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Specimens were collected in piedmont rivers with a conductivity of 513 - 1,434 µS, water temperatures 18.6 - 25.5 °C, pH 6.93 - 7.78, and Secchi visibility 5 - 122 centimeters. These parameters change between the dry and rainy seasons, which, respectively, occur in the type locality region from December to March and from April to November (data provided by IDEAM, Instituto de Metereologia, Hidrologia y Estudios Ambientales, Colombia). The species commonly inhabits wide portions of the river and small embayments along the river bank where water flow is minimal. It is observed to form schools of variable numbers of individuals at different depths within the water column or grazes along the river bottom. Mature males were captured during both the dry and rainy seasons over a five-month period of continuous sampling, wher four of which fell within the dry season. Mature females and larvae were, instead, captured only during the dry season (Ref. 55562). |