SG-ASAM-18

Three surveys of acoustic data from around South Georgia, collected using a four frequency echosounder (38, 70, 120 and 200 kHz), were used to characterise Antarctic krill. Identification of krill targets was carried out using different permutations of two and three-frequency windows. Density was estimated, from identified krill targets, using the 120 kHz data and an acoustic scattering model Read More
Soumis par:
Sophie Fielding

Approuvé par:
Kylie Bamford (Royaume-Uni)

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Japanese multidisciplinary survey with a focus on biomass estimation of Antarctic krill will be conducted in CCAMLR Division 58.4.1 during 2018/19. The biomass estimation will be conducted according to the up-to-date CCAMLR standard protocol. The first standardized survey was conducted by CCAMLR in 2000 as the CCAMLR-2000 survey. Quantitative echosounders has evolved since then and a current Read More
Soumis par:
Koki Abe

Approuvé par:
Taro Ichii

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A dedicated krill survey for CCAMLR Division 58.4.1 during 2018/19 season will be conducted by Japanese research vessel, Kaiyo-maru. No krill biomass has been estimated in the Division since Australia carried out BROKE in 1996. There are two main objectives of our survey: (1) estimation of krill biomass to update B(0) in the area and (2) oceanographic observations in the area to detect long Read More
Soumis par:
Hiroto Murase (Japon)

Approuvé par:
Taro Ichii

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The one nautical mile integrated Nautical Area Scattering Coefficient (NASC) values of four surveys in 48.1 fishing area were calculated using both the swarm-based and conventional grid-based acoustic data processing methods. All parameter settings were consistent with the reports of SG-ASAM-2017 except that the dB difference window of Sv_{120 kHz}-Sv_38kHz is set 0 to 20 dB Read More
Soumis par:
Xiaotao Yu (Chine)

Approuvé par:
Xianyong Zhao (Chine)

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To investigate the utility of broadband sound for Antarctic krill acoustic surveys, we will conduct echo sampling with a scientific broadband echosounder EK80 (Simrad-Kongsberg) during a dedicated krill survey for CCAMLR Division 58.4.1 during 2018/19 season by Japanese research vessel, Kaiyo-maru. The echo sampling will be performed during targeted RMT1+8 tows. Spectra of volume Read More
Soumis par:
Kazuo AMAKASU (Japon)

Approuvé par:
Taro Ichii

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The performance of echo sounder system is critical for using acoustic data collected from fishing vessel to estimate Antarctic krill biomass. Acoustic data from three surveys (2015, 2016 and 2018) collected at a relatively fixed location with bottom depth around 200 m were used to evaluate the potential to use seabed backscattering as an alternative way to the standard sphere calibration. The Read More
Soumis par:
Xinliang Wang

Approuvé par:
Xianyong Zhao (Chine)

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The objective for the Multinational Large-Scale Krill Synoptic Survey in CCAMLR area 48 in 2019 is to provide an updated estimate of the biomass of Antarctic krill (Euphausia superba) used in models to estimate sustainable yield. The planned survey follows, as close as possible, the design of the CCAMLR 2000 survey, that was undertaken in the year 2000. The basis for comparisons will Read More
Soumis par:
Bjørn Krafft (Norvège)

Approuvé par:
Odd Aksel Bergstad (Norvège)

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The distribution and abundance of krill aggregation inhabiting the Subarea 48.1, which includes the Elephant Island peripheries and the west and south of the South Shetland Island, were estimated using an acoustics survey. Acoustic data were collected with 38 and 120 kHz from April 13 to 24 in 2016 and 38 and 200 kHz from March 6 to 14 and 38 and 120 kHz on April 27 and May 5 in 2017. Krill Read More
Soumis par:
Sangdeok Chung (Corée, Rép. de)

Approuvé par:
Seok-Gwan Choi (Corée, Rép. de)

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Hydroacoustic data were collected to study the distribution and abundance of Antarctic krill relative to their predators in the Southern Ocean during annual logistic summer trips and dedicated research winter trips to Antarctica on board the South African RV SA Agulhas II. The 38, 120 and 200 kHz transducers mounted on the drop keel of the research vessel were used to collect acoustic Read More
Soumis par:
Sobahle Somhlaba

Approuvé par:
Johan de Goede

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