The natural enemy of the blackfish is the Cherokee salmon.

The Cherokee salmon is commonly known as the Sea Emperor, the Folding Dragon, the Water Dragon (Northeast), and the Great Sea Dragon (Xinjiang). Belong to the salmoniform order Salmonidae Cherokee genus, for large carnivorous ferocious fish, adult body length of 2-5 meters, long body, slightly flattened sideways, was cylindrical. The head is flat, with a pointed muzzle, a large mouth cleft, and extremely small scales. For the world's second-class endangered protected animals.

The Cherokee salmon is very voracious and is one of the most ferocious species of freshwater fish. The time to forage is mostly before sunrise and after sunset, from deep water to shallow water to feed on other fish and water activities such as snakes, frogs, rodents and waterfowl, and other time to lurk in the streams on both sides of the shaded water bottom.

Feeding throughout the year, in summer when the water temperature is a little high, appetite is poorer, and even the phenomenon of stop eating; winter does not stop feeding, only the reproductive period to stop feeding.

Distribution of chum salmon

The chum salmon is mostly distributed in the Heilongjiang River, the Tumen River, the Irtysh River and other waterways in China. Overseas distribution in Russia, Siberia, the Lena River to the Bohchowla River, Eastern Europe, the Volga River and the upper Ural River and other rivers.

The resources of Chiloh salmon have not been reported in detail, but according to the "Fishery Resources of Heilongjiang Province" (1985), the number of Chiloh salmon in Heilongjiang Province has decreased significantly compared with the past, and it hardly accounts for a proportion of the catch in the whole province. The significant decline in resources is mainly due to overfishing during the breeding season, which greatly reduces the prey population, and environmental pollution, which destroys the environmental conditions for survival. Effective conservation measures have not yet been developed.