Identification of Diplostomum spp. in the retina of perch Perca fluviatilis and the lens of roach Rutilus rutilus from the Baltic Sea — an experimental study
- 1) Department of Zoology, Box 561, S-751 22, Uppsala, Sweden
- 2) Marine Section, The National Environmental Protection Agency, Box 584, S-740 71, Öregrund, Sweden
Metacercariae of the genus Diplostomum dwelling in the retina of perch Perca fluviatilis and the lens of roach Rutilus rutilus were identified on the basis of adults obtained by feeding various piscivorous birds of the families Laridae, Anatidae and Phasianidae with metacercariae on an experimental basis. Both morphological studies of the metacercariae and adults obtained from the intestine of the infected birds, as well as the suitability in these hosts, indicated that we were dealing with two different species of Diplostomum. The perch form was recognised as D. baeri Dubois, 1937. Although metacercariae of this species matured both in herring gull Larus argentatus and common tern Sterna hirundo, the principal final host seemed to be goosanders Mergus merganser. In contrast, the lens form in roach was identified as D. spathaceum (Rudolphi, 1819) and it seemed to be restricted to birds of the family Laridae. These experimental results agree with parasitological findings from birds infected in the wild.
- 1 - sciences appliquees, technologies et medecines
- 2 - sciences biologiques et medicales
- 3 - sciences biologiques fondamentales et appliquees. psychologie
- 4 - ecologie animale, vegetale et microbienne