraints:


Data Use Constraints:


Metadata Access Constraints:


Metadata Use Constraints:


Distribution Information

Distribution 1

CC ID: 302553
Download URL:
Distributor: Southwest Fisheries Science Center (SWFSC) (2019 - Present)
File Name: Integrated Krill Model WG-SAM-14/20
File Type: Zip



CC ID: 302548
Name: US AMLR Stock Assessments
URL Type:
Online Resource

Stock assessments to estimate the status and productivity of biological populations are a central tool in the management of the harvesting of living resources. These methods are used to determine sustainable catch levels that can be demonstrated to meet long-term management criteria.

Data Quality


Echosounders are calibrated to industry standards.

Quality Control Procedures Employed:

Industry standards are applied.

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: Two years
Actual or Planned Long-Term Data Archive Location: NCEI-CO
Approximate Delay Between Data Collection and Archiving: Two years
How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?:

Data are stored on a server at the Southwest Fisheries Science Center which has all appropriate access controls.


Lineage Statement:

Raw acoustic data are collected from calibrated echosounders and archived on the vessel and later on shore-based servers. Samples from nets are processed on board the vessel, and descriptive information is entered into data logs and/or databases. All datasets are ultimately returned to the SWFSC for QA/QC, archiving and review.

Acquisition Information


Instrument 1

CC ID: 867118
Identifier: Isaac-Kidd Midwater Trawl (IKMT)
Instrument / Gear: Gear
Instrument Type: Trawl Nets

The Isaacs-Kidd Midwater Trawl (IKMT) is used to collect deep water biological specimens larger than those taken by standard plankton nets. The mouth of the net is attached to a wide, V-shaped, rigid diving vane that keeps the mouth of the net open and maintains the net at depth for extended periods

Instrument 2

CC ID: 867117
Identifier: MOCNESS
Instrument / Gear: Gear
Instrument Type: Plankton Nets

The Multiple Opening/Closing Net and Environmental Sensing System (MOCNESS) uses a stepping motor to sequentially control the opening and closing of individual nets to obtain discrete depth tow data. The MOCNESS uses underwater and shipboard electronics for controlling the device. The electronics system continuously monitors the functioning of the nets, frame angle, horizontal velocity, vertical velocity, volume filtered, and selected environmental parameters such as salinity and temperature.

Instrument 3

CC ID: 867116
Identifier: Simrad EM3000
Docucomp UUID: ac77b0a7-7efd-4f26-9a25-d2aaca06c9ba
Instrument / Gear: Instrument
Instrument Type: Multibeam Echosounder

The EM 3000 multibeam echo sounder is a very high resolution seabed mapping and inspection system with respect to high accuracy and resolution. The minimum operating depth is from less than 1 m below its transducers, and in typical sea water conditions the system operates to more than 150 m depth (less in warm water and more in fresh water). Small dimensions and low weight makes the system portable and easy to install. This allows use on survey launches and subsea vehicles to 1500 m water depth. The EM 3000 system has a very high ping rate of up to 40 Hz, a large number of measurements per ping (typically about 120), 1.5 degrees beamwidth, and electronic pitch stabilization of the transmit beam. 100% coverage of the bottom is achievable at vessel speeds of about 10 knots in shallow waters with acrosstrack coverage of up to four times depth beneath the transducers with a basic system. At longer range the achievable coverage may be up to 200 m, and 100% coverage is achievable with vessel speeds up to 20 knots. The EM 3000 may be configured to use two sets of transducers (Sonar Heads). This increases the shallow water coverage to up to ten times the depth, and the number of measurements per ping to typically 220. With an angular coverage sector of nominally 200 degrees the dual system also allows surveying to the water surface along shorelines, river banks and man-made structures. The system sonar frequency is 300 kHz allowing small dimensions, good range capability and high tolerance to turbid waters. Integrated seabed acoustical imaging capability (like a sidescan sonar) is included as standard. A nearfield mode is available for increased resolution at very short ranges (less than 4 m). A combination of phase and amplitude bottom detection algorithm is used, resulting in a measurement accuracy of 5 cm RMS being achievable practically independent of beam pointing angle. The EM 3000 multibeam system was in production from 1996 to 2004 and was replaced with the EM 3002.


Platform 1

CC ID: 867119
Identifier: Charter vessels-small boats

various vessels ranging in size (20-40 ft length) chartered for cetacean surveys when a NOAA small boat is not available.

Mounted Instrument 1

Identifier: Isaac-Kidd Midwater Trawl (IKMT)

Mounted Instrument 2

Identifier: MOCNESS

Mounted Instrument 3

Identifier: Simrad EM3000

Catalog Details

Catalog Item ID: 31133
Metadata Record Created By: Stephanie Sexton
Metadata Record Created: 2016-03-10 12:54+0000
Metadata Record Last Modified By: Sam Woodman
Metadata Record Last Modified: 2020-12-05 01:25+0000
Metadata Record Published: 2017-03-08
Owner Org: SWFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2018-03-09