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Edad y crecimiento del morocoto Piaractus brachypomus en la región del Orinoco medio en Venezuela

The age of Piaractus brachypomus was determined by decomposing the distribution of length frequencies in cohorts that represented ages, using the Battacharya method; while the growth study was done by inference of multiple models, using the Akaike information criterion (AIC) to select the best fit. The models proposed were the unified versions of the model of Richards (U-Richards), von Bertalanffy (U-von Bertalanffy), Logistic (U-Logistic) and Gompertz (U-Gompertz). The age was between one and three year of age (y), with fish from one y measuring 13.0 ± 1.9 centimeter (cm) of (TL), those from two y 25.2 ± 3.0 cm of total length, and those from three 36.3 ± 2.8 cm of total length. From the statistical point of view, shape of the curve, AIC and biological, the best fit model was the U-Gompertz, which produced a sigmoidal curve determined by an asymptotic length of L ∞ = 71.9 cm of TL, a relative growth rate K = 0.148 y -1 , a point of inflection in the curve T i = 2.02 y and an initial point of the curve W o = 8 cm of TL. P. brachypomus presented a relatively 
slow growth that makes it vulnerable to fishing exploitation, and therefore, must be properly managed.