African Journal of Biotechnology Vol. 5 (12), pp. 1284-1287, 16 June 2006   

ISSN 1684–5315 © 2006 Academic Journals        

Full Length Research Paper

Uptake and loss of absorbed dissolved cadmium to Clarias angullaris fingerlings

OBANO, Efosa Emokpae* and ORONSAYE, Jude Aigbokhaevbo Osamuede

Department Of Fisheries, Faculty Of Agriculture, University Of Benin,  P.M.B. 1154, Benin City, Nigeria.

*Corresponding authors E-mail: efeobano2002@yahoo.com.

Accepted 9 May, 2006

The uptake and loss of dissolved cadmium in media by the African mud fish (Clarias angullaris) fingerlings was studied in water of 25 mg/ L hardness, pH 6.8, at 27 ±2°C in a static test system.  The uptake experiments involved exposure of fish to 0.5 and 1.0 mg Cd²⁺/L test solutions from which the fish absorbed and retained 1.1011 mg and 1.3060 mg Cd²⁺/g wet fish weight, approximately 550 and 653 times the recorded normal tissue level, respectively, after 8 days. In the loss experiments, after fourteen (14) days, the fish that had 0.8320 mg Cd²⁺/g wet weight in the 0.5 mg Cd²⁺/L test medium reduced the internal concentration to 0.1121 mg Cd²⁺/g; and in the 1.0 mg Cd²⁺/L test solution, the reduction is from 0.9820 mg Cd²⁺/L to 0.1142 mg Cd²⁺/L wet weight.

Key words: Dissolved cadmium, uptake, loss, Clarias angularis.