Data/hora: 05/06/2024 17:20:52

Biblioteca(s): 	Embrapa Meio Ambiente.	
Data corrente: 	04/11/2020	
Data da última atualização: 	10/06/2022	
Autoria: 	CHISTE, B. M.; TAKESHITA, N. A.; MATIOLLI, C. C.; JONSSON, C. M.; BARIZON, R. R. M.; HISANO, H.	
Afiliação: 	BRUNA MILKE CHISTE; NATALIA AKEMI TAKESHITA, Unifaj; CRISTIANO CAMPOS MATIOLLI, CNPq; CLAUDIO MARTIN JONSSON, CNPMA; ROBSON ROLLAND MONTICELLI BARIZON, CNPMA; HAMILTON HISANO, CNPMA.	
Título: 	Risk assessment and acute toxicological effects of atrazine on Nile tilapia larvae after stress.	
Ano de publicação: 	2020	
Fonte/Imprenta: 	Journal of Environmental Science and Health, Part B, v. 56, n. 1, p. 23-29, 2020.	
ISSN: 	0360-1234	
DOI: 	https://doi.org/10.1080/03601234.2020.1831863	
Idioma: 	Inglês	
Conteúdo: 	Abstract: The present study aimed to evaluate the risk assessment, median lethal concentration LC50-96h, development, and mortality of Nile tilapia Oreochromis niloticus larvae exposed to atrazine after stress management. An LC50-96h trial was carried out using fish (n=147; 8.5±1.0mg; seven larvae/aquarium), which were allocated randomly in 21 aquaria (1L) and exposed to five concentrations of atrazine: 2, 4, 8, 16, and 32mg L-1 plus one control (without herbicide) and a control with a solubility adjuvant (acetone). Temperature, pH, dissolved oxygen, conductivity, and total ammonia were measured daily. In addition, a stress test was performed with fish (n=150; 17.9±1.7mg; 10 larvae/aquarium) submitted to air exposition (five minutes) and posteriorly distributed randomly in 15 aquaria (1L), and exposed to atrazine at 0.18, 6, 12, and 18mg L-1. The LC50-96h of atrazine for Nile tilapia larvae was 17.87mg L-1. Significant differences (P<0.05) were found for weight and final length, pH, and dissolved oxygen that was responsive to the increased levels of herbicide. Larvae mortality post-stress was registered to 6, 12, and 18mg L-1 of atrazine, and was more critical at 24h. The increased doses of atrazine used in LC50-96h test depressed the development of Nile tilapia larvae. Fish submitted to stress (air exposition) and exposed to sub-lethal doses of atrazine showed significant mortality, indicating that stressors may increase the toxic effect of atrazine for Nile tilapia larvae. On the other hand, based on risk assessment atrazine can be classified as herbicide with low toxicity for Nile tilapia larvae and low toxicological risk.	
Thesagro: 	Aquicultura; Herbicida; Impacto Ambiental; Piscicultura; Tilápia.	
Thesaurus Nal: 	Atrazine; Ecotoxicology; Environmental impact; Herbicides; Tilapia (common name).	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Meio Ambiente (CNPMA)	
Exemplares: 	CNPMA - (16846-1) - UPC - AP - DD -  -  -  - DIS