The effects of short-term acute cadmium exposure on blue tilapia,Oreochromis aureus

Abstract

SynopsisDisease-free blue tilapia, Oreochromis aureus, exposed to cadmium (OSppm and 10ppm) showed very significant and dramatic decrease in food consumptions. Food consumptions returned to near normal 21 days after fish were returned to cadmium-free water. Along with anorexia there were decreases in body weights during the period when fish were exposed to cadmium. Fish in cadmium-free water that were pair-fed to cadmium-exposed fish (0.5 ppm) did not gain weight but there were no decreases in body weights. Cadmium was still in tissues 34 days after the fish were placed in cadmium-free water and the accumulation was highest in the kidney; this was followed by liver, brain, gill filaments and muscles. The accumulations of the heavy metal (in kidneys and gills) were significantly higher in fish exposed to high than low cadmium levels. There were no differences in complement levels (haemolytic acitivity) in cadmium-exposed and cadmium-free fish. However, cadmium-exposed fish did not produce detectable haemagglutinating antibodies against sheep red blood cells while cadmium-free fish responded well to the antigen. The anorexia in cadmium-exposed fish contributed to the depression in antibody production

Cu Accumulation and Elimination in the Tissues of the Olive Flounder Paralichthys olivaceus

“…Growth parameters were calculated as follows: specific growth rate (SGR)=100×[{1n(end mass)−ln(start mass)}/time]; liver somatic index (LSI)=(liver weight/body ed by several factors, including time, temperature, interacting agents, fish age, fish metabolic activity, and the biological halflife of the metal (Larsson et al, 1985;Douben, 1989;Woo et al, 1993;Heath, 1995;Kargin, 1996;Nielsen and Andersen, 1996). Metal elimination studies are important in terms of fish health, as they help to determine the self-cleansing ability of contaminated organisms and to assess the biological half-life for various metallic contaminants.…”

Effects of Dietary Cadmium and Its Bioconcentration in Tilapia Oreochromis niloticus

“…The kidney is the organ most sensitive to the toxic e!ects of cadmium (Woo et al, 1993). Excessive exposure to cadmium will produce consistent proteinuria, and proteinuria appears to be the most sensitive indication of the renal toxicity (Nicholson et al, 1983).…”

Effects of cadmium on foraging behaviour of lake charr, Salvelinus namaycush

“…Published literature on the effect of Cd on fish feeding is rare. Woo et al (1993) showed that the short-term effect of Cd is reduced pelleted food intake in blue tilapia, Oreochromis aureus.…”