Overall results for the effect of the presence of an observer on catches made by the pelagic fleet
Working Paper
2005
Permanent link to this Item
Authors
Journal Title
Link to Journal
Journal ISSN
Volume Title
Publisher
Publisher
University of Cape Town
Faculty
License
Series
Abstract
The analysis of the observer data for the pelagic fishery is taken further for the
complete data base from 1999 to 2004. Previously the analysis had been based on
steel vessels (Somhlaba et al., 2005); those findings showed that there were
statistically significant positive effects on catches given the presence of an observer
on the steel vessels. The results below include the analysis of the combined data for
all three categories of vessels: bait, ordinary and steel vessels. Sardine and anchovy
data were analysed in detail using one model but with two different error structures:
one lognormal (henceforth termed LogCPUE) and the other Poisson (henceforth termed
catch).
Description
Reference:
Somhlaba, S., Brandão, A., & Butterworth, D. S. (2005). Overall results for the effect of the presence of an observer on catches made by the pelagic fleet. Unpublished report MCM, South Africa. SWG/DEC2005/PEL/06.