Acta Limnologica Brasiliensia
http://www.alb.periodikos.com.br/article/doi/10.1590/S2179-975X1325
Acta Limnologica Brasiliensia
Short Research Note

First record of the “Matrinxã” Brycon amazonicus (Agassiz 1829) (Characiformes: Bryconidae) in the Rio Paranapanema mouth region, Upper Rio Paraná basin, Brazil

Primeiro registo do “Matrinxã” Brycon amazonicus (Agassiz 1829) (Characiformes: Bryconidae) na região da foz do Rio Paranapanema, bacia do Alto Rio Paraná, Brasil

Renan Borges dos Reis; Bruno Henrique Mioto Stabile; Augusto Frota; Weferson Júnio da Graça

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Abstract

The Rio Paranapanema is one of the most important tributaries of the Upper Rio Paraná, and in recent decades there has been a marked decline in the population of native species due to the development of a series of reservoirs and the introduction of many non-native fish species. This study presents the first record of the non-native Brycon amazonicus in the mouth region of the Rio Paranapanema. One specimen was collected in May 2024 in the Porto Maringá region, Marilena municipality, Paraná state, Brazil. The specimen was euthanized with benzocaine, fixed in 10% formalin, and later preserved in 70% ethanol. Morphometric measurements were taken using a digital caliper, and meristic data were recorded according to specific literature. Our results show that the Brycon specimen collected in the region of the mouth of the Rio Paranapanema fits the diagnosis of the non-native Brycon amazonicus. The presence of this species raises concerns regarding its potential impact on native Brycon species, especially Brycon orbignyanus, which is critically endangered. Introduction of Brycon amazonicus in this region may be associated with accidental escapes from aquaculture, sport fishing, or stocking programs in reservoirs. The record of Brycon amazonicus in this highly impacted environment underscores the need for continuous monitoring and management strategies to mitigate potential threats to native ichthyofauna and preserve the ecological integrity of the Upper Paraná ecoregion.

Keywords

endemic fish species, extinction risk, invasive species, reservoir cascades, Upper Rio Paraná floodplain

Resumo

O Rio Paranapanema é um dos mais importantes afluentes do alto Rio Paraná e nas últimas décadas houve um declínio acentuado na população de espécies nativas devido ao desenvolvimento de uma série de reservatórios e à introdução de várias espécies de peixes não nativas. Este estudo apresenta o primeiro registro da espécie não nativa Brycon amazonicus na região da foz do rio Paranapanema. Um espécime foi coletado em Maio de 2024 na região do Porto Maringá, Município de Marilena, estado do Paraná, Brasil. O espécime foi eutanasiado com benzocaína, fixado em formaldeído 10% e depois preservado em álcool 70%. Medidas morfométricas foram realizadas com auxílio de paquímetro digital e dados merísticos foram realizados de acordo com literatura especifica. Nossos resultados mostram que o espécime de Brycon coletado na região da foz do rio Paranapanema se encaixa na diagnose de Brycon amazonicus. A presença dessa espécie levanta preocupações sobre seu impacto potencial nas espécies nativas de Brycon, especialmente B. orbignyanus, que está criticamente ameaçada de extinção. A introdução de Brycon amazonicus nessa região pode estar associada a escapes acidentais da aquicultura, pesca esportiva ou programas de peixamento em reservatórios. O registro de Brycon amazonicus nesse ambiente altamente impactado ressalta a necessidade de monitoramento contínuo e de estratégias de manejo para mitigar possíveis ameaças à ictiofauna nativa e preservar a integridade ecológica da ecorregião do alto Paraná.

Palavras-chave

espécies de peixes endêmicos, risco de extinção, espécie invasora, cascata de reservatórios, planície de inundação do Alto Rio Paraná

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Submitted date:
15/02/2025

Accepted date:
23/04/2025

Publication date:
12/09/2025

68c47af6a95395229a405d03 alb Articles
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Acta Limnol. Bras. (Online)

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