An update of the catchability calibration factor between the Africana with the old and the new gear, with an attempt to estimate its length-dependence
Working Paper
2013
Permanent link to this Item
Authors
Journal Title
Link to Journal
Journal ISSN
Volume Title
Publisher
University of Cape Town
Publisher
University of Cape Town
Faculty
License
Series
Abstract
The 2004 analysis providing a catchability ratio for the Africana with the
new compared to the old gear is refined and extended given additional
data. The results of 1.18 (SE 0.10) for this ratio for M. paradoxus and 0.72
(SE 0.05) for M. capensis are both somewhat higher than obtained
previously, primarily as a result of the additional data now available. An
attempt is made at estimating the length dependence of these calibration
factors, but the data are found to have insufficient information content to
justify this.
Description
Reference:
Rademeyer, R. A., & Butterworth, D. S. (2013). An update of the catchability calibration factor between the Africana with the old and the new gear, with an attempt to estimate its length-dependence. MARAM: University of Cape Town.