Scientific knowledge on threatened species of the Brazilian Red List: freshwater fish as a case study

We conducted a bibliometric analysis in order to quantify and characterize the scientific knowledge about threatened freshwater fish species in Brazil based in studies published in peer-reviewed journals from Web of Science database from Clarivate Analytics. We verified an increase in the number of papers for threatened freshwater fish species in Brazil, especially in the last eleven years of studied period. The journals with the most papers were Neotropical Ichthyology, Environmental Biology of Fishes, and Journal of Fish Biology. The number of publications among the Brazilian regions and states is not homogeneous. The most studied threatened fish was piracanjuba Brycon orbignyanus. Some important gaps in scientific knowledge need to be addressed, such as the relatively small number and/or lack of studies conducted Brazilian states and with threatened freshwater fish species in Brazil.