here; which may be ascribed to the nature of the water, its slow course, and the sliminess of the ground. The Siberian omul (Salmo autumnalis), found in the Jenisei, Angara, Baikal, Tubal; and the lake Mad∣shour, is not seen here, though it is common in the frozen sea; nor is the little trout (Salmo eriox), abun∣dantly caught on the Jugrian coast, and on the river Petschora, to be found in the river Ob; but the stur∣geon, and huso, who like a soft ground, are larger, and more abundant, yet of a worse taste in the Ob, than in such rivers as are stony.
The fishes of passage peculiar to the Ob, and seen no where else, are, the muksun (Salmo lavareto affinis), the soroch (Salmo wimba), the nelma, large quabs, pike, perch, shad, and barbel. The muksun, nelma, and some others, crowd up the Ob in spring, as soon as the ice is dissolved, reach Beresowa about June, and then proceed further into the Jenisei and Tom; but, in September, chiefly return into the ocean, before the river-water, under the ice, begins to stink. This dis∣agreeable change of water, only happens in little, slow-flowing rivers; not in the larger ones, in the district of Beresowa, nor even in the Ob, after the month of December. Some rivers, which flow from the moun∣tains into the Ob, and have strong and rapid streams, as the Sob, and others, are free from this defect; and, of course, are fuller of fish in winter-time. But, in the Ob, fish commonly live in such places, where the sweet