Author(s): Brambilla, Eduardo Meneguzzi [UNESP] ; Silva, Luiz G. M. ; Baumgartner, Lee J. ; Bialetzki, Andrea ; Nogueira, Marcos Gomes [UNESP]
Date: 2021
Persistent ID: http://hdl.handle.net/11449/209552
Origin: Oasisbr
Subject(s): Fish passage; Ichthyoplankton; River conservation; Sapucai-Mirim River
Made available in DSpace on 2021-06-25T12:22:04Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-10-10
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
This study was conducted to investigate fish eggs and larvae dispersal in a river stretch influenced by small hydropower plants in Southeast Brazil. The main hypothesis is that the downstream dispersal of free-flowing eggs and larvae is likely to occur given the small size of the studied reservoirs and that passage through the dam may occur, with the fish ladder contributing to it. Eggs and larvae were collected fortnightly, between November 2016 and February 2017, from locations upstream of two dams, including lotic, transition and lentic zones. Additional samples were collected inside the fish ladders at each dam. Downstream dispersal of eggs and larvae was influenced by a combination of rainfall/flow variation and stage of the reproductive cycle, with the peak of rainfall during the summer coinciding with higher abundances. Under these conditions, eggs and larvae drifted downstream through the reservoirs and reached the dams. Once in the dam, they could pass through the fish ladder. This passage was correlated with larval density in the reservoir immediately upstream, although at very low densities compared with the other sampling sites located upstream of the fish ladders.
Univ Estadual Paulista, Inst Biociencias, Dept Zool, Programa Posgrad Ciencias Biol Zool, Botucatu, SP, Brazil
Charles Sturt Univ, Inst Land Water & Soc, Albury, NSW, Australia
Swiss Fed Inst Technol, Dept Civil Environm & Geomat Engn, Stocker Lab, Inst Environm Engn, Zurich, Switzerland
Univ Estadual Maringa, Programa Posgrad Ecol Ambientes Aquat Continentai, Nucleo Pesquisas Limnol Ictiol & Aquicultura, Maringa, Parana, Brazil
Univ Estadual Paulista, Inst Biociencias, Dept Zool, Programa Posgrad Ciencias Biol Zool, Botucatu, SP, Brazil
