Dependence of morphological features of carp Cyprinus carpio (L.) on its resistance to the influence of unfavorable environmental conditions
The changeability character of familial carp groups (Cyprinus carpio) has been studied from the perspective of resistance to stress impacts within the larvae stage of fish development as well as the changeability between the groups by morphotype in the first year of fish life. The stress resistant fish groups show better productivity characteristics at pond rearing and considerable differences by plasticity indices complex compared to sensitive fish families. As a characteristic of a progeny’s morphotype, the indices such as: the relation of body measurements to the common length of one-summer-olds and measurements of the head section to the head length were used. The discrimination analysis of one-summer-olds carp samples shows that in the canonical space, all families investigated form slightly crossing factor ranges. Moreover the resistant fish groups are the most distant from the sensitive group and the control one. Investigations of carp generations viability at oxygen deficit in the age of one-summer-old showed morphotype differences for fishes resistant and sensitive to hypoxia. On the grounds of studies on conjugated variability of morphometric indices complex as well as on resistance to hypoxia in the first year of carp life, the relationship has been determined between familial fish groups characteristics and viability of fishes in the larval development stage.