Pike has a slender body, a slightly flat side and a short tail handle. The tip of the head and the snout are particularly long and flat, like duckbills. The mouth crack is extremely wide, and the corner of the mouth can extend backwards to half the length of the head. The teeth are well developed, and there are cone-shaped sharp teeth of different sizes on the upper and lower jaws, plough bone, ethmoid bone and tongue. Its teeth are different. The teeth of the upper jaw can be stretched and connected by ligaments. This kind of sharp teeth can hang the captured animals, and sometimes the food that can't be eaten can be hung on the teeth for later use. The scales are small and the lateral lines are not obvious. The dorsal fin is located on the back, close to the caudal fin, opposite to the gluteal fin, and the pectoral fin and ventral fin are smaller. The back and sides are grayish green or greenish brown, scattered in many black spots, and the abdomen is grayish white. There are also many small black spots on dorsal fin, gluteal fin and caudal fin, and the rest are gray.
Dog fish is fierce and cruel, and its actions are extremely quick and agile, and it can swim more than 8 kilometers per hour. Dog fish are not only extremely fierce, but also scheming. This is related to its lateral structure. The lateral line of pike is actually a row of scales with longitudinal grooves. It can not only play the role of ordinary lateral vibration sensing point, but also play the role of chemical sensing point. At the same time, Parker has extremely sensitive vision, which makes Parker feel the coming of prey very quickly. Usually, they live in slow-moving rivers, lakes and reservoirs in cold regions, like to swim on wide water surfaces, and often haunt the coastal areas with weeds, attacking other fish with their vigorous actions. Young fish are gentle and often live in groups, while adult fish live alone. It has obvious migration law. After thawing in spring, swim to the coastal area of the upstream estuary or enter the small estuary and bubble marsh to lay eggs. After spawning, it is fattened in dispersion, and overwinters in the deep water of rivers in winter. Dog fish feed on fish and eat a lot, and they continue to have a strong demand for