Abstract:
The ultimate aim of this study is to predict how genomic of aquatic organisms
respond to heavy metal exposure. Nile/ Red tilapia fingerlings siblings ( Oroechromis
niloticus) (2.5 cm ± 0.5) were exposed to lead (Pb2+). The study was conducted into 3
parts whereby each part is interrelated. The first part was the lead acute toxicity test.
Using probit method (computer program), the 96--h LC50 value for tilapia fingerlings was
2. 7313 ppm. This value was then used to design a sub-lethal concentration (2. 7313 ppm,
2.0484 ppm, 1.3656 ppm, 0.6828 ppm and O ppm), by which the fishes were exposed to a
period of 30 days. At the end of each 10 days, 3 fishes were killed.
