TilE VIABILITY DEGREE OF 15 DIFFERENT KINDS OF HvnRIDS PRODUCED BY PAIRING GAMETES FROM COMMON CARP, CIlfNESE CARP AND TENCH.

TilE VIABILITY DEGREE OF 15 DIFFERENT KINDS OF HvnRIDS

PRODUCED BY PAIRING GAMETES FROM COMMON CARP,

CIlfNESE CARP AND TENCH.

l\IAGDA I. ZAKI, MOHAMED A. ISSA, A.K. SOLIMAN· AND
l\1.A. KOSBA·.
National Institute of Oceanography and Fisheries. Alexandria. Egypt.
*Faculty of Agriculture. Alexandria University.
ABSTRACT
Fertilization and hatching rates of the
pure line species of common carp Cyprinus
carpio; big head carp Arlstlchthys nobills;
grass carp Clenopharyngodon·· lde11.; silver
carp Hypophtha’.lchthys .ol1trlx; tench TInea
tlnc. and their different combination crosses
were detennlned In addition to the heterosis
values of these parameters.
No vi able embryos produced from
hybridization of males commom carp with females
bighead; grass; silver carp and tench. The
cross breeds of common carp females with
bighead; grass; silver carp; and tench males
showed significant lowering In the
.fertllization and hatching rates when compared
with the pure line specfes. Cross-breeds
of female bighead x silver carp male; female
silver carp x bighead carp male; female grass
carp x bighead male and female common carp
x silver carp male exhibited better value
for these parameter. Concerning the males
of silver carp and bighead carp showed specific
combining ability In fertilization and hatching
rates when crossed with females common carp
or grass carp.