Main components analysis and comparative characteristics of female rainbow trout of three different breeds

The purpose of the study is to conduct a comparative characteristic of the productive indicators of the female rainbow trout of three different breeds and to analyse the main components (PCA). The work was carried out on the basis of the federal selection and genetic center of fish farming in the Leningrad Region. The object of the study was the female rainbow trout of the following breeds: ropshinskaya zolotaya, rofor, rostal. Individuals of four years of age were taken for research. The size and weight indicators of 18 females (mass, Smith length, length to the end of the scaly cover, head length, body height, body thickness) were taken from each breed. Measurements were performed at a time during the spawning appraisal. As a result, it was revealed that females of the ropshinskaya zolotaya rainbow trout significantly exceed other breeds in terms of biomass(2051.4±314.0) with a significant p-value = 0.001 and this characteristic is the most variable (Cv – 15.3 %). Minimal differences are in breed thickness. The main component analysis was carried out in the Rstudio interpreter using GGally and ggbiplot. libraries. The connection of the initial indicators with the main components is revealed. An indicator of body thickness is associated with the second main component, it also has the greatest dependence on this indicator. Among the indicators: the length of the head, the length of the body in Smith and the length of the scaly cover – the correlation is positive, the connection of these signs is strong. And the correlation of these lengths with indicators of the thickness of the body and the height of the body is minimal. The correlation between signs of body height and length to the end of the scaly cover is minimal.