EFFECTS OF CHRONIC EXPOSURES TO COPPER ON PRODUCTIOlf AKD TOTAL RESIDES AKOlfG TILAPIA SPECIES.

EFFECTS OF CHRONIC EXPOSURES TO COPPER ON PRODUCTIOlf AKD TOTAL RESIDES AKOlfG
TILAPIA SPECIES.
By
A.A. DRAZ-; I.A. SAMAHA; M.M. EI-TELBANY AKD A.I. IL-SARKA.
* Dept. of Microbiology and Animal hygiene.Faculty of Vet. Med.
Alexandria University.
Key Nards: Copper Pollution, Tilapia species, Chronic Exposure.
ABSTRACT
Two Oreochromis species and one tilapia named Oreochramis
galilaeus, Oreochromis nilQticu~ and Tilapia 1il1ii respectively, were
subjected to chronic sublethal dose of copper sulphate (0.25 ppm).
Along three months, growth in body weights and body lengths were
recorded, at the end the dorsal muscles of the fishes under research
were examined for copper residues. The obtained results revealed
that, there were a significant differences in the final body weight
and body length between treated and non treated species, the highest
final body weight and length were (90.3 ±7.9, 18.5 ! 3.9) in case of
non treated Qreochramds niloticus compared to (78.3 ±7.9, 17.5 ! 3.9)
in case of treated Oreocb!omi~ ni19!ig~. On the other hand the
lowest final body weight and body length were (44.2 ! 7.5, 13.3 ! 3.0)
and (49.0 ± 6.7, 14.1 ! 2.9) in case of treated and non treated T.ilapi~ lil1t~ respectively. Data about estimated total residues
revealed that there were a significant differences at (P < 0.01) among different species, treatment and the control as well as among species and treatment interaction. The highest LSM SE was 0.4390 ! 0.3626 in case of Tila~ ~lli~ and the lowest was 0.2100 ± 0.1251 in case of Qr~Q~h~qmi~ niloti~~. Significant differences was found between treated and non-treated replicates (0.4742 + 0.2137) and (0.0357 + 0.0183) respectively.