Evidence of reproductive disturbance in Astyanax lacustris (Teleostei: Characiformes) from the Doce River after the collapse of the Fundão Dam in Mariana, Brazil

• Published in: Environmental science and pollution research international Vol. 28; no. 47; pp. 66643 - 66655
• Main Authors: Merçon, Julia, Silva Cabral, Dandara, Chisté Teixeira, Bárbara, Miura Pereira, Tatiana, Magalhães Bona, Alliny, Valadares Locateli Armini, Catharina, do Nascimento Agostinho, Silvia Gabriela, Carvalho Gomes, Levy
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-12-2021; Springer Nature B.V
• Subjects: Aquatic Pollution; Astyanax lacustris; Atmospheric Protection/Air Quality Control/Air Pollution; Damage; Dumping; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental science; Females; Gonads; Heavy metals; Iron ores; Latency; Males; Mine tailings; Research Article; Rivers; Spawning; Waste Water Technology; Water Management; Water pollution; Water Pollution Control; Brazil; Lambari; Spawning; Metals; Contamination; Bioconcentration; Histological damage
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-021-15238-x

The Fundão Dam collapsed, on November 5th, 2015, dumping more than 50 million/m
3
of iron ore tailings, enriched with metals, into the Doce River channel. The objective of this study was to evaluate the reproductive biology and histological damage in
Astyanax lacustris
specimens exposed to the metals from the dam collapse. The study was carried out at Doce River, in Espírito Santo State, Brazil. Monthly samplings were carried out for a year.
Astyanax lacustris
had multiple spawning: females’ reproductive peak was in September, October, November, and December; and males between September, October, January, and February. There was a latency in the formation of gonads. For male gonads, it was necessary a 6 cm growth for it to increase from 30 to 50% and 4 cm for female gonads to increase from 40 to 50%. There is a positive correlation between gonad’s concentration of Al and Fe and the rate of histological damage in females. Male gonads had a high rate of immature cells invading the cell lumen (47.36%) and female gonads showed a higher frequency of atresia (39.64%). Fish exposed to the contaminated water showed moderate-high gonad histological damage. The observed changes can directly influence the organism’s development and reproduction in the long run, thus affecting
A. lacustris
population present in the region.