title: [Prevalence of Cystobranchus fasciatus (Kollar) (Hirudinea) in the Biebrza River].
mesh_terms: D000818:Animals; D005618:Fresh Water; D007865:Leeches / Q000033:anatomy & histology / Q000302:isolation & purification*; D011044:Poland
vernacular_title: Wystepowanie Cystobranchus fasciatus (Kollar) (Hirudinea) w rzece Biebrzy.