The ages of 252 mature female krill, collected from Prydz Bay in January 1985, were determined using length frequency analysis and the fluorescent age pigment (FAP) technique. Results of both methods indicate 6 year classes for adult krill. Correspondence between the ages determined by the two techniques is generally within one year.
The animals were also analyzed by a computerized image analysis system, which recorded a large suite of size and shape parameters. The accuracy of discriminant functions constructed to relate the image analysis parameters to age approached 90% for the ages defined by length frequency, and 52% for physiological age.
Abstract:
A method is proposed for estimating the biomass of swarms of Euphausia superba by catching cast off exoskeletons in quantitative net tows.
There is no abstract available for this document.
Abstract:
Hydroacoustic and net sampling data were used to determine the distribution and abundance of krill. In an attempt to address the effect that variability in sampling gear type may have on specific population parameters (e.g. size frequency, abundance and distribution), a multi-year comparison of these types of samp1ing gear commonly used in the Antarctic has been initiated.
