Determination of some dominant genetic characteristics and morpho-meristic features for selection of rainbow trout (Oncorhynchus mykiss) broodstocks

In this study, Iranian and French male and female Oncorhynchus mykiss broodstocks were dividedinto two groups 50 and 24 respectively in Research center of genetic and breeding of coldwaterfishes, Yasouj, Iran and the genetic structure of them was investigated using 6 microsatellitemarkers. Then 19 morphometric and 5 meristic of broodstock were measured and compared intwo populations. Along with broodstock maturation, fertilization 1:1(female:male) were randomlyassigned and occurred in 25 of 12 Iranian and French treatment respectively. Reproductiveparameters were recorded for the whole family. Average number of observed alleles in Iranian andFrench stocks was 6.68 and 6.83, respectively. Average number of effective alleles in Iranian andFrench stocks was 3.13 and 3.45 respectively. Fixation index Fst was calculated based on allelicfrequency between two stocks was 0.058 with significant difference between 2 stocks.Morphometric analysis showed significant difference between two stocks in 8 characteristics.Meristic characters was without significant difference in broodstock groups. Eyed percentage forfrench broodstock calculated zero and deleted. Fertilization rate (100-0), the eyed percentage (98-0), The hatch rate (98-0), the average fecundity 4114.708, the average eggs size 4.88 mm, Survivalin the first three months 19-73% calculated for Iranian broodstocks. Considering the quality ofeggs and larvae at different stages and selection between the different family and the within familyremained 10 treatments and are kept as future broodstocks. The relationship between fecundity -egg size, fecundity - weight , fecundity - length, egg size- weight was performed using regression.The results showed that Fecundity was influenced more by weight and productive length. Theresearch is beginning to ID the broodstock in our country.

PhD

Advisors: A. MatinFar, M. Soltani Consullors: S. Rezvani Gilkolai, A. Kamali