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Physiological effects of dietary silver sulfide exposure in rainbow trout
Author(s) -
Galvez Fernando,
Wood Chris M.
Publication year - 1999
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620180111
Subject(s) - rainbow trout , gill , zoology , palatability , juvenile , toxicity , chemistry , biology , toxicology , food science , fish <actinopterygii> , ecology , fishery , organic chemistry
Silver accumulation was examined in juvenile rainbow trout during a 58‐d feeding study with silver sulfide (Ag 2 S) added to the diet at concentrations ranging from 0 to 3,000 mg/kg Ag. Silver in the livers of fish fed the 3,000‐mg/kg diet reached a level approximately fourfold higher than the control, representing an initial accumulation rate of 9.5 ng/(g·d). Despite this increase in silver levels in the liver, no influence of liver copper levels was observed. In comparison, there were no significant elevations in silver burdens in the kidneys, gills, or intestines, apart from a transient increase in the gills of fish fed the 3,000‐mg/kg Ag diet on day 24 only. Daily food consumption rates were lowered by 14 to 22% in all the Ag 2 S treatments relative to control levels, possibly because of the decreased palatability of the Ag‐laden diets. However, there were no significant differences in growth rates between any of the treatments for the duration of the study, suggesting a lack of any physiological perturbation by dietary Ag 2 S exposure. The results of this study suggest that dietary silver sulfide exposure at or below 3,000 mg/kg Ag is physiologically benign over a 58‐d period.