THE INFLUENCE OF WATER POLLUTION UPON THE GROWTH PERFORMANCE OF OREQCHROMIS AUREUS (STEINlJ.) IN LAKE MARIUT, EGYPT.

THE INFLUENCE OF WATER POLLUTION UPON THE GROWTH

PERFORMANCE OF OREQCHROMIS AUREUS (STEINlJ.) IN

LAKE MARIUT, EGYPT.

BY
SHNOUDY A. BAKHOUM, AND SAMJR N. FALTAS
National Institute of Oceanography and Fisheries, Alexandria, Egypt.
Key words: Oreochromis aureus, Age, Growth.
ABSTRACT
Lake Mariut is recently sU~iect’ed to intensive pollution. The influence of
this pollution upon the growth pe~formance of Q. aureus was studied. Q.
aureus, capturedfrom non- polluted region grow to 7.7/, /2../5 & /6.20 cm
at the end (?ffirst, second and third year ofl?fe. lhese growth rates are better
tha/l those estimated for fish in polluted region where they attai/l the
correspondi/lg sizes of 7.29, 11.29 & 1./.00 cm. Growth pattern was described
by von BertalGl?ffy growth equation. Its parameters were estimated as K =
0.3893; to = – 0./872 & Loa = 19.69 cmfor polluted region and K = 0.23./3;
to = -0.2./82 & Loa = 30AO cm for nO/l-polluted region. Maximum estimated
age was 12.6& 7.5 yearfor nO/l- polluted and polluted regions re.spectively.
lhe index ofgrowth pelformance estimatedfor fish from non-polluted region
(2.3./) H’as better than thatfrom polluted region (2.18).