This study presents the parasitical relationships between the leech Piscicola respirans and European grayling Thymallus thymallus. It determines leech invasion intensity and extensity as well as describes the preferences of fin selection by the parasite as a place to attach and feed. It also shows the significance of fin selection by the leech in the initial phase of life cycle. Finally, the study defines P. Most probably the host-searching mechanism is based on positive phototaxis.
Seryjne morderstwa z Ipswich – Wikipedia, wolna encyklopedia
B Corresponding author. Email: lidia. The feeding habits of spirlin Alburnoides bipunctatus were investigated in a tributary of the River Vistula Poland. There was a significant ontogenetic shift in the feeding pattern among size classes, marked by differences in the proportion of the main taxonomic groups of prey consumed: small spirlin primarily consumed chironomid larvae, whereas medium and large spirlin showed a preference for Coleoptera, Ephemeroptera and imagines of unidentified insects.
The reproductive activity of females of the Chinese pond mussel Sinanodonta woodiana was investigated in a European population inhabiting cooling water. The study used histological and stereological methods to determine gonad structure, changes in reproductive follicles during gametogenesis, oocyte development, glochidia structure, and brooding periods. Ovaries in mussels were formed by reproductive follicles.
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