thumbnail

Movement patterns of armado, Pterodoras granulosus, in the Parana?? River Basin

Ecology of Freshwater Fish

By:
, , , , ,
DOI: 10.1111/j.1600-0633.2007.00238.x

Links

Abstract

We studied the migratory behaviour of armado, Pterodoras granulosus, in the Parana?? River Basin of Brazil, Paraguay and Argentina, during 1997-2005. This species invaded the Upper Parana?? River after upstream dispersal was facilitated when Itaipu Reservoir inundated a natural barrier. Fish were tagged (N = 8051) in the mainstems of the Yacyreta and Itaipu reservoirs, bays of major tributaries, the Parana?? River floodplain above Itaipu Reservoir, and below dams. In all, 420 fish were recaptured of which 61% moved away from the release area. Fish moved a maximum of 215 km (mean 42), and at a maximum rate of 9.4 km??day-1 (mean 0.6). Of the 256 armados that moved away from the release site, 145 moved upstream towards unimpounded stretches of the Parana?? River and 111 moved downstream into the reservoir and bays of its tributaries (maximum 150 km). Based on the observed migratory movements, we suspect that most of the reproductive output originates in tributaries to the reservoirs. The ability of this species to expand its range presents a conundrum by pitting fishery management interests against conservation needs. Maintenance of the important armado fisheries depends on the ability of the species to migrate freely to use spawning and nursery areas in reservoir tributaries and floodplains. However, its ability to migrate long distances can allow this non-native species the opportunity to invade most of the Upper Parana?? River. ?? Journal compilation 2007 Blackwell Munksgaard No claim to original US government works.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Movement patterns of armado, Pterodoras granulosus, in the Parana?? River Basin
Series title:
Ecology of Freshwater Fish
DOI:
10.1111/j.1600-0633.2007.00238.x
Volume
16
Issue:
3
Year Published:
2007
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Ecology of Freshwater Fish
First page:
410
Last page:
416
Number of Pages:
7