[An assessment of the opisthorchiasis situation in the area of Irtysh-Karaganda Canal].

Helminthological investigation of the Irtysh-Karaganda Canal area was performed in the summer of 1989. In 9 storage ponds on the Shiderta and Olenta rivers 900 fish individuals, whose size was suitable for fishery have been examined, samples of water have been taken and the epidemiological assessment of modern conditions of opisthorchiasis agent circulation have been presented. The whole canal is at present favourable in view of opisthorchiasis infection.

[Intermediate host of the trematode Quinqueserialis quinqueserialis (Trematoda, Notocotylidae) in the USSR and the morphology of its parthenitae and larvae].

A high infection rate of muskrat with the trematode Q. quinqueserialis was recorded in Pribaikalje. Its intermediate host is the mollusc Gyraulus (Anisus) stroemi.

[Life cycle of Psilotrema simillimum (Mühling, 1898) (Trematoda: Psilostomidae)].

Psilotrema simillimum has one intermediate host, the mollusk Bithynia leachi. Cercariae emerging from the mollusk encyst in the environment. Adolescariae become infectious in 3-7 days.