WG-ASAM-2023 | Meetings

Working Group on Acoustic Survey and Analysis Methods

Location:

Tokyo, Japan

Meeting Start Date/Time:

Monday, 22 May 2023

Meeting End Date/Time:

Friday, 26 May 2023

Submissions Due

Monday, 8 May 2023 - 09:00 Australia/Hobart (Working Group Paper)

Please note that information for delegates in now available.

Meeting Report:

e-sc-42-a4.pdf (1.18 MB)

Meeting Documents

Documents

Document Number	Title	Agenda Item(s)
WG-ASAM-2023/01 More Info	Standardised rules for georeferenced polygons and lines CCAMLR Secretariat Abstract: In support of ongoing improvements of geospatial operations at the Secretariat, this document presents an update to the approach introduced in document WG-ASAM-2022/02. The intent is to set agreed rules to ensure a standardized approach to the generation of georeferenced objects (e.g. strata polygons) for use in CCAMLR activities. Here, while introducing Read More Submitted By: Dr Stephane Thanassekos (CCAMLR Secretariat) Approved By: Dr David Agnew (CCAMLR Secretariat) Request Meeting Document	3
WG-ASAM-2023/02 More Info	Using automatic open-source analysis of backscatter data from fishing vessels to implement feedback management of the Antarctic krill fishery S. Menze, G.J. Macaulay, G. Zhang, A. Lowther and B.A. Krafft Abstract: The implementation of a feedback management system for a sustainable Antarctic krill fishery is challenged by a lack of krill abundance data. Here we present the Krillscan python package to automatically process and share echosounder data from both scientific surveys and fishing operations. This enables an accelerated, transparent, and reproducible analysis of krill backscatter data. We tested Read More Submitted By: Dr Sebastian Menze Approved By: Dr Bjørn Krafft (Norway) Request Meeting Document	4.2
WG-ASAM-2023/03 More Info	Preliminary results of a local acoustic-trawl survey of Champsocephalus gunnari in Statistical Subarea 48.2 L. Pshenichnov, V. Podhornyi and K. Demianenko Abstract: In the February 2023 Ukrainian fishing vessel "MORE SODRUZHESTVA" has conducted a local acoustic-trawl survey of Champsocephalus gunnari in the statistical Subarea 48.2. Brief results of this survey are presented here. Submitted By: Dr Kostiantyn Demianenko (Ukraine) Approved By: Dr Kostiantyn Demianenko (Ukraine) Request Meeting Document	7
WG-ASAM-2023/04 More Info	Temporal patterns in South Georgia (48.3) zooplankton: insights from a moored echosounder T. Dornan, S. Fielding and G.A. Tarling Abstract: Antarctic krill (Euphausia superba) are a key species in the Southern Ocean ecosystem, supporting large populations of higher predators, contributing to the sequestration of carbon and the subject of a fishery. Here we detail the deployment and results from 4 years of moored 120 kHz EK80 echosounder data from South Georgia. These data indicate considerable Read More Submitted By: Dr Tracey Dornan (United Kingdom) Approved By: Dr Martin Collins (United Kingdom) Request Meeting Document	6
WG-ASAM-2023/05 More Info	Echosounder settings and calibration parameters for New Zealand fishing vessels, 2009–2022 A. Wieczorek, Y. Ladroit, P. Escobar-Flores, R O’Driscoll and J. Devine Abstract: At WG-SAM-2022, the Working Group requested further documentation on the acoustic instruments used and the aim of the acoustic component of the Ross Sea shelf survey and suggested presenting the acoustic monitoring plan at WG-ASAM-2023. This paper presents information on acoustic instruments and echosounder settings used by the three New Zealand fishing vessels Read More Submitted By: Mr Nathan Walker (New Zealand) Approved By: Mr Nathan Walker (New Zealand) Request Meeting Document	4.1
WG-ASAM-2023/06 More Info	Acoustic determination of Antarctic krill biomass at South Georgia (Subarea 48.3) during winter C.M. Liszka, S. Fielding, T. Dornan and M.A. Collins Abstract: During the austral winter of 2022, three acoustic surveys were carried out to estimate the biomass and distribution of Euphausia superba (Antarctic krill) on the northern shelf of South Georgia. Surveys were undertaken in May, July and September 2022, corresponding with the start, middle and end of the krill fishing season, carried out on board the MV Pharos SG Read More Submitted By: Dr Martin Collins (United Kingdom) Approved By: Dr Martin Collins (United Kingdom) Request Meeting Document	5.1, 4.3
WG-ASAM-2023/07 More Info	Some parameters for consideration regarding improvement of the CCAMLR protocol for calculating krill biomass G. Zhang, G. Skaret, R. Pedersen, S. Menze and B.A. Krafft Abstract: CCAMLRs protocol for calculating krill biomass contains recommendations for procedures to process data collected from acoustic surveys. For instance, only the data collected within the limit of 250 m of the water column are to be included in the calculations. This depth limit was decided assuming that most krill are distributed shallower than this, and Read More Submitted By: Dr Guosong Zhang (Norway) Approved By: Dr Bjørn Krafft (Norway) Request Meeting Document	3
