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This study estimated the a and b parameters of the length–weight relationships of 15 fishes from the Mira and Caunapí rivers, San Andrés de Tumaco, Nariño, Colombia. The specimens were captured during four samplings periods between 2015 and 2016 using a different a combination of fishing gillnets and electrofishing. The a values ranged from 0.0002 to 0.04 and b values ranged from 2.86 to 3.6. The data presented here are tentative estimates because the fish have been weighted and measured after fixation in formalin and ethanol, however, these data are references for weight‐length relationship for 15 species, the maximum weight for the same 15, and new maximum lengths for 3 species.

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PRESENTACIÓN 5 INTRODUCCIÓN 13 LA CUENCA BINACIONAL DEL RÍO MIRA 14 Generalidades de la cuenca 14 Las expediciones 16 CLAVE ARTIFICIAL PARA ESPECIES 31 LOS PECES 43 LAS ESPECIES 45 Orden Characiformes 46 Familia Erythrinidae 46 Hoplias malabaricus Familia Curimatidae 48 Pseudocurimata lineopunctata Pseudocurimata patiae Familia Lebiasinidae 52 Lebiasina narinensis Familia Ctenoluciidae 54 Ctenolucius beani Familia Characidae 56 Eretmobrycon dahli Eretmobrycon miraensis Hyphessobrycon aff. chocoensis Pseudochalceus longianalis Roeboides occidentalis Familia Bryconidae 66 Brycon argenteus Brycon sp Brycon oligolepis Brycon posadae Orden Gymnotiformes 74 Familia Hypopomidae 74 Brachyhypopomus occidentalis Familia Sternopygidae 76 Sternopygus sp. Orden Siluriformes 78 Familia Trichomycteridae 78 Trichomycterus latidens Trichomycterus taenia Familia Astroblepidae 82 Astroblepus chotae Astroblepus cirratus Astroblepus cyclopus Astroblepus grixalvii Astroblepus aff. longifilis Astroblepus mojicai Familia Loricariidae 94 Chaetostoma marginatum Rineloricaria jubata Familia Heptapteridae 98 Pimelodella eutaenia Pimelodella grisea Rhamdia guatemalensis Familia Pseudopimelodidae 104 Cruciglanis sp.