During parasitological research of fishes in Lake Superior (USA) in August - September 1994, infection with trypanosomes of the blood of sculpins (Cottas ricei and C. cognatus) was recorded for the first time. The descriptions of three morphological groups of the genus Trypanosoma: T. sp. I, found in blood of C. ricei, T. sp. II and T. sp. Ill from blood of C. cognatus, have been provided.
A new species of marine fish leeches is described and compared with its congeners. Oceanobdella sakhalinica possesses a unique combination of characters: the anterior sucker is small; one of posterior transverse bands on the urosome is very dark; a wedge-shaped patch is located on the posterior sucker; posterior crop caeca are separate for their entire length; accessory glands on the atrium are lacking; five pairs of testisacs are present; the copulatory area and the conductive tissue are lacking. Hosts include a sculpin Myoxocephalus sp. and the blackline prickleback Acantholumpenus mackayi. The leeches were collected in Aniva Bay, southern Sakhalin.
Description of 5 new species of Myxosporea parasites found in sculpins of families Cottidae and Psychrolutidae at the north-western coast of the Japan Sea. Three of them were found in gall bladder (two species of genus Sphaeromyxa and one species of genus Ceratomyxa), and two others - in urine bladder (one species of genus Davisia and one species of genus Schulmania). Differences between the newfound species and similar species described in literature are discussed.