WG-ASAM-2023/08 More Info	Calibration of echosounders for biomass estimation using seafloor backscattering at fixed transects G. Macaulay, S. Menze and B. Krafft Abstract: Backscatter from metallic spheres is the conventional reference for calibrating the amplitude response of echosounders when used for scientific acoustic biomass estimation. However, these can be time consuming to do, requiring specialized equipment and expertise. A simpler method is desirable when the expertise, equipment, conditions, and time are not available. This work Read More Submitted By: Dr Gavin Macaulay Approved By: Dr Bjørn Krafft (Norway) Request Meeting Document	4.1
WG-ASAM-2023/09 More Info	Repository of acoustic data collected by fishing vessels along CCAMLR nominated transects CCAMLR Secretariat Abstract: This paper presents recent developments on the CCAMLR Acoustic Data Repository to firstly provide an overview of raw acoustics data submitted since WG-ASAM-2022 and then outline the data exploration tool created for these data as requested by WG-ASAM-2022. The paper also proposes modifications to the ‘Instruction manual for the collection of fishing-vessel- Read More Submitted By: Mr Daphnis De Pooter (CCAMLR Secretariat) Approved By: Dr David Agnew (CCAMLR Secretariat) Request Meeting Document	4.2, 3.2
WG-ASAM-2023/10 More Info	Some corrections to Table 2 of WG-ASAM-2021/06 (Abe et al., 2021) K. Abe, R. Matsukura, N. Yamamoto, K. Amakasu, R. Nagata and H. Murase Submitted By: Dr Koki Abe (Japan) Approved By: Dr Takehiro Okuda (Japan) Request Meeting Document	5.2
WG-ASAM-2023/P01 More Info	Two scales of distribution and biomass of Antarctic krill (Euphausia superba) in the eastern sector of the CCAMLR Division 58.4.2 (55°E to 80°E) M.J. Cox, G. Macaulay, M.J. Brasier, A. Burns, O.J. Johnson, R. King, D. Maschette, J. Melvin, A.J.R. Smith, C.K. Weldrick, S. Wotherspoon and S. Kawaguchi Abstract: Regular monitoring is an important component of the successful management of pelagic animals of interest to commercial fisheries. Here we provide a biomass estimate for Antarctic krill (Euphausia superba) in the eastern sector of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) Division 58.4.2 (55 ̊E to 80 ̊E; area = 775,732 km²) using data collected Read More Submitted By: Dr Martin Cox (Australia) Approved By: Dr Philippe Ziegler (Australia) Publication: PLOS ONE, 17(8): e0271078 (2022), doi: https://doi.org/10.1371/journal.pone.0271078 Request Meeting Document	5.2
WG-ASAM-2023/P02 More Info	Per-length biomass estimates of Antarctic krill (Euphausia superba) A.J. Smith, S. Wotherspoon and M.J. Cox Abstract: Total biomass and areal biomass density are often necessary to establish ecological relationships and enable informed management decisions, in particular setting fisheries catch limits. Further refining these estimates to sub-population biomass based on length informs ecological models of predator-prey dynamics, ecosystem energy transfer and biogeochemical cycles; however, measures of Read More Submitted By: Dr Martin Cox (Australia) Approved By: Dr Philippe Ziegler (Australia) Publication: Front. Mar. Sci., Sec. Marine Ecosystem Ecology, 10 (2023), doi: 10.3389/fmars.2023.1107567 Request Meeting Document	3
WG-ASAM-2023/P03 More Info	Volume backscattering spectra measurements of Antarctic krill using a broadband echosounder N. Yamamoto, K. Amakasu, K. Abe, R. Matsukura, T. Imaizumi, T. Matsuura and H. Murase Submitted By: Dr Kazuo Amakasu Approved By: Dr Takehiro Okuda (Japan) Publication: Fish. Sci., 89 (2023): 301–315, doi: https://doi.org/10.1007/s12562-023-01678-6 Request Meeting Document	5.2
WG-EMM-2021/05 Rev. 1 More Info	Results from the WG-ASAM intersessional e-group on Krill biomass estimates from acoustic surveys WG-ASAM e-group on Krill biomass estimates from acoustic surveys Abstract: Based on the direction of WG-ASAM during 2021, an e-group was established to develop a method to provide estimates of krill biomass for use in the GRYM and for development of a management strategy for krill. Krill biomass densities at a variety of spatial scales are presented for consideration by WG-EMM in 2021. The mean biomass density ranges from a low of 45.54 gm m^-2 for the time Read More Submitted By: Dr George Watters (United States of America) Approved By: Dr George Watters (United States of America) Request Meeting Document	5.1

