GENE'rlC APPROACH OF RED TlLAPIA

GENE’rlC APPROACH OF RED TlLAPIA
SAFAA I EL-DEEB AND MOHAMED A ESSA
National Institute of Oceanography and Fisheries, Kayet Bay,
Alexandria, Egypt.
ABSTRACT
The electrophoretic analysts of muscle myogen of the
different phenotypes of red tilapia; Oreochr~i. nilottcus
and O. lUreua revealed that myogen petterns were not exactly
similar and specific for each species. On the other hand,
ester••e isozyme patterns show mobtlity differences between
them at Est II and Est III and were used to detect
similartty between the species examtned.
Analysts of variance of fish body wetght, growth and
harve.ting parameters revealed that black Tilapia possessed
a significantly highest growth in weight, while red black
tilapia was tha .econd qne, But O. nlloticus had the pooreat
one ~ich wa. not significantly different with red tit.pta
value. The genetic similarity between BT and RB fs closer,
while the similarity between IT, O. nilQticu. and Rt has the
same value. This result agrees with the result. of food
conver.fon.