Length-weight relationship of rubio (Salminus affinis Steindachner, 1880) in the Sinu river basin, Colombia

Between January 2000 and August 2005, 122 individuals with sizes between 9.3 and 63.0 cm total length (TL) and weight (WT) ranging between 6.6 to 3966.0 g were collected. The length-weight relationship was: TW = 0.005 TL3.19, positive allometric growth coefficient (b), and correlation coefficient of 0.99. The growth coefficient varied between 3.34 y 3.21 without statistically significant differences. The condition factor oscillated between 0.003 y 0.005, without statistically significant differences. A correlation among the condition factor, the level of the Sinu river, and spawning season of the rubio, which extends from March to September was found.