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Influence of the Abaeté River on the reproductive success of the neotropical migratory teleostProchilodus argenteus in the São Francisco River, downstream from the Três Marias Dam, southeastern Brazil

2005; Wiley; Volume: 21; Issue: 8 Linguagem: Inglês

10.1002/rra.859

1535-1467

Yoshimi Sato, Nilo Bazzoli, Elizete Rizzo, Maria Beatriz Boschi, M. O. T. de Miranda,

Fish Ecology and Management Studies

River Research and ApplicationsVolume 21, Issue 8 p. 939-950 Research Article Influence of the Abaeté River on the reproductive success of the neotropical migratory teleost Prochilodus argenteus in the São Francisco River, downstream from the Três Marias Dam, southeastern Brazil Yoshimi Sato, Yoshimi Sato Hydrobiology and Fishculture Station of Três Marias, Minas Gerais—CODEVASF, BrazilSearch for more papers by this authorNilo Bazzoli, Nilo Bazzoli Graduate Program on Zoology of Vertebrates, Pontifical Catholic University of Minas Gerais (PUC-Minas), BrazilSearch for more papers by this authorElizete Rizzo, Corresponding Author Elizete Rizzo [email protected] Department of Morphology, Institute of Biological Science, Federal University of Minas Gerais (ICB/UFMG), BrazilDepartment of Morphology, ICB-UFMG, PO Box 486, 30161-970, Belo Horizonte, MG, Brazil.Search for more papers by this authorMaria Beatriz Boschi, Maria Beatriz Boschi Brazilian Institute for the Environmental and Renewable Natural Resources (IBAMA), BrazilSearch for more papers by this authorMario O. T. Miranda, Mario O. T. Miranda Brazilian Institute for the Environmental and Renewable Natural Resources (IBAMA), BrazilSearch for more papers by this author Yoshimi Sato, Yoshimi Sato Hydrobiology and Fishculture Station of Três Marias, Minas Gerais—CODEVASF, BrazilSearch for more papers by this authorNilo Bazzoli, Nilo Bazzoli Graduate Program on Zoology of Vertebrates, Pontifical Catholic University of Minas Gerais (PUC-Minas), BrazilSearch for more papers by this authorElizete Rizzo, Corresponding Author Elizete Rizzo [email protected] Department of Morphology, Institute of Biological Science, Federal University of Minas Gerais (ICB/UFMG), BrazilDepartment of Morphology, ICB-UFMG, PO Box 486, 30161-970, Belo Horizonte, MG, Brazil.Search for more papers by this authorMaria Beatriz Boschi, Maria Beatriz Boschi Brazilian Institute for the Environmental and Renewable Natural Resources (IBAMA), BrazilSearch for more papers by this authorMario O. T. Miranda, Mario O. T. Miranda Brazilian Institute for the Environmental and Renewable Natural Resources (IBAMA), BrazilSearch for more papers by this author First published: 12 August 2005 https://doi.org/10.1002/rra.859Citations: 58AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract The curimatã-pacu Prochilodus argenteus is an important characiform from the São Francisco River basin that performs long-distance migrations for spawning upstream during the rainy season, when the temperature and photoperiod are elevated. Despite the interruption of the migratory routes by the Três Marias Dam and accentuated decline in fishing, the curimatã-pacu still sustains the fisheries at the Três Marias region in recent decades. The objective of this study was to evaluate the reproductive activity of P. argenteus in two sections of the São Francisco River, downstream from the Três Marias Dam, during the rainy season. In the first 34 km of the river, immediately below the dam, most of the females were in gonadal resting. At 34–54 km downstream from the dam, following the confluence with a medium-sized tributary, the Abaeté River, there was a high frequency of males and females in reproductive activity. Follicular atresia was more frequent in the upper section of the river while postovulatory follicles occurred predominantly in the lower section. Fulton's condition factor and gonadosomatic index indicated that the females were in a better physiological and reproductive condition below the confluence with the Abaeté River. In contrast to the females, the males were less affected by damming, and testicular maturation was largely achieved in two river sections. Thus, although the section of the São Francisco River immediately below the Três Marias Dam was found to be unfavourable for the reproduction of the migratory fishes due principally to the hypolimnetic water from the reservoir, reproductive success of P. argenteus was achieved below the Abaeté River. In this section, the species encountered appropriate conditions for maturation and spawning, i.e. warm temperatures above 24°C, high water flow and dissolved oxygen, and low water transparency. These results indicate the importance of a non-regulated tributary to minimize the ecological impact of a dam on the downstream native fish communities. Copyright © 2005 John Wiley & Sons, Ltd. Citing Literature Volume21, Issue8October 2005Pages 939-950 RelatedInformation