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Micropollutants impair the survival of Oreochromis niloticus and threat local species from Iguaçu River, Southern of Brazil

2021; Elsevier BV; Volume: 83; Linguagem: Inglês

10.1016/j.etap.2021.103596

1872-7077

Satar Luciano Gemusse, Nilce Mary Turcatti Folle, Angie Thaisa da Costa Souza, Maristela Azevedo-Linhares, Francisco Filipak Neto, Cláudia Feijó Ortolani-Machado, Juan Ramón Esquivel Garcia, Luíse Esquivel, Cleber Pinto da Silva, Sandro Xavier de Campos, César C. Martins, Ciro Alberto de Oliveira Ribeiro,

Reproductive biology and impacts on aquatic species

The wastewater contamination of urban rivers is a concern for biodiversity and a consequence from poor urban conservation policies. In the current study, the impact of urban and industrial activities was investigated in Iguaçu river (Southern Brazil) using juvenile Oreochromis niloticus, after trophic and chronic exposure (25, 50 and 100 %), over 81 days. After exposure liver, gills, gonads, brain, muscle, and blood were sampled for chemical, biochemical, histopathological, genotoxic and molecular analyses. Water levels of persistent organic pollutants such as polychlorinated biphenyls, organochlorine pesticides, polycyclic aromatics hydrocarbon (PAHs) and metals were investigated. The redox unbalance, histopathological and increase in vitellogenin expression in fish revealed both the bioavailability of micropollutants and their harmful effects. According to the results, the level of Iguaçu river pollution negatively impacts the health of O. niloticus revealing and highlighting the risk of this pollution exposure to biota and human populations.