Data/hora: 06/06/2024 05:22:16

Provedor de dados: | 83
País: | Brazil
Título: | Survival, growth and metabolic parameters of silver catfish, Rhamdia quelen, juveniles exposed to different waterborne nitrite levels
Autores: | Lima,Ronaldo L. de; Braun,Neiva; Kochhann,Daiani; Lazzari,Rafael; Radünz Neto,João; Moraes,Bibiana S.; Loro,Vania L.; Baldisserotto,Bernardo.
Data: | 2011-03-01
Ano: | 2011
Palavras-chave: | Nitrogenous compound; Jundiá; Glucose; Lactate.
Resumo: | High nitrite (NO2-) levels may develop in aquaculture systems due to high fish density, but studies of lethal concentration values and the effect of NO2- on metabolic parameters and growth are scarce. Consequently, in this study was verified the lethal concentration at 96 h (LC50-96h) for (NO2-) in juvenile silver catfish, Rhamdia quelen and the effect of four waterborne NO2- concentrations (0.06, 0.46, 1.19, and 1.52 mg.L-1) on growth, and hepatic and muscular lactate, glucose, glycogen and protein. Nitrite LC50-96h was 20.46 (confidence interval: 16.10-23.68) mg.L-1. In the growth experiment, exposure to NO2- did not affect weight, length or specific growth rate, but due to mortality (66.7% and 100% after 20 and 40 days, respectively), biomass of juveniles exposed to 1.52 mg.L-1 NO2- was significantly lower than the biomass of juveniles exposed to other treatments. Therefore, the safe level of nitrite for growth of silver catfish juveniles is below 1.19 mg.L-1 (2% of LC50-96h). Exposure of silver catfish to NO2- for 40 days reduced lactate levels in muscle, but lactate levels increased in liver tissue of fish maintained at 1.19 mg.L-1 NO2-. In addition, glucose levels in muscle and liver tissues were significantly lower in silver catfish exposed to the highest NO2- level. These results indicate that chronic NO2- exposure causes anaerobic substrate oxidation to meet energy demand.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000100013
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/S1679-62252011005000004
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.9 n.1 2011
Fonte: | info:eu-repo/semantics/openAccess