Estimate of the relative fishing power and the relative efficiency between the commercial net and dredge in Patagonian scallop fishery
Keywords:Fishing power, relative efficiency, fishing gear, trawl net, dredge, Zygochlamys patagonica
To accurately assess fish and invertebrate populations, the catch values obtained in research surveys are converted to absolute values considering the swept area and fishing gear efficiency. In the 1998-2007 period, Zygochlamys patagonica assessment surveys were carried out on board of the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) research vessels using the dredge as fishing gear. Between 2008 and 2012 they were performed on board of commercial vessels of the scallop fleet with the net proper to each vessel. In order to normalize the temporal series of basic data, in this work the relative fishing power and the relative efficiency between both fishing gears were estimated. Considering the 0.5 dredge efficiency value currently applied, an estimate of 0.3468 net efficiency was obtained. Said result is valid for the vessel, fishing gear, dredge, management unit and time of the year in which the experience took place. The need of estimating the true efficiency of the dredge used in Patagonian scallop biomass assessment through an experimental ad hoc study is hereby emphasized
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Copyright (c) 2017 Silvana Campodónico, Mariana Escolar, Aníbal Aubone
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