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Neotropical Ichthyology 52229232 2007Carlos Bernardo Mascarenhas Alve


Centro de Transposio de Peixes UFMG Avenida Antnio Carlos 6627 31270-901 Belo Horizonte MG BrazilPrograma de Ps-Graduao em Engenharia Mecnica UFMG e Centro Universitrio de Belo Horizonte UNI-BH Av Pro

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Document on Subject : "Neotropical Ichthyology 52229232 2007Carlos Bernardo Mascarenhas Alve"— Transcript:

1 Neotropical Ichthyology, 5(2):229-232, 2
Neotropical Ichthyology, 5(2):229-232, 2007Carlos Bernardo Mascarenhas Alves*, Luiz Gustavo Martins da Silva**and Alexandre Lima Godinho* (Ihering, 1898), a large migratory catfish endemic to the rio da Prata basin, has a fragile conservation statusand its ecology is poorly known. We radio-tracked a female jaú with a total length of 1.5 m that was passed upstream of FunilDam, rio Grande, to describe its migratory movements, habitat use, linear home range, and diel activity. To track the fish, wemade five tracking trips in the period from April, 2003 to January, 2004. In addition to the main body of Funil Reservoir, the the times, we found the fish in the former beds of streams flooded by the reservoi

2 r, at depths that ranged from 8-9 m in t
r, at depths that ranged from 8-9 m in thereservoir-river transition zone to 18-21 m in Funil Reservoir. Linear home range of the fish was 31.4 km. The onset of activityoccurred early in the evening, but we also detected daytime activity. The conclusion from our study was that the passed adultreservatório de Funil. A área de vida linear foi de 31,4 km. O período de atividade ocorreu no início da noite mas também *Centro de Transposição de Peixes (UFMG), Avenida Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil.**Programa de Pós-Graduação em Engenharia Mecânica, UFMG, e Centro Universitário de Belo Horizonte (UNI-BH), Av. ProfessorMário Werneck, 1685, 30455-610 Belo Horizonte, MG, Brazil. lui

3 ctio@icb.ufmg.br (Ihering, 1898), is end
ctio@icb.ufmg.br (Ihering, 1898), is endemic to the riversrio Uruguay), occurring in Argentina, Bolivia, Brazil, and Para- 2003). Jaú., 2004). However, jaú has been overex- 2003;Resende, 2003). Also, it has practically disappeared in the C. B. M. Alves, L. G. M. da Silva & A. L. Godinhobe unnecessary at Funil Dam. However, this finding needs toIn September, we located the fish at 10:50 h in the maintance). At 19:46 h, the fish moved and, 24 min later, we foundit 360 m (linear distance) away. The fish stayed still until 20:48h, when it moved again. We then searched for the fish for twoh). However, the tagged jaú also showed day-time activity.We detected the fish moving at noon, covering a distance of7

4 64 m in 30 min, on one day, and 328 m in
64 m in 30 min, on one day, and 328 m in 2 h, on another day.displays diurnal activity.We found in this study that the passed adult female jaúMovements of jaú in Funil Reservoir, rio Grande, andTable 1. Number, coordinates, and depth of locations of thetagged jaú in Funil Reservoir, rio Grande (MG, Brazil). * Re- Fish location Date Number Coordinates Depth (meters) March, 2003* 1 21º 08 07 S 45º 01 04 W April, 2003 2 21º 08 09 S 44º 50 22 W June, 2003 3 21º 07 03 S 44º 57 24 W 21 September, 2003 21º 07 04 S 44º 57 28 W 18 November, 2003 21º 08 12 S 44º 51 02 W January, 2004 6 21º 09 49 S 44º 54 36 W Map of Funil Reservoir showing locations (%) of the tagged jaú. Location numbers as in Table