Earlier GLM analyses of catch per hour data for sardine and anchovy to determine
observer effects have suggested statistically significant increases in this catch rate
with observers on the vessels over January-to June for the sardine fishery, and over
May to October for the anchovy fishery (Somhlaba et al. 2006). This in turn has
raised the possibility that this may reflect (and provide quantification of the extent of)
slippage in the catching operations conducted without observers present.
Reference:
Somhlaba, S., Brandão, A., Plagányi, É.E. & Butterworth, D.S. (2006). An indirect investigation of the possible influence of port on the estimation of observer effects on catch rates in the pelagic fishery. Marine and Coastal Management document: WG/MAY2006/PEL/04: 1-4.
Somhlaba, S., Brandão, A., Plagányi, É. E., & Butterworth, D. S. (2006). An indirect investigation of the possible influence of port on the estimation of observer effects on catch rates in the pelagic fishery University of Cape Town. Retrieved from http://hdl.handle.net/11427/17843
Somhlaba, S, Anabela Brandão, Éva E Plagányi, and Doug S Butterworth An indirect investigation of the possible influence of port on the estimation of observer effects on catch rates in the pelagic fishery. University of Cape Town, 2006. http://hdl.handle.net/11427/17843
Somhlaba S, Brandão A, Plagányi ÉE, Butterworth DS. An indirect investigation of the possible influence of port on the estimation of observer effects on catch rates in the pelagic fishery. 2006 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17843
