2003•DergiPark (Istanbul University)Requires access
Incubation and Yolk Sac Periods of Closely Purebred and Reciprocal Hybrids of Erzurum and Silifke Rainbow Trout (Oncorhynchus mykiss)
Namık Mevlüt Aras, Özer Ayık, Esat Mahmut Kocaman, Telat Yanık
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Abstract
Our aim was to investigate the survival rate at the hatching and yolk sac stage of close-rearing and crossbred rainbow trout population (Erzurum female X Erzurum male - EF x EM; Erzurum female X Silifke male - EF x SM; Silifke female X Silifke male - SF x SM; Silifke female X Erzurum male - SF x EM). A total of 32,976 eggs were incubated, 29,012 of which hatched. The survival rate of the larvae was 88%. The insemination rate, brooding yield and hatching rate of EF x EM, EF x SM, SF x SM and SF x EM were 97.33 ± 0.57, 97.66 ± 0.57, 97.33 ± 0.57 and 97.33 ± 0.57; 93.43 ± 1.81, 93.40 ± 1.85, 72.00 ± 33.80, 88.00 ± 9.64, and 95.47 ± 2.052, 94.73 ± 2.65, 73.80 ± 34.66, and 90.17 ± 9.71%, respectively. Although the differences among all determined averages were not significant, the hatching yield was 20% lower for the SF x SM group.