Arapaima gigas (pirarucu) is a large fish greatly appreciated in Amazon region. The present work determined the weight-length relationship and the relative condition factor (Kn) of eviscerated pirarucu specimens from the extractive reserve (RESEX) of Juruá river, Amazonas, Brazil. The relative frequency distributions by weight class indicated amplitude between 20,000 and 115,000g and the classes of greatest frequency were between 30,000 and 80,000g. The equation 3.0157 that describes this relationship is W = 0.0092L , showing an isometric growth. Kn presented values of 0.98 ± 0.01, ranging between 0.94-1.01. The results indicate that fish stock of A. gigas in the RESEX of Juruá river presents good management conditions since most of the fish caught presented commercial weight and high utilization of meat, and also the equations of weight-length relationship and Kn values can be considered as reference for A. gigas eviscerated of the studied region.
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