Agenda

Expand All Annotations | Expand All Documents | Collapse All

1 Introduction

Documents

1.1 Opening of the meeting

Documents

1.2 Adoption of the Agenda

Documents

2 Review Terms of Reference and workplan

Annotations

The Working Group will review the Terms of Reference (See SC-CAMLR-4,1Annex 10) and the workplan set out in SC-CAMLR-41, Table 9).

Documents

3 Standardised procedures for acoustic surveys and development of krill biomass estimates

Documents

WG-ASAM-2023/01	Standardised rules for georeferenced polygons and lines CCAMLR Secretariat
WG-ASAM-2023/07	Some parameters for consideration regarding improvement of the CCAMLR protocol for calculating krill biomass G. Zhang, G. Skaret, R. Pedersen, S. Menze and B.A. Krafft
WG-ASAM-2023/P02	Per-length biomass estimates of Antarctic krill (Euphausia superba) A.J. Smith, S. Wotherspoon and M.J. Cox

3.1 Collection, processing and reporting of acoustic data

Annotations

The Working Group will review the content and quality assurance required for dedicated acoustic surveys to deliver krill biomass estimates to CCAMLR for use in management.
The Working Group will review the metadata reporting requirements developed during ASAM 2022, including the development of a data exploration tool.

Documents

3.2 Storage of acoustic data

Annotations

The Working Group will consider database and storage needs for acoustic data collected by fishing vessels and research surveys.

Documents

WG-ASAM-2023/09

Repository of acoustic data collected by fishing vessels along CCAMLR nominated transects
CCAMLR Secretariat

4 Collection and analysis of acoustic data on board fishing vessels

Documents

4.1 Methods for calibrating echosounders on fishing vessels

Annotations

The Working Group will consider methods, procedures, and reporting requirements for calibration of echosounders on fishing vessels used for acoustic data collection.

Documents

WG-ASAM-2023/05	Echosounder settings and calibration parameters for New Zealand fishing vessels, 2009–2022 A. Wieczorek, Y. Ladroit, P. Escobar-Flores, R O’Driscoll and J. Devine
WG-ASAM-2023/08	Calibration of echosounders for biomass estimation using seafloor backscattering at fixed transects G. Macaulay, S. Menze and B. Krafft

4.2 Survey design and data collection for fishing vessels

Annotations

The Working Group will review acoustic data collected along nominated transects by fishing vessels.
The Working Group will consider survey designs, data reporting requirements and data processing needs for using fishing vessels as platforms to support biomass estimation of krill, including the review of an instruction manual for collection of fishing-vessel-based acoustic data.

