Abstract
This study was carried out to assess the uptake kinetics of two heavy metals lead and cadmium in African catfish juveniles and their ability to depurate during subsequent exposure to clean water. Catfish juveniles with average weight and length of 5.3g and 5.8cm respectively were randomly selected and acclimatized for two weeks. A 24-hour range finding test was carried out. In the definite test, the fish were stocked in 24 tanks containing 5litres of water with lead and cadmium treatment separately labeled according to predetermined concentrations 5, 10, 15, 20, 25 mg for lead and cadmium with 4 fish in each treatment. The water and fish were analyzed for the metals after 5 days to show percentage uptake of the metals from the water. The fish were transferred back into clean water to access the rate of depuration and water was changed continuously. After 4 days the fish were analyzed again to see if they were purged of the heavy metals. Based on these findings catfish have shown to be good accumulators of heavy metals but can be depurated if allowed to swim in clean water. Uptake percentage after the period of exposure to 5mg, 10mg, 15mg, 20mg, 25mg concentrations were 18.68, 10.17, 5.95, 1.41, 8.26 for cadmium and 20.47, 10.17, 8.76, 9.92, 10.08 for lead; Percentage of metals depurated after 4 days were 40.00, 80.70, 90.00, 77.78, 45 for cadmium and 73.045, 20.413, 41.425, 37.580, 61.141 for lead. Lead was readily taken but cadmium was readily depurated.
 Keywords: Heavy metals, juvenile catfish, exposure, uptake and depuration
Highlights
*Corresponding Author Email: bolaji.babatunde@uniport.edu.ng depressed immune system response and kidney and liver diseases (Burger et al, 2007). These metals have no bio-importance in human biochemistry and physiology, but its consumption, even at very low concentration can be toxic (Young, 2005)
This study was carried out to assess the uptake kinetics of two heavy metals lead and cadmium in African catfish juveniles and their ability to depurate during subsequent exposure to clean water
The uptake, depuration, percentage depurated of cadmium and lead after 5 days is shown in the table 2 and figures 2 and 3
Summary
Depressed immune system response and kidney and liver diseases (Burger et al, 2007). These metals have no bio-importance in human biochemistry and physiology, but its consumption, even at very low concentration can be toxic (Young, 2005). Even for metals with bio-importance such as zinc, nickel and chromium (Abduljaleel and Shuhaimi-Othman, 2011), dietary intake has to be maintained at the regulatory limits, as excesses will result in poisoning or toxicity (Young, 2005). This is because they combine with body biomolecules such as metal-binding protein and enzymes to form stable biotic compounds, thereby mutilating their structures and hindering them from performing the designated functions within the body system (Duruibe et al, 2007). This study was carried out to assess the uptake kinetics of two heavy metals lead and cadmium in African catfish juveniles and their ability to depurate during subsequent exposure to clean water
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