Inventário da ictiofauna da microbacia do riacho Cristalina, bacia do rio Dourados, MS

Abstract

The rio Dourados basin is one of the main tributaries of the Ivinhema river basin (upper rio Paraná ). The objective of this work was to carry out an inventory and characterize the ichthyofauna structure of the Cristalina stream microbasin, Dourados river basin. Samples were carried out from July to September 2022, at six points distributed throughout the Cristalina stream microbasin. A total of 557 individuals were sampled, distributed in 26 species, 24 genera, 11 families, and five orders. The orders Characiformes and Siluriformes represented 84.6% of the species composition and the families with the highest richness were Characidae, Heptapteridae, and Loricariidae. The species with the highest occurrence were Piabarchus stramineus and Astyanax lacustris. Point P6 had the highest species richness, abundance, and biomass. The greatest diversity was found at points P1, P3, and P4. This is the first ichthyofauna survey of the Cristalina stream microbasin, containing relevant information for future studies on distribution, biology, and ecology of the species.