THE IMPORTANCE OF FREE STRETCHES IN A DAMMED RIVER TO THE MAINTENANCE OF Schizodon intermedius POPULATIONS

Autor(es)

Nobile, Andre Batista ^[1] ; de Lima, Felipe Pontieri ^[1] ; Freitas-Souza, Diogo ^[1] ; Kruger Paes, Jaciara Vanessa ^[1] ; de Castro Britto, Sandro Geraldo ^[1] ; Vidotto-Magnoni, Ana Paula ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, UNESP, Inst Biociencias Botucatu, Dept Morfol, Lab Biol & Genet Peixes, R Prof Dr Antonio Celso Wagner Zanin 250, BR-18618613 Botucatu, SP - Brazil

^[2] Univ Estadual Londrina, Dept Biol Anim & Vegetal, Lab Ecol Peixes & Invasoes Biol, Rodovia Celso Garcia Cid, PR 445, Km 380, BR-86057970 Londrina, PR - Brazil

• Tipo de documento: Artigo Científico
• Fonte: BOLETIM DO INSTITUTO DE PESCA; v. 45, n. 1 2019.
• Citações Web of Science: 1

Resumo

This paper focuses on to evaluate the importance of a free stretches upstream of a Neotropical reservoir for the maintenance of Schizodon intermedius populations, a medium size migratory species and important fisheries resources. Quarterly samplings were carried out in 8 sampling sites, distributed in Jurumirim Reservoir and two tributaries upstream reservoir. Reproductive, populational and feeding strategies were used to evaluate the importance of each sample area in the biological cycle of this species. Results showed that S. intermedius makes different uses of the sites. In the rainy season, individuals in the lower areas presented higher condition factor and average repletion degree of stomach, assuming that are used for growth and feeding and; in the upper areas, higher size and GSi values, suggesting that are reproductive area. We conclude that Schizodon intermedius uses lentic areas to gain energy in dry season, and in the rainy season, uses this energy to migrate to lotic stretches to reproduction. The stretches upstream free of dam are essential for this migratory species maintain viable populations in an environment impaired by dams. (AU)

• Processo FAPESP: 10/19543-6 - A integridade ambiental da Represa de Jurumirim (Alto Rio Paranapanema, SP, Brasil) com base na ictiofauna, supra-comunidades de parasitas, dieta e migração dos peixes
• Beneficiário: Edmir Daniel Carvalho
• Modalidade de apoio: Auxílio à Pesquisa - Regular