학술논문
Potamodromous migrations in the Magdalena River basin: bimodal reproductive patterns in neotropical rivers.
Document Type
Article
Source
Subject
*FISH migration
*GONAD development
*WATER power
*PROCHILODUS
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*
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Language
ISSN
0022-1112
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. [ABSTRACT FROM AUTHOR]