Dogfish have spines, but the spines are few.

The dogfish belongs to the Salmoniformes, Dogfish family, Dogfish genus. I.e. black spotted dogfish. Common name: dogfish, duckfish. English name: Pikes , Amur pikc . The dogfish is a widely distributed freshwater fish in the northern hemisphere from the frigid zone to the temperate zone. The mouth is large and flat like a duck's, and the lower jaw is prominent. It is one of the most aggressive carnivorous freshwater fish, attacking other fish as well as frogs, mice, and ducks.

It is said that it can eat as much food as its own weight in a day. Because of its longevity, the fish can occasionally be found in huge sizes. Because of its excellent meat flavor, it is a good target for fishing.

There are as many as eight species of dogfish in the world, and two species of dogfish are found in China, mainly in the Heilongjiang River basin. In addition, there is another white-spotted dogfish (E. lucius) living in the Erqis River basin in Xinjiang, which is distinguished by its light blue-white spots on the side of the body.

Life habits

The dogfish is extremely cunning when hunting. Whenever the dogfish see small animals swimming over will play tricks with the fat tail fins to vigorously stir up the water, to hide themselves, motionless peep at the small animals swimming over to reach a certain distance, then suddenly a mouthful of its bite, and then eat a large portion of the small animals, the remaining part of the teeth hanging on, to be eaten next time.