The occurrence of abnormalities in Ropshinskaya golden trout

The aim of the study was to monitor young offspring with abnormal growth at the fry stage of growth. The object of the research was the 4th generation of rainbow trout of Ropshinskaya gold breed. The individuals of this breed were bred by the methods of mass selection and family selection. Characteristic features of this breed were good growth rate, high carotenoid content in their meat and attractive appearance. Four year old females and two years old males were taken as producers. In total, 20 pairs of producers were selected with subsequent setting for incubation. The reasons of the wrong growth of juveniles might be different: the immunity reducing, hydrochemical and temperature changes of water, genetic heritability and other unfavorable factors. Abnormal growth may occur both at the larval stage and at more adult state. As an example, the so-called "dropsy" can appear as a concomitant symptom of current disease, and inother cases it can be the consequence of water hydrochemistry changes. However, as a rule, anomalies in the growth of fish to one degree or another cause economic damage to the farm, since they provoke the development of alimentary diseases, often leading to fish mortality. Each colony was individually counted for fry with abnormal ontogenesis at four weeks of age. In the course of the work, six types of abnormal development of fry of rainbow trout were noted: "Siamese" (two-headed individual), dropsy, scoliosis, and other types of curvature of the backbone. The number of "freaks" and their percentage of the eggs laid for the incubation were counted. In the results, it was noted that in two families of the 17 remaining, the percentage and number of individuals with abnormal development was equal to zero.