title: [Life cycle of Proteocephalus neglectus (Cestoda) from rainbow trout Salmo gairdneri].
abstract: Proteocephalus neglectus is described for the first time in the G.D.R. from Salmo gairdneri. The incidence of invasion was 65% and the main intensity was 2.8 with a maximum of 6 worms per fish. P. neglectus has a 2-host life-cycle. Copepods of the Cyclops strenuus-group and Cyclops furcifer were used as experimental intermediate hosts. The ontogenetic stages oncosphaera (free-living first larva), cercoscolex (second larva in the copepod haemocoel) and preadult (in the gut lumen of the definitive host) were described and compared with other proteocephalid life-cycles. When copepods invaded by oncosphaeres and captured at 14-15 degrees C were eaten by the trouts after 21 days the invasion of the definitive host took place. Parallel tests with Perca fluviatilis were not successful. A transfer of the preadult worms from trout to trout was possible. Some problems of species determination and of terminology were discussed.
mesh_terms: D000818:Animals; D002589:Cestoda / Q000033:anatomy & histology / Q000254:growth & development*; D003445:Crustacea / Q000469:parasitology; D005393:Fish Diseases / Q000469:parasitology*; D006790:Host-Parasite Interactions; D007422:Intestines / Q000469:parasitology; D012487:Salmonidae / Q000469:parasitology*; D014337:Trout / Q000469:parasitology*
vernacular_title: Zum Lebenszyklus von Proteocephalus neglectus (Cestoda) aus Regenbogenforellen Salmo gairdneri.