| Popis: |
The study of roach for the metazoic parasites' presence allowed to detect D. crucifer, D. chromatophorum. P. homoion homoion, C. laticeps, O. felineus, P. ovatus, R. campanula, I. platycephalus, S. bramae, P. elongatum. R. acus (l.) Unionidae gen. sp E. sieboldi P. geometra Proteocephalus sp. The greatest species diversity was observed in fish in groups 2+, 3+, and 4+ (11, 14, and 13 species of parasites, respectively). At the ages of 1+ and 5+, 8 species of parasitic organisms were found, in the group of 0+ - 6 species of parasites. The greatest parasites' species diversity was noted on the gills - 5 species, in the intestines – 3 species, in the muscles and mesentery - 2 species, in the lens, on the fins, in the kidneys and on the body surface - 1 each. Cluster analysis on the invasion extent of roach parasites aged 0+ - 8+ showed groups 1+ - 4+ merging into one cluster; fish aged 0+, 5+ and 6+-8+ are allocated to a separate cluster. The calculated clustering by IE in age groups shows the similarity of parasite fauna and the magnitude of the invasion extensiveness at the ages from 1+ and 4+, and 6+ - 8+. With age, the biotopic distribution and nutrition spectrum of roach changes, which affects its infestation by parasites and the composition of the parasitic community as a whole. |
