SG-ASAM-2019 | Reuniones

Subgrupo sobre Prospecciones Acústicas y Métodos de Análisis

Lugar:

Bergen, Norway

Fecha y hora del inicio de la reunión:

lunes, 26 agosto 2019

Fecha y hora del fin de la reunión:

viernes, 30 agosto 2019

Plazo de presentación

lunes, 12 agosto, 2019 - 00:00 Australia/Hobart (Documento de grupo de trabajo)

The meeting will be held in Bergen, Norway, at the Institute of Marine Research (https://www.hi.no/en).

Informe de la reunión:

s-sc-38-a6.pdf (240.81 KB)

Documentos de reunión

Documentos

Número de documento	Nombre	Punto(s) de la agenda
SG-ASAM-2019/01 Mostrar menos información	Acoustic data collection by the krill fishing industry to improve the monitoring of krill abundance K. Reid and J. Arata Resumen: SG-ASAM are invited to consider provide further recommendations for improving this fishing vessel data collection program and provide advice on the timing and frequency for conducting acoustic transects; the methods for the data transmission to the Secretariat including the use of EchoExplore to provide a meta-data catalogue of the data and whether to have Read More Presentado por: Ms Doro Forck (Secretaría de la CCRVMA) Solicitar acceso a documento de reunión	3
SG-ASAM-2019/02 Mostrar menos información	Preliminary biomass estimation of Antarctic krill based on the swarm-based method for CCAMLR Division 58.4.1 in 2018/19 using data obtained by Japanese survey vessel Kaiyo-maru K. Abe, R. Matsukura, N. Yamamoto, K. Amakasu and H. Murase Resumen: Biomass (B₀) of Antarctic krill for CCAMLR Division 58.4.1 in 2018/19 was preliminarily estimated as 4.349 million ton (CV=54.8 %) based on the swam based method using data obtained by Kaiyo-maru. The point estimate was comparable with the estimate in 1996 by BROKE (4.83 million ton with CV=17 %). However, they can not be compared directly because (1) biomass Read More Presentado por: Dr Hiroto Murase (Japón) Aprobado por: Dr Taro Ichii Solicitar acceso a documento de reunión	2.2
SG-ASAM-2019/03 Rev. 1 Mostrar menos información	Density estimation of Antarctic krill (Euphausia superba) around South Shetland Island and Elephant Island (Subarea 48.1) using two frequencies with 38 and 120 kHz S. Choi, S. Chung, I. Han, W. Oh, D. An and K. Lee Resumen: The density of Antarctic krill swarm inhabiting the Subarea 48.1, which includes the Elephant Island peripheries and the west and north of the South Shetland Island, was estimated using an acoustics survey. Acoustic data were collected using two frequencies with 38 and 120 kHz from March 8 to 15 in 2019. Krill were collected by the commercial midwater trawl fishing vessel. The data were Read More Presentado por: Dr Sangdeok Chung (República de Corea) Aprobado por: Dr Seok-Gwan Choi (República de Corea) Solicitar acceso a documento de reunión	2.1.2
SG-ASAM-2019/04 Rev. 1 Mostrar menos información	Time series of Antarctic krill estimates around the South Shetland Islands from 2013 to 2019 X. Yu, X. Wang, X. Zhao, J. Zhang, G. Fan, Y. Ying and J. Zhu Resumen: Metadata for krill biomass time series obtained by Chinese krill fishing vessel in Subarea 48.1 is submitted with accompanying description of the acoustic survey and data analysis. Distribution of Antarctic krill for the 2013/14 to 2015/16 and the 2017/18 to 2018/19 fishing seasons were mapped by the Chinese F/V Fu Rong Hai to understand the interannual variations of Antarctic krill Read More Presentado por: Dr Xiaotao Yu (China) Aprobado por: Dr Xianyong Zhao (China) Solicitar acceso a documento de reunión	3
SG-ASAM-2019/05 Mostrar menos información	Diel vertical distribution of Antarctic krill around the South Shetland Islands in February 2019 and its potential effect on biomass estimation X. Wang, X. Yu, J. Zhang and X. Zhao Resumen: To address the potential effect of DVM behavior on krill biomass estimates, diel vertical distribution of krill swarms around the South Shetland Islands in Subarea 48.1 were analyzed based on data collected by the Chinese fishing vessel participating in the international 2019 Area 48 survey. Results show that more krill swarms were found in shallower depth at night than during daytime, while Read More Presentado por: Dr Xinliang Wang Aprobado por: Dr Xianyong Zhao (China) Solicitar acceso a documento de reunión	2, 2.1.3
SG-ASAM-2019/06 Mostrar menos información	Comparison of krill density estimated with swarm-based and dB-difference method using acoustic data collected by Chinese fishing vessel participating in the 2019 Area 48 survey X. Yu, X. Wang, J. Zhang and X. Zhao Resumen: To address the effect of various identification methods on krill biomass estimates, comparison on the swarm-based and dB-difference (Sv_120kHz-Sv_38kHz) identification method were made using the acoustic data collected around the South Shetland Islands in Subarea 48.1 by the Chinese fishing vessel F/V Fu Rong Hai during the 2019 Area 48 survey. Identification Read More Presentado por: Dr Xiaotao Yu (China) Aprobado por: Dr Xianyong Zhao (China) Solicitar acceso a documento de reunión	2.1.2
SG-ASAM-2019/07 Mostrar menos información	Biomass estimates of Antarctic krill based on survey conducted by the Chinese fishing vessel FV Fu Rong Hai during the 2019 Area 48 survey X. Wang, X. Yu, X. Zhao, J. Zhang, G. Fan, J. Zhu and Y. Ying Resumen: As a contribution to the joint effort on the large-scale international synoptic krill survey of Area 48 (2019 Area 48 survey), the Chinese krill fishing vessel F/V Fu Rong Hai conducted the acoustic survey around the South Shetland Islands and the Elephant Islands in the Subarea 48.1 from 5^th to 10^th February 2019. Implementation and preliminary results on the Read More Presentado por: Dr Xinliang Wang Aprobado por: Dr Xianyong Zhao (China) Solicitar acceso a documento de reunión	2.1
SG-ASAM-2019/08 Rev. 1 Mostrar menos información	Biomass results from the International Synoptic Krill Survey in Area 48, 2019 G. Macaulay, G. Skaret, T. Knutsen, O.A. Bergstad, B. Krafft, S. Fielding, S. Choi, S. Chung, K. Demianenko, V. Podhornyi, K. Vishnyakova, L. Pshenichnov, A. Chuklin, A. Shishman, X. Wang, X. Zhao and M. Cox Resumen: Results from the International Synoptic Krill Survey in Area 48, 2019, are presented. This survey covered both the strata occupied during the CCAMLR 2000 acoustic survey and the strata that comprise the regular AMLR survey. Acoustic transects (10534 n.mi), oceanographic measurements (253 casts), and trawls (164) were carried out as per survey procedures developed in 2018, which were based on Read More Presentado por: Dr Gavin Macaulay Aprobado por: Dr Odd Aksel Bergstad (Noruega) Solicitar acceso a documento de reunión	2.1
SG-ASAM-2019/09 Mostrar menos información	Supervised and unsupervised (RapidKrill) estimates of krill density from DY098 A. Ariza, S. Fielding and R. Blackwell Resumen: We compare supervised, using the interactive software Echoview™, and unsupervised, using python, processing of acoustic data collected during the UK cruise DY098. The same data processing procedures are applied in both methods, and we show that the unsupervised method comes up with a similar Read More Presentado por: Dr Sophie Fielding Aprobado por: Ms Doro Forck (Secretaría de la CCRVMA) Solicitar acceso a documento de reunión	3.2
SG-ASAM-2019/10 Mostrar menos información	Methodological aspects of the International Synoptic Krill Survey in Area 48, 2019 G. Macaulay, G. Skaret, T. Knutsen and B. Krafft Resumen: The effect of differences in the methodology used for the CCAMLR 2000 krill acoustic survey and the 2019 synoptic survey were considered. These were 1) the effect of acoustic surveying at night, 2) differing trawl selectivity between the vessels that participated in the survey, and 3) the effect of krill discrimination method. Surveying during the day only produced a 6% increase in the Read More Presentado por: Dr Gavin Macaulay Aprobado por: Dr Odd Aksel Bergstad (Noruega) Solicitar acceso a documento de reunión	2.1.2, 2.1.3

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Agenda

Expandir Comentarios(/Resúmenes) | Expandir Documentos | Contraer

1 Opening of the meeting

Comentarios(/Resúmenes)

The Convener will welcome participants, outline priorities for the meeting and provide an overview of local facilities including Secretariat support, Internet access and extracurricular activities.

Documentos

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2 Large-scale krill surveys conducted in 2019

Comentarios(/Resúmenes)

Including analysis of acoustic data from seabed along nominated transects, development of calibration methods with broadband acoustics etc.

Documentos

SG-ASAM-2019/05

Diel vertical distribution of Antarctic krill around the South Shetland Islands in February 2019 and its potential effect on biomass estimation
X. Wang, X. Yu, J. Zhang and X. Zhao

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2.1 Area 48 multinational survey

Documentos

SG-ASAM-2019/07	Biomass estimates of Antarctic krill based on survey conducted by the Chinese fishing vessel FV Fu Rong Hai during the 2019 Area 48 survey X. Wang, X. Yu, X. Zhao, J. Zhang, G. Fan, J. Zhu and Y. Ying
SG-ASAM-2019/08 Rev. 1	Biomass results from the International Synoptic Krill Survey in Area 48, 2019 G. Macaulay, G. Skaret, T. Knutsen, O.A. Bergstad, B. Krafft, S. Fielding, S. Choi, S. Chung, K. Demianenko, V. Podhornyi, K. Vishnyakova, L. Pshenichnov, A. Chuklin, A. Shishman, X. Wang, X. Zhao and M. Cox

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2.1.1 Cross-checking of survey results among different participants

Documentos

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2.1.2 Comparison of results using the dB window and the swarm-based methods

Documentos

SG-ASAM-2019/03 Rev. 1	Density estimation of Antarctic krill (Euphausia superba) around South Shetland Island and Elephant Island (Subarea 48.1) using two frequencies with 38 and 120 kHz S. Choi, S. Chung, I. Han, W. Oh, D. An and K. Lee
SG-ASAM-2019/06	Comparison of krill density estimated with swarm-based and dB-difference method using acoustic data collected by Chinese fishing vessel participating in the 2019 Area 48 survey X. Yu, X. Wang, J. Zhang and X. Zhao
SG-ASAM-2019/10	Methodological aspects of the International Synoptic Krill Survey in Area 48, 2019 G. Macaulay, G. Skaret, T. Knutsen and B. Krafft

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2.1.3 Revised/refined analysis, including taking into account any issues raised during WG-EMM

Documentos

SG-ASAM-2019/05	Diel vertical distribution of Antarctic krill around the South Shetland Islands in February 2019 and its potential effect on biomass estimation X. Wang, X. Yu, J. Zhang and X. Zhao
SG-ASAM-2019/10	Methodological aspects of the International Synoptic Krill Survey in Area 48, 2019 G. Macaulay, G. Skaret, T. Knutsen and B. Krafft

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2.2 Area 58 Japanese survey

Documentos

SG-ASAM-2019/02

Preliminary biomass estimation of Antarctic krill based on the swarm-based method for CCAMLR Division 58.4.1 in 2018/19 using data obtained by Japanese survey vessel Kaiyo-maru
K. Abe, R. Matsukura, N. Yamamoto, K. Amakasu and H. Murase

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2.2.1 Review of preliminary survey results, including the use of broadband acoustic data

Documentos

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3 Review of collection and analysis of krill acoustic data from fishing vessels

Comentarios(/Resúmenes)

SG-ASAM will review the methods for processing acoustic data collected on krill fishing vessels according to the swarm-based approach agreed at SG-ASAM-2017, including validations/potential improvements.

Documentos

SG-ASAM-2019/01	Acoustic data collection by the krill fishing industry to improve the monitoring of krill abundance K. Reid and J. Arata
SG-ASAM-2019/04 Rev. 1	Time series of Antarctic krill estimates around the South Shetland Islands from 2013 to 2019 X. Yu, X. Wang, X. Zhao, J. Zhang, G. Fan, Y. Ying and J. Zhu

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3.1 Progress in data collection and delivery of acoustic data from fishing vessels

Documentos

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3.2 Procedures for the collection and analysis of krill acoustic data collected on designated transects

Comentarios(/Resúmenes)

This item will include advice and recommendations arising from discussion at WG-EMM.

Documentos

SG-ASAM-2019/09

Supervised and unsupervised (RapidKrill) estimates of krill density from DY098
A. Ariza, S. Fielding and R. Blackwell

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4 Other technical aspects relevant to the krill acoustic surveys and data analysis

Comentarios(/Resúmenes)

SG-ASAM will analyse data collected by krill fishing vessels, noting any methodological changes arising from Agenda item 2, with particular emphasis on data from the nominated transects and data collection during normal fishing operations.

Documentos

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5 Other business

Comentarios(/Resúmenes)

SG-ASAM will review other relevant issues.

Documentos

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6 Advice to the Scientific Committee

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7 Adoption of the report and close of the meeting.

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