title: Potamodromous migrations in the Magdalena River basin: bimodal reproductive patterns in neotropical rivers.
abstract: Magdalena River basin potamodromous fishes have two annual reproductive seasons: the subienda in the first half of the year and the mitaca in the second. Both upstream migrations are c. 30-45 days long; after that, with the onset of the rainy season, fishes spawn and remain in the river (resident individuals) or start a downstream movement (the bajanza) to return to the Magdalena floodplain lakes (nursery, shelter and feeding grounds). Due to their particular gonad development the bocachico Prochilodus magdalenae and probably the comelón Leporinus muyscorum are physiologically able to undertake two annual basin migrations. In the presence of dams or hydropower structures, fishes are able to find alternative migration routes. Some species should be re-classified in their migratory behaviour.
authors.affiliation: Grupo de Ictiología, Universidad de Antioquia, Calle 67 Número 53,108, laboratorio 7-308, 050010, Medellín, Antioquia, Colombia.
authors.forename: S
authors.initials: S
authors.lastname: López-Casas
authors.affiliation: Grupo de Ictiología, Universidad de Antioquia, Calle 67 Número 53,108, laboratorio 7-308, 050010, Medellín, Antioquia, Colombia.
authors.forename: L F
authors.initials: LF
authors.lastname: Jiménez-Segura
authors.affiliation: Nupelia, Universidade Estadual de Maringá, Avenida Colombo 5790, 87020-900, Maringá, Paraná, Brazil.
authors.forename: A A
authors.initials: AA
authors.lastname: Agostinho
authors.affiliation: Equipo Ambiental, Isagen S.A., Carrera 43 A No. 11 A 80, Medellín, Antioquia, Colombia.
authors.forename: C M
authors.initials: CM
authors.lastname: Pérez
mesh_terms: D025041:Animal Migration; D000818:Animals; D060125:Characiformes / Q000502:physiology*; D003105:Colombia; D005399:Fishes; D011891:Rain; D012098:Reproduction; D045483:Rivers; D012621:Seasons
keywords: La Miel River; flow regime; freshwater migratory fish; mark-recapture; migration routes; migration speed and distance