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    Full Name
    Sous-groupe sur les méthodes d'évaluation acoustique et d'analyse
    Bergen, Norvège
    Date/heure de début de réunion:
    Date/heure de fin de réunion:
    Dates limites de soumission
    mardi 3 avril 2012 à 00:00 Australie/Hobart (Document de groupe de travail)
    Rapport de la réunion:
    f-sc-xxxi-a04.pdf (449.33 Ko)


      Numéro du document Titre Point(s) de l'ordre du jour
      Plus d'infos
      Draft Agenda
      Plus d'infos
      List of participants
      Plus d'infos
      List of documents
      Plus d'infos
      Semi-empirical acoustic estimates of krill biomass derived from simulated commercial fishery data based on single-frequency acoustics
      A.M. Cossio, G.W. Watters, C.S. Reiss, J. Hinke and D. Kinzey (USA)
      Plus d'infos
      Estimating Antarctic krill density from multi-beam observations using distance sampling methods
      M.J. Cox (Australia)
      2.2.1, 2.5.3
      SG-ASAM-12/06 Rev. 1
      Plus d'infos
      Information provided by Members on acoustic equipment on krill fishing vessels
      Plus d'infos
      List of participants - Subgroup on Acoustic Survey and Analysis Methods (SG-ASAM) (Bergen, Norway, 17 to 20 April 2012)
      Plus d'infos
      List of documents - Subgroup on Acoustic Survey and Analysis Methods (SG-ASAM) (Bergen, Norway, 17 to 20 April 2012)

      Ordre du jour

      Développer Commentaires | Développer Document | Réduire

      1     Introduction
      1.2     Meeting terms of reference and adoption of the agenda
      2     The scientific use of acoustic data collected on fishing vessels
      2.1     Possible objectives for fishing vessel acoustic data

      Well-defined research objectives (e.g. estimation of biomass in a pre-defined region) are required prior to designing surveys and defining data collection requirements. The intention at this point is to scope the likely range of research objectives that CCAMLR would wish to address using fishing vessel acoustic data. These research objectives can then be used to constrain the following discussions on survey design, data collection and analysis.

      A template for possible research objectives for krill fishing vessel acoustic data collection is provided in Annex 1 and will be used as a basis for discussion of objectives prior to and during the meeting.

      2.2     Survey design
      2.2.1     Practical survey designs for fishing vessel acoustics

      Given the range of research objectives from 2.1, we look at what can be achieved with differing levels of survey effort, ranging from scientific survey designs to just collection of acoustic data as part of the normal commercial fishing operations. One output should be a table showing what objectives can be achieved with differing levels of survey design and effort. This should incorporate a discussion of implications of incorporating repeat transects (including those from previous surveys).

      2.3     Acoustic data collection
      2.3.1     Instrumentation requirements

      Echo sounder requirements for different research objectives.

      2.3.2     Ancillary data requirements

      Consideration of other data, including ship’s motion, course, heading, speed, any meteorological and oceanographic data and relevant meta-data.

      2.3.3     Vessel requirements

      Brief consideration of effects of vessel design, noise and acoustic interference on acoustic data collection.

      2.3.4     Data collection protocols     Minimum requirements and protocols for collection for krill data

      Define minimum requirements for acoustic data collection that could provide quantifiable estimates of krill biomass/distribution, recognising that fishing vessels may not be configured to collect acoustic data at 38, 120 and 200 kHz as per the CCAMLR protocol. Should include whether data are to be collected by scientists/observers (supervised) or vessel crew (unsupervised). Where data are to be collected in an unsupervised manner, SG-ASAM has been requested to provide a detailed set of instructions to ensure that acoustic data are properly collected and stored.     Requirements for collection of data on pelagic species other than krill
      2.4     Collection of biological and other non-acoustic data required for acoustic interpretation and target identification

      What biological and other non-acoustic data (e.g. CPUE, data from fished aggregations etc.) are required to interpret the acoustic data? To what extent must biological data be collected during the survey periods as opposed to that collected during commercial fishing? Are data to be collected in a supervised or unsupervised manner?

      2.5     Acoustic data processing
      2.5.1     Calibration

      Requirements for obtaining a calibrated output

      2.5.2     Target identification

      Discussion and recommendation of appropriate target identification methods and processing relevant to equipment and protocols for fishing vessels acoustic data.

      2.5.3     Biomass estimation and associated uncertainty
      2.5.4     Data management and formats

      Advice on most appropriate data formats and data management implications of collection of acoustic data and associated ancillary and biological data.

      2.6     Recommended objectives for fishing vessel acoustic data

      Here we summarise our preferred combinations of objective, survey design, protocol and analysis. Should there be a single recommended protocol for all participants or do we chose several different scenarios with differing levels of survey effort? Also explore the concept of ‘cooperative surveys’ where survey effort is coordinated between vessels.

      3     Recent work on acoustics relevant to CCAMLR
      3.1     Target strength modelling

      Opportunity to discuss any recent developments either as tabled papers or communication from participants.

      3.2     Equipment developments

      Opportunity to discuss any recent developments either as tabled papers or communication from participants.

      4     Recommendations to the Scientific Committee

      These will be taken from the body of the report to address issues raised in SC-CAMLR-XXX, Annex 4, paragraph 2.225, plus any additional relevant issues (paragraph 2.226)

      5     Adoption of report
      6     Close of meeting