31133
Integrated Krill Model WG-SAM-14/20
Integrated Krill Model WG-SAM-14/20
Data Set
Published / External
31076
AMLR Krill Models
Project
Completed
1981
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.
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
ADMB
Theme
AMLR
Theme
CCAMLR
Theme
IKMT
Theme
MOCNESS
Theme
RMT8
Theme
acoustics
Theme
bathymetry
Theme
benthic
Theme
bioacoustic
Theme
biomass
Theme
ecosystem
Theme
hydroacoustic
Theme
krill
Theme
marine
Theme
population
Theme
surveys
Theme
trawl
Theme
weather
Spatial
Admiralty Bay
Spatial
Antarctic
Spatial
Antarctica
Spatial
Bransfield Strait
Spatial
Cape Shirreff
Spatial
Chile
Spatial
Clarence Island
Spatial
Copacabana
Spatial
Deception Island
Spatial
Drake Passage
Spatial
Elephant Island
Spatial
King George Island
Spatial
Livingston Island
Spatial
Peninsula
Spatial
San Telmo Islands
Spatial
Seal Island
Spatial
South Shetlands
Southwest Fisheries Science Center
La Jolla
CA
USA
Data Set
Mixed
models, code, data
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.
US Antarctic Marine Living Resources Program, NOAA
multi-frequency and multi-beam echosounders (Simrad)
various fishing and research vessels
MOCNESS, IKMT, RMT8
Data Steward
2019
Person
Woodman, Sam
sam.woodman@noaa.gov
8901 La Jolla Shores Dr
La Jolla
CA
92037
USA
858-546-7138
Distributor
2019
Organization
Southwest Fisheries Science Center
SWFSC
8901 La Jolla Shores Dr.
La Jolla
CA
92037
USA
(858)546-7000
http://swfsc.noaa.gov/
8:00-16:30
Metadata Contact
2019
Person
Kinzey, Doug
doug.kinzey@noaa.gov
8901 La Jolla Shores Dr
La Jolla
CA
92037
USA
858-546-5601
Point of Contact
2019
Person
Kinzey, Doug
doug.kinzey@noaa.gov
8901 La Jolla Shores Dr
La Jolla
CA
92037
USA
858-546-5601
-64
-43
-58
-65
FAO Area 48.1, CCAMLR Area 48.1, Antarctic Peninsula, South Shetland Islands, South Orkney Islands
Range
1981
2014
Unclassified
Available upon request; response time varies based on data management resources available at the time of the request.
Contact AMLR Point of Contact if further guidance is needed.
None
None
None
None
2019
Organization
Southwest Fisheries Science Center
Integrated Krill Model WG-SAM-14/20
Zip
Zip
https://www.fisheries.noaa.gov/about/antarctic-ecosystem-research-division-southwest-fisheries-science-center
US AMLR Stock Assessments
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.
Echosounders are calibrated to industry standards.
Industry standards are applied.
No
Unknown
No
No
Two years
NCEI-CO
Two years
Data are stored on a server at the Southwest Fisheries Science Center which has all appropriate access controls.
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.
Simrad EM3000
ac77b0a7-7efd-4f26-9a25-d2aaca06c9ba
instrument
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.
MOCNESS
gear
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.
Isaac-Kidd Midwater Trawl (IKMT)
gear
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
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.
Simrad EM3000
ac77b0a7-7efd-4f26-9a25-d2aaca06c9ba
instrument
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.
MOCNESS
gear
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.
Isaac-Kidd Midwater Trawl (IKMT)
gear
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
57162
Entity
Integrated Krill Model WG-SAM-14/20 Data
gov.noaa.nmfs.inport:31133
Stephanie Sexton
2016-03-10T12:54:34
SysAdmin InPortAdmin
2023-08-15T17:09:51
2017-03-08
Southwest Fisheries Science Center
SWFSC
8901 La Jolla Shores Dr.
La Jolla
CA
92037
USA
(858)546-7000
http://swfsc.noaa.gov/
8:00-16:30
1001
Public
No
2017-03-08
1 Year
2018-03-08