Evidence of cytogenetic and histological damage in specimens of Astyanax lacustris (Pisces, Characidae) exposed to the hydrogen cyanide-based herbicide Dormex®

• DOI: 10.4025/actascibiolsci.v43i1.51425
• Publication Date: 2021-04-14T18:59:32Z
• Authors: Layon Zafra-Lemos; Vera Lúcia Lopes; Ana Paula de Sant...; Maria Raquel Març...; Luciana Andreia B...; Ana Luiza Brito P...
• Keywords: Characidae; Mitotic index

The herbicide Dormex®, a solution of hydrogen cyanamide, is growth regulator capable breaking the dormancy fruit plants, and commonly applied in agriculture. However, biological effects this product on non-target organisms are unknown. present study investigated response Astyanax lacustris (Lütken, 1875) specimens exposed to Dormex® using chromosome aberration test, mitotic index, histological analysis gills. Forty were obtained from local breeding facility divided into 10 groups (nine experimental one control) with four fish each aquarium (group). control group was maintained for 24 hours dechlorinated water while allocated nine different treatments, three concentrations 0.05, 0.1 0.5 mL L-1, exposure 24, 48 72 hours. presented chromosomal aberrations number types, including breaks, acentric fragments, decondensation, gaps at concentrations, all times. index decreased significantly comparison group. preparations gills revealed alterations such as hyperplasia, lamellar fusion edema, whereas structure preserved. cytogenetic genotoxic potential morphological demonstrated sensitivity fish, which responded rapidly stressor. These findings reinforce need special care restrictions use these herbicides agricultural areas located near aquatic environments.