Inventory of the fish fauna from Laranjinha River, Paranapanema River system, Brazil

Bruno Ambrozio Galindo,Caroline Apolinário-Silva,Silvia Helena Sofia,Dhiego Gomes Ferreira,Raul Henrique Cardoso Nascimento,Sandremir De Carvalho,Augusto Seawright Zanatta,Alexandro Derly Augusto Costa,Oscar Akio Shibatta,Wilson Frantine-Silva,Thiago Deruza Garcia,Willian Massaharu Ohara,Renata Rúbia Ota

doi:10.1590/1676-0611-bn-2020-0962

Abstract

Abstract: This work is the most comprehensive survey of the Laranjinha River´s fishes, a tributary of the Cinzas River, Paranapanema River basin. Throughout its course, there is only a low-height dam, including a transposition system located 98 km from its mouth. The sampling was carried out in nine locations, from the source to the mouth, with six field incursions in each location, using different fishing gear. A total of 11,924 fish were collected, distributed in seven orders, 27 families, and 100 species. The most representative order in the number of species was Siluriformes, followed by Characiformes. As for the families, Loricariidae comprised 21% and Characidae 14% of species richness. Phalloceros harpagos was the species with the highest absolute abundance, representing 11.3% of the total, followed by Hypostomus ancistroides with 9.8%. However, considering the average abundance and frequency of occurrence, Hypostomus ancistroides was the most abundant species, followed by Hypostomus cf. paulinus, Psalidodon aff. paranae and Phalloceros harpagos. Among the collected species, the Apteronotus acidops, Brycon orbygnianus, Brycon nattereri, Crenicichla jupiaensis, and Rhinelepis aspera were classified as endangered on the most recent IUCN Red List. Also, from the total sampled fish, 9.8% are considered non-native species. Among the native species recorded, 10 species are large migratory species, which indicates that the Laranjinha River is a route for spawning and maintenance of species diversity in the middle Paranapanema River. Therefore, the Laranjinha River is a heritage of fish diversity and deserves special attention in its preservation.

Highlights

In the last few decades, human actions have caused numerous environmental changes, which emphasizes the need to know the local biodiversity, in order to reduce harmful activities
The Paranapanema River, a major tributary of the upper Paraná River, is currently fragmented by several hydroelectric dams (Britto & Carvalho 2006), and its dam-free tributaries are of great importance for the maintenance of fish species (Hoffmann et al 2005, Silva et al 2017, Galindo et al 2019, Lansac-Tôha et al 2019)
The Cinzas River is an important tributary of the Paranapanema River basin, which is the main watercourse of the region known as “Norte Pioneiro” (Pioneer North) of the Paraná state, and it is essential for maintaining ichthyofauna biodiversity of the Capivara reservoir (Vianna & Nogueira 2008, Orsi 2010)

Summary

Introduction

In the last few decades, human actions have caused numerous environmental changes, which emphasizes the need to know the local biodiversity, in order to reduce harmful activities. To this extend, the creation of inventories contribute to the discovery and description of new species before their extinction, contributing to the creation of new records, to the knowledge about geographical distribution, the documentation of non-native species, the defininition of biogeographic patterns, and the establishment of suitable conservation strategies (Costello et al 2011, Ota et al 2015, Frota et al 2019). The Cinzas River is an important tributary of the Paranapanema River basin, which is the main watercourse of the region known as “Norte Pioneiro” (Pioneer North) of the Paraná state, and it is essential for maintaining ichthyofauna biodiversity of the Capivara reservoir (Vianna & Nogueira 2008, Orsi 2010)

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Results

Conclusion