Documents

WG-ASAM-2023/02	Using automatic open-source analysis of backscatter data from fishing vessels to implement feedback management of the Antarctic krill fishery S. Menze, G.J. Macaulay, G. Zhang, A. Lowther and B.A. Krafft
WG-ASAM-2023/09	Repository of acoustic data collected by fishing vessels along CCAMLR nominated transects CCAMLR Secretariat

4.3 Krill biological data collection

Annotations

The Working Group will consider the data collection needs to support krill biomass estimation from fishing vessels undertaking acoustic surveys for krill, particularly krill length frequency data and weight data from scientific observers.

Documents

WG-ASAM-2023/06

Acoustic determination of Antarctic krill biomass at South Georgia (Subarea 48.3) during winter
C.M. Liszka, S. Fielding, T. Dornan and M.A. Collins

5 Krill biomass estimates

Documents

5.1 Area 48 biomass estimates

Annotations

The Working Group will discuss the methodology on the estimation of uncertainty for Subarea 48.1 stratum biomass estimates using existing data, and consider the krill biomass estimates for other subareas in Area 48.

Documents

WG-ASAM-2023/06	Acoustic determination of Antarctic krill biomass at South Georgia (Subarea 48.3) during winter C.M. Liszka, S. Fielding, T. Dornan and M.A. Collins
WG-EMM-2021/05 Rev. 1	Results from the WG-ASAM intersessional e-group on Krill biomass estimates from acoustic surveys WG-ASAM e-group on Krill biomass estimates from acoustic surveys

5.2 Area 58 biomass estimates

Annotations

The Working Group will review survey results for biomass estimates from East Antarctic surveys.

Documents

WG-ASAM-2023/10	Some corrections to Table 2 of WG-ASAM-2021/06 (Abe et al., 2021) K. Abe, R. Matsukura, N. Yamamoto, K. Amakasu, R. Nagata and H. Murase
WG-ASAM-2023/P01	Two scales of distribution and biomass of Antarctic krill (Euphausia superba) in the eastern sector of the CCAMLR Division 58.4.2 (55°E to 80°E) M.J. Cox, G. Macaulay, M.J. Brasier, A. Burns, O.J. Johnson, R. King, D. Maschette, J. Melvin, A.J.R. Smith, C.K. Weldrick, S. Wotherspoon and S. Kawaguchi
WG-ASAM-2023/P03	Volume backscattering spectra measurements of Antarctic krill using a broadband echosounder N. Yamamoto, K. Amakasu, K. Abe, R. Matsukura, T. Imaizumi, T. Matsuura and H. Murase

6 Survey design and using other platforms

Annotations

The Working Group will consider design and analysis methods to examine temporal and spatial variability of krill distribution by observations from various sources (e.g., gliders, moorings, and acoustic data collected during routine fishing activities.

Documents

WG-ASAM-2023/04

Temporal patterns in South Georgia (48.3) zooplankton: insights from a moored echosounder
T. Dornan, S. Fielding and G.A. Tarling

7 Develop methods to estimate biomass of finfish using acoustic techniques

Annotations

The Working Group will consider papers submitted regarding the design, analysis or results of biomass surveys for finfish such as mackerel icefish.

Documents

WG-ASAM-2023/03

Preliminary results of a local acoustic-trawl survey of Champsocephalus gunnari in Statistical Subarea 48.2
L. Pshenichnov, V. Podhornyi and K. Demianenko

8 Future work

Annotations

The working group will consider the workplan in SC-CAMLR-41 Table 9 and identify any reprioritisation or revision for discussion by the Scientific Committee.

Documents

9 Other business

Annotations

The Working Group will consider any other business, including acoustic survey data from research conducted under CM 24-01.

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10 Advice to the Scientific Committee

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11 Adoption of report and close of meeting.

Documents