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    Avaliação do risco de invasão de espécies não-nativas e caracterização histopatológica de peixes da Bacia do Alto Tietê SP, Brasil
    (Universidade Federal de São Paulo, 2023-12-13) Valle, Amanda de Azevedo [UNIFESP]; Azevedo, Juliana de Souza [UNIFESP]; http://lattes.cnpq.br/9196997953777495; https://lattes.cnpq.br/4661034322104934
    The introduction of species is a global problem. In the context of aquaculture, introductions into watersheds located in urbanized areas deserve special attention. Although the dangers of this introduction are recognized, there is still a significant lack of studies on invasions in urbanized reservoirs. In this context, this research aimed to assess the risk of invasion by non-native freshwater species in the Alto Tietê Hydrographic Basin (BH-AT), kept in fishing grounds in the extreme south of São Paulo. The risk of invasion was assessed using the Aquatic Species Invasiveness Screening Kit (AS-ISK) software version 2.3, a protocol for deciding on the impact of invasive species. The categorization covers 1) Biogeography/History; 2) Biology/Ecology; and 3) Climate Change, to provide quantitative results. The risk of invasion was categorized in the Basic Risk Assessment (BRA) scenario and the risk scenario associated with Climate Change (BRA+CCA), as follows for the BRA scenario: <1 = low risk of invasion; 1 - 21.9 = medium risk; >21.9 = high risk. In turn, perception data was obtained from interventions in the field, using a semi-structured form and through the collection of secondary bio-ecological data. In addition, the health of the fish was checked through histopathological evaluation of the liver tissue of Oreochromis niloticus, a species commonly found in all fishing grounds in the region. About the invasion potential for the Basic Risk Assessment, medium invasive potential was found for Cyphochrax modestus (BRA = 5), Astyanax fasciatus (BRA = 10), Hypostomus ancistroides (BRA = 18), Geophagus brasiliensis (BRA = 21) and Hoplias malabaricus (BRA = 21) and high invasive potential for Colossoma macropomum (BRA = 22), Rhamdia quelen (BRA = 28), Synbranchus marmoratus (BRA = 28), Piaractus mesopotamicus (BRA = 29), Crenicichla lenticulata (BRA = 31), Oreochromis niloticus (BRA = 31), Pseudoplatystoma fasciatum (BRA = 35), Salminus sp. (BRA = 35), Pseudoplatystoma corruscans (BRA = 37), Copton rendalli (BRA = 37), Cyprinus carpio (BRA = 45) and Clarias gariepinus (BRA = 59). In addition, data indicates that the species cultivated are likely to come from inland farms in the municipalities of São Paulo and Minas Gerais. In this sense, the compilation of data, together with the risk assessment, indicates that the fishing grounds of the BH-AT are potential dispersers of exotic, potentially invasive species.