Spatiotemporal dynamics of larvae and juveniles of two species of interest for fisheries in Itaipu: A big neotropical reservoir

Authors

  • Paulo Vanderlei Sanches Universidade Estadual do Oeste do Paraná – Centro de Engenharias e Ciências Exatas – Toledo (PR), Brazil. https://orcid.org/0000-0003-2159-9115
  • Rafael Olímpio Silva Universidade Estadual do Oeste do Paraná – Centro de Engenharias e Ciências Exatas – Toledo (PR), Brazil | Instituto Neotropical de Pesquisas Ambientais – Grupo de Pesquisa em Recursos Pesqueiros e Limnologia – Toledo (PR), Brazil. https://orcid.org/0000-0001-7743-1851
  • Tatiane Mary Gogola Universidade Estadual do Oeste do Paraná – Centro de Engenharias e Ciências Exatas – Toledo (PR), Brazil | Instituto Neotropical de Pesquisas Ambientais – Grupo de Pesquisa em Recursos Pesqueiros e Limnologia – Toledo (PR), Brazil. https://orcid.org/0000-0003-2685-3485
  • Pitágoras Augusto Piana Universidade Estadual do Oeste do Paraná – Centro de Engenharias e Ciências Exatas – Toledo (PR), Brazil | Instituto Neotropical de Pesquisas Ambientais – Grupo de Pesquisa em Recursos Pesqueiros e Limnologia – Toledo (PR), Brazil. https://orcid.org/0000-0002-4666-6663
  • Dirceu Baumgartner Universidade Estadual do Oeste do Paraná – Centro de Engenharias e Ciências Exatas – Toledo (PR), Brazil | Instituto Neotropical de Pesquisas Ambientais – Grupo de Pesquisa em Recursos Pesqueiros e Limnologia – Toledo (PR), Brazil. https://orcid.org/0000-0001-9943-6290

DOI:

https://doi.org/10.20950/1678-2305/bip.2024.51.e923

Keywords:

Ichthyoplankton, Itaipu reservoir, Plagioscion squamosissimus, Hypophthalmus oremaculatus

Abstract

The corvina (Plagioscion squamosissimus) and the mapará (Hypophthalmus oremaculatus) are two of the most explored fish species in the Itaipu reservoir region. However, information on the ecology and dynamics of their initial advances remains scarce. The objectives of this study were to evaluate the spatiotemporal occurrence of larvae and juveniles of these species in five arms of the Itaipu reservoir, determine the peak period of reproductive activity, identify spawning sites and initial development and evaluate the environmental effects on larval abundance. Monthly samples were collected from October to March between 2009 and 2018 in five arms in the left bank of the reservoir at sampling points distributed in the lacustrine, transition and river zones of each arm. The results demonstrated that the reproductive activity of P. squamosissimus peaked between January and March, while the H. oremaculatus one between October and January. Among all the physical and chemical variables discussed, although relevant to fish reproduction process, only temperature and pluviosity had the strongest effect on larval abundance. The highest larval density of both species was found in the lake zone in all applied arms, indicating that this zone is used as a place for spawning and initial development and is, therefore, a priority area for the conservation of the species.

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