Physiological response of juvenile rainbow trout to chronic low level exposures of waterborne silver.
Comp Biochem Physiol C Pharmacol Toxicol Endocrinol
; 119(2): 131-7, 1998 Feb.
Article
em En
| MEDLINE
| ID: mdl-9669081
The physiological effects of chronic exposure to AgNO3 in moderately hard freshwater were investigated in juvenile rainbow trout (Oncorhynchus mykiss Walbaum). Two separate 28-day exposures were performed at silver concentrations of 0.5 and 2.0 micrograms/L in flowing Hamilton dechlorinated tap water. Exposure to 0.5 microgram/L Ag resulted in a slight increase (approximately 14.9%) in food consumption, whereas growth rates remained unaltered. Both plasma Na+ and Cl- levels were significantly decreased by 11.8% and 9.3%, respectively at day 16 of the exposure. Hepatic Ag concentrations were elevated approximately 4-fold in 0.5 microgram/L Ag-exposed fish. However, no significant increases in liver metallothionein (MT) concentrations were noted. No mortalities were observed during this 28-day exposure. In comparison, chronic exposure to 2.0 micrograms/L Ag resulted in a 28.8% decrease in food consumption and a 43.0% reduction in growth rate. Plasma [Na+] was decreased by 18.3%, whereas plasma [Cl-] was reduced by 12.2% at day 7. At both concentrations of silver, plasma ion concentrations appeared to recover thereafter. Silver accumulated steadily in the liver up until day 15 when concentrations were 39.7 micrograms/g wet weight (285-fold increase) above control levels. In addition, MT levels were increased by 81.2% at day 7. Silver exposure at 2.0 micrograms/L resulted in approximately 15.0% mortality over the 28-day period.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Nitrato de Prata
/
Oncorhynchus mykiss
Limite:
Animals
Idioma:
En
Revista:
Comp Biochem Physiol C Pharmacol Toxicol Endocrinol
Assunto da revista:
ENDOCRINOLOGIA
/
FARMACOLOGIA
/
TOXICOLOGIA
Ano de publicação:
1998
Tipo de documento:
Article
País de afiliação:
Canadá