Environmental Biology of Fishes

, Volume 91, Issue 1, pp 51–61 | Cite as

Distribution and abundance of fish eggs and larvae in three tributaries of the Upper Uruguay River (Brazil)

  • Rogério Nappi Corrêa
  • Samara Hermes-Silva
  • David Reynalte-Tataje
  • Evoy Zaniboni-Filho
Article

Abstract

The present study aimed to investigate the distribution and abundance of fish eggs and larvae in three important tributaries (Chapecó, Peixe, and Ligeiro rivers) of the Upper Uruguay River. The spatial and temporal distribution of fish eggs and larvae were studied as well as the correlation between environmental parameters and the abundance of ichthyoplankton species. The study was conducted between October 2005 and September 2006. Ichthyoplankton samples were collected at night with cylindroconical 0.5-mm mesh plankton nets every 5 days. Of the 591 samples collected, 170 contained ichthyoplankton organisms, resulting in the capture of 12,847 fish eggs and 962 fish larvae. Twenty-seven fish species were observed, of which 69% were Characiforms and 27% were Siluriforms. Among the fish species captured, the representatives were predominantly young forms of small and medium size fishes, with rheophilic species occurring infrequently. Eggs occurred exclusively between October and January, while the highest larvae occurrence was observed between November and December. Fish larvae assemblage structure was shown to be related to some environmental variables. There was a tendency of higher values of water temperature and velocity at the lower sampling sites than at the upper ones, as well an increase number of eggs and larvae. The study tributaries serve as reproduction sites and nursery areas for several fish species of the Upper Uruguay River; thus, the maintenance of their integrity is important for the preservation of diversity and enhancement of fisheries in the region.

Keywords

Ichthyoplankton Spatiotemporal distribution Spawning sites Nursery areas Abiotic factor 

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Rogério Nappi Corrêa
    • 1
  • Samara Hermes-Silva
    • 1
  • David Reynalte-Tataje
    • 1
  • Evoy Zaniboni-Filho
    • 1
    • 2
  1. 1.Laboratório de Biologia e Cultivo de Peixes de Água Doce (LAPAD), Aquaculture Department, Agrarian Sciences CenterFederal University of Santa CatarinaFlorianópolisBrazil
  2. 2.FlorianópolisBrazil

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