[The morphological variability of a population of Proteocephalus percae (Cestoda: Proteocephalidea) in Lake Rindozero].

The morphology of the cestode Proteocephalus percae, a typical parasite of Perca fluviatilis, from Lake Rindozero has been studied. The variability of 8 age groupings has been revealed and the connection of their morphological parameters with the specificity of host-parasite relationships at different developmental stages of the population has been shown.