HATCHERY AND GROWTH PERFORMANCE OF TWO TROUT PURE BREEDS, SALVELINUS ALPINUS
AND SALMO TRUTTA FARIO, AND THEIR HYBRID
S. Aras-Hisar, T. Yanik, O. Hisar-2003
The
Israeli Journal of Aquaculture – Bamidgeh, 55(3): 154-159
Abstract:
An allelic cross between Salmo trutta
fario and Salvelinus alpinus was carried out under controlled
hatchery conditions. Survival to the eyed stage was significantly lower for
the hybrid than for both purebreds. There were significant differences in
survival in the eyed and yolk sac stages and from fertilization to the first
feeding (p<0.05) between the hybrid and the purebreds, while the
differences between the purebreds were not significant (p>0.05). The
hybrid did not display heterosis with respect to any hatchery property.
During the first 45 days of nursing, there were significant differences
between the purebreds and the hybrid in terms of weight gain, survival, feed
conversion ratio and specific growth rate (p<0.05) with no significant
differences between the purebreds (p>0.05). The hybrid was slightly
heterotic (+1.69) with respect to survival however no heterosis was observed
in any other property to the first feeding stage.
(Fisheries
Department, Agricultural Faculty, Atatürk University, Erzurum 25240,
Turkey, e-mail of T. Yanik: talatyanik@yahoo.com)