ارزیابی ماهیان مولد ماده کپور نقره ای برای اصلاح نژاد

In order to estimation of best bloodstocks of Silver carp for selection breeding, biometery and reproductive measurement were conducted on 186 of females spawners. Amongst it, 9 spawners were selected for next studies. The measured parameters were contained such as total length, standard length, body weight, Fulton’s index, body height and ratio of thickness, length of head and age. After artificial insemination of bloodstocks, the characteristics of eggs and incubation phases, the ovary weight. working and relation fecundity the number of hatched eggs and resulted larvae were studied. Each spawners were separately expended all stages of artificial propagation. For measuring the condition factor of fingerlings the resulted larvae had grown in separate earthem ponds. In attention to available data for favourable spawners in the ages of 5+ , 6+ 7+ the survey was conducted on these 3 age categories which respectively had a Fulton’s index of k <2.2 , k <2 , 2< K <2.2 . The spawners with Folton’s index more than 2.2 had preference in healthy and survival rate and other factors which ordinaly is selected for good female spawners.