EFFECT OF THE GENETIC STATUS OF OREOCHROMIS NILOTICUS AND O. AUREUS FROM THREE LOCALITIES ON THE MALE RATIO OF THEIR HYBRIDS

EFFECT OF THE GENETIC STATUS OF OREOCHROMIS

NILOTICUS AND O. AUREUS FROM THREE LOCALITIES

ON THE MALE RATIO OF THEIR HYBRIDS

BY
, E. A. BADA WY* AND E. H. RIZKALLA
*National Ins~itute of Oceanography & Fisheries, Genetic lab; Barrage station;
Dakahlia; Egypt.
Key Words: Genetics, Fish genetics, Cichlid fish.
ABSTRACT
Comparative electrophoretical studies for muscle proteines of two
groups of female Oreochromis niloticus from Abbasa hatchery (1′) and
from ponds (F)I a male group ofO. aureus from a drain in the area and
their hybrids were carried out. The study showed thatfemales of O.
niloticus from Abbassa hatchery are more genetically pure than those
from the farm ponds, but the males of O. aureus from the drain were
the lowest ones. This was clearly reflected in the male ratios oftheir
produced hybrids. The male ratio was 84.2% for the 1st hybrid H1 (0.
niloticus QT X O. aureus aD) and 79.8%for the and hybrid H2 (0.
niloticus 9F X O. aureus OD).