Female Fertility Curve of Rainbow Trout (Oncorhynchus mykiss) by Different Ages

MIREŞAN, Vioara; COCAN, Daniel; RĂDUCU, Camelia; CONSTANTINESCU, Radu; IHUŢ, Andrada
January 2013
Bulletin of the University of Agricultural Sciences & Veterinary;2013, Vol. 70 Issue 1, p15
Academic Journal
Starting from the premise that achieving higher production and economic performance in the salmonid farms is strongly influenced by the processes of artificial breeding, on this study we wanted to highlight the optimal age at which rainbow trout (Oncorhynchus mykiss) females can be used for breeding. For this, where randomly selected from the each growth basins, 20-breeding females by the following age groups: 3, 4, 6, 8 and 10 years. Were determined: body weight of each females, the total number of eggs / female, individual mass of eggs, the diameter of eggs, the volume of eggs, respectively the individual weight of the ovaries. Based on the obtained data, were calculated the following selection and breeding indices: gonado-somatic report (GSr), Behning fertility coefficient (Bfc), respectively Williams absolute individual fecundity index (Waif). In the gonado-somatic report (GSr) was found an increased value from 15.33 ±0.299 at 3 years age, up to a maximum of 17.194±0.366 (at the age of 6 years). For females of 8 and 10 years ages, its found an decreased value from this report (16.267±0.406, respectively 13.070±0.630). For the Williams absolute individual fecundity index (Waif), were obtained increasing values, proportional with age (4.278±0.279 at 3 years, 6.799±0.562 at 10 years). The same aspect has been reported in the case of Behning fertility coefficient (Bfc). Based on evolution of selection and breeding indices values, we recommended in the technological processes the use of rainbow trout females with age between 4 and 8 years.


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