Growth, feeding, and protein synthesis (ks) and degradation (kd) in gill, liver, and whole body were measured in juvenile rainbow trout, Oncorhynchus mykiss, during 32 days exposure to sublethal acid (pH 5.2) and acid + aluminum (Al) (30 μg·L-1) in soft water. The only effects observed for exposure to acid alone were depressions of gill ks (17%) and kd (27%) after 15 days (data not available after day 15). Exposure to acid + Al caused a loss of appetite, a 73% reduction in whole body growth rate, and a 36% reduction in whole body ks during the first 7 days; all of these subsequently recovered, although mean body weight was still significantly depressed after 32 days. Gill ks and kd were greatly stimulated after 7 days and gill ks remained elevated after 32 days, suggesting a chronic cost of gill repair and (or) acclimatory processes even after physiological recovery was achieved. However, this elevated cost was small relative to the whole animal protein synthesis budget. Other chronic effects included suppressed liver ks and kd, reduced whole body translational efficiency, and enlarged liver size. Conversion of food into growth was paradoxically increased throughout all stages of acid + Al exposure but may have been the result of reduced routine activity.
|Original language||English (US)|
|Number of pages||10|
|Journal||Canadian Journal of Fisheries and Aquatic Sciences|
|State||Published - Jan 1 1996|
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
- Aquatic Science