Life strategy of Astyanax lacustris (Characiformes: Characidae) in different habitats of the Upper Paraná River basin

Augusto Gabriel Jatobá  Fernandes; Gabriela Correia de  Oliveira; Lucas Henrique dos Santos; Matheus Chueire  Luiz; Luccas Machado de  Andrade; Gabriele Rossatto  Pena; Mario Luis Orsi

doi:10.4025/actascibiolsci.v47i1.76785

Augusto Gabriel Jatobá Fernandes Universidade Estadual de Londrina https://orcid.org/0009-0007-9693-6725
Gabriela Correia de Oliveira Universidade Estadual de Londrina
Lucas Henrique dos Santos Universidade Estadual de Londrina https://orcid.org/0000-0002-5850-0089
Matheus Chueire Luiz Universidade Estadual de Londrina https://orcid.org/0009-0000-4507-1871
Luccas Machado de Andrade Universidade Estadual de Londrina https://orcid.org/0009-0001-6683-3254
Gabriele Rossatto Pena Universidade Estadual de Londrina https://orcid.org/0009-0008-4905-3863
Mario Luis Orsi Universidade Estadual de Londrina https://orcid.org/0000-0001-9545-4985

DOI: https://doi.org/10.4025/actascibiolsci.v47i1.76785

Palavras-chave: Yellow-tailed; lambari; Tibagi River; Paranapanema basin.

Resumo

The current study was carried out in the Tibagi River basin, an important tributary of the Paranapanema River, in the southern region of Brazil. Research with fish from the Neotropical region is extremely important to understand the ecological dynamics of the region. In this context, we chose to study the reproductive variables of the species Astyanax lacustris, a Characiform known in the region for its reproductive plasticity and great importance in the trophic chain. The study area contained four data collection points, namely Limoeiro, Três Bocas, Congonhas I, and Congonhas II, where individuals of A. lacustris were collected using different capture methodologies. In total, 1553 individuals were collected, with 100% consistency in all stretches. Congonhas I and Congonhas II provided 76.3% of the total number sampled. In general, it was noted that the females of the species are more represented in the longer length classes, while males are more abundant in the shorter length classes, except for the Congonhas II stretch, where females were more abundant in all length classes. Analysis of oocytes collected from 639 females indicates that the species A. lacustris spawns in installments, and that its reproduction is conditioned and modified by biotic and abiotic environmental issues.

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