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Browsing by Author "Somhlaba, S"

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Further results when interactions between the presence of observer and month are taken into account for steel vessels

Author: Somhlaba, S ; Brandão, Anabela ; Butterworth, Doug S Date: 2005 Interactions between the presence of an observer and month are investigated for both anchovy and sardine fisheries. The aim is to ascertain whether the effect of the presence of an observer still remains significant after these interactions ... Read more
An indirect investigation of the possible influence of port on the estimation of observer effects on catch rates in the pelagic fishery

Author: Somhlaba, S ; Brandão, Anabela ; Plagányi, Éva E ; Butterworth, Doug S Date: 2006 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 ... Read more
Overall results for the effect of the presence of an observer on catches made by the pelagic fleet

Author: Somhlaba, S ; Brandão, Anabela ; Butterworth, Doug S Date: 2005 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 ... Read more
Preliminary results of observer effect on pelagic fleet taking into account observer data from 1999 to 2011

Author: Somhlaba, S ; Brandão, Anabela ; Butterworth, Doug S ; van der Westhuizen, J Date: 2014 A detailed update of the study of the data collected by scientific observers onboard the pelagic vessels is currently underway. The use of small pelagic commercial data base and an observer data base to investigate the effect of observers ... Read more
Revised results on the effect of observers on board pelagic fleets

Author: Somhlaba, S ; Brandão, Anabela ; Butterworth, Doug S Date: 2005 This is a revised report on pelagic data analyses which aim to quantify the amount of dumping, or confirm the absence thereof, that is happening in pelagic fisheries. This study includes the analyses of anchovy data which was not included ... Read more

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Browsing by Author "Somhlaba, S"

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