Home – Home – Jornals – Contemporary Problems of Ecology 2008 number 1

Changes in the phenetic diversity of the population of East-Siberian grayling Thymallus arcticus pallasii Valenciennes, 1848 from the Buyunda river (the upper Kolyma) depending on the sex and age of individuals are analyzed. Among 16 phenes of the coloring of grayling dorsal fin in Eurasia four ones were detected on the dorsal fin of the East-Siberian subspecies. Fish of advanced age have a larger number of webs with the long-strip phene in comparison with younger fish, mainly webs without patterns or with patterns in the form of spots and short strips are present. Statistically significant differences between female and male individuals in the frequencies of the two phenes of four were detected. Variability of patterns in connection with fish growth should be taken into account when describing the habitus of grayling.