Wierzbicka J., 1990. Parasitic protozoa of a Greenland halibut Reinhardtius hippoglossoides (Walbaum, 1792). Acta Ichthyol. Piscat. 20 (1): 91-98.
A detailed description of morphology of three protozoan species found in the gall bladder and urinary bladder of the Greenland halibut in given. The fishes were caught in the North Atlantic and the Pacific. Drawings of spores and their dimensions are also given. One of the four found species is described for the first time in the Greenland halibut.