“…Even though data on swimming capacity derived from laboratory experiments is available for some species (Santos et al, 2009(Santos et al, , 2012Castro et al, 2010;Duarte et al, 2012;Sampaio et al, 2012;Duarte, Santos, 2014), little research has examined the swimming performance of Neotropical migratory species in natural river systems and most data are derived from mark-recapture studies that may considerably underestimate actual speeds (Godoy, 1975;Delfino, Baigun, 1985). Few studies have measured the migration speeds of Neotropical species during spawning or post-spawning migrations using field-collected biotelemetry data (Godinho et al, 2007;Andrade Neto, 2008;Fries, 2013;Pérez, 2014).…”