Ictiofauna do Rio Leão no Assentamento 8 de Junho – PR

Abstract

The present study was developed in the watershed of the river Leão, in the Settlement 8 de Junho, municipality of Laranjeiras do Sul - PR. The region is predominantly agricultural, characterized by the dominance of family farming and the existence of small industries. The objective of this work was to analyze the ichthyofauna of the Leão River in the Settlement 8 de Junho, a settlement area originating from the Movimento dos Trabalhadores Rurais Sem Terra (MST). For this purpose, the field research method was used, with four campaigns being carried out from August/2022 to April/2023, at 4 points distributed in the stretch that crosses the Settlement 8 de Junho, in an extension of ~5, 28 km from the river. For the collections, gill nets, pike nets, longline nets and cast nets were used. In each campaign, the identification, weighing and measurement of the collected fish was carried out, as well as the evaluation of abiotic data of the water (transparency, dissolved oxygen, temperature - of the water and environment, ammonia, nitrite, alkalinity, and hardness). In total, 214 fish (total biomass 6,053.06 g) were obtained, distributed in 4 orders, 7 families, 11 genera and 14 species (12 identified and 2 unidentified), all native to the watershed. The most frequent species in the 4 seasons were Hypostomus derbyi, Psalidodon bifasciatus and Rhamdia branneri. The Leão river presents species of interest for the development of scientific research in aquaculture and aquarism.