SG-ASAM-16

This paper is intended to provide a generalised example of a procedure for krill density estimation, based on a worked example from the Balleny Islands (WG-EMM-15/17).  Explicitly, this paper is not the CCAMLR krill density estimation procedure, but has been written as a discussion document for the 2016 SG-ASAM meeting.

The original calculation of B₀ arising from the CCAMLR-2000 survey was undertaken at the B₀ workshop held in La Jolla, USA, in May 2000 (SC-CAMLR-XIX, Annex 4, Appendix G).

A number of changes in assessing krill target strength (TS) and identifying acoustic targets have been introduced via both CCAMLR WG-EMM papers (e.g. Demer et al. 2007) and Read More
Soumis par:
Sophie Fielding

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In 2010, CCAMLR tasked the Subgroup on Acoustic Survey and Analysis Methods (SG-ASAM) to recalculate the catch limit for Antarctic krill in the Scotia Sea based on updated acoustic algorithms developed since the first calculation in 2000. Subsequent to the 2010 SG-ASAM, code used to obtain biomass (B₀; tonnes) estimates was compiled and provided to the Secretariat for Read More
Soumis par:
Anthony Cossio

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Raw and calibrated NASC from repeat acoustic transects sampled by commercial fishing vessels is one approach to collecting data to inform within season feedback management schemes. However, a lack of sufficient data exists from which to examine its efficacy. In addition to the time/monetary commitment by fishing nations to collect such data, a time series of data, like that collected by the U. Read More
Soumis par:
Christian Reiss

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