Standardization of red porgy (Pagrus pagrus) CPUE derived from the commercial fleet in the Argentine-Uruguayan Common Fishing Zone. 2000-2011 period
Keywords:Southwest Atlantic Coastal System, red porgy, Pagrus pagrus, CPUE, GLM
In order to make progress in the construction of an abundance index for red porgy (Pagrus pagrus), a General Linear Model (GLM) was applied to catch per unit effort (CPUE) data derived from the Argentine commercial fleet that operated in the Argentine-Uruguayan Common Fishing Zone during the 2000-2011 period. To implement the model different factors and interactions that could affect the CPUE related to the structure and behaviour of the fleet analyzed in a previous study of the fishery were taken into account. The model allowed to explain 66% of the total variability. The factors (Year, Stratum, Season, Gear, Statistical square (c.e.) and Directionality of the fleet (Z)) and interactions (Year*Season, Year*Gear, Year*Z, c.e.*Season, c.e.*Gear, Season*Gear and Z*Gear) considered were significant. The contribution of interactions with the Year factor accounted only for 1.13% of the total variance explained. The results obtained would allow to consider the mean CPUE values estimated with the GLM as representative indices of the species annual abundance. The index showed an increasing trend throughout the period analyzed. The nominal CPUE of the standard fleet showed a similar trend. It is considered that the incorporation of economic variables and the métier factor would improve estimates of the relative abundance of the resource. The métier is a multivariate factor that synthesizes the information of the area, season, fleet stratum and trips typology or catch profile variables considered in this work. This might increase the proportion of total variance explained and affect the current CPUE estimates.
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Copyright (c) 2014 Ángeles Nerina Lagos, María Rita Rico, Sebastián García, Nora Cristina Fernández Aráoz
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