Further results when interactions between the presence of observer and month are taken into account for steel vessels
Journal Article
2005
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MArine Resource Assessment and Management group
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University of Cape Town
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University of Cape Town
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Abstract
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 have been taken into
account, and also how this effect varies over a twelve month period. The evaluation of
these interactions and approach gives a clear indication of a trend in the effect of the
observer on catch rates for each month. Using the trend that emerged from the
interactions, the observer factor was redefined with three levels, two levels indicating the
presence of an observer for each six month period of the year and the other level
indicating absence of an observer.
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Reference:
Somhlaba, S., Brandao, A. & Butterworth, D.S. (2005). Further results when interactions between the presence of observer and month are taken into account for steel vessels.