Abstract :
[en] The gonadosomatic index at spawning, absolute
fecundity, and egg size for the female sexual products
as well as the density and consistency of semen for the
male sexual products were examined in cultured Abramis
brama 9 Blicca bjoerkna F1 hybrids and compared with
the parental species at their first sexual maturity. Females
ovulated under environmental conditions, and their eggs
were weighed, counted and measured. Semen of males was
macroscopically examined and spermatozoa counted using
a hemocytometer. Results revealed that hybridization
affected the quality of female and male gametes but with
an overlap between hybrids and parents. The gonadosomatic
index and fecundity were significantly lower than
those of parental species. Egg sizes in hybrids showed a
parental effect but to the benefit of hybrids. Semen of
hybrids was more diluted which was classified into two
groups: the white semen overlapping slightly with parents
and the aqueous without any overlap with parents. Overlapped
areas between hybrids and parents in term of quality
of sexual products could translate that females and males of
these hybrids have the biological capacity to produce high
quality gametes and thus, a greater chance to produce F2
and backcross generations in rivers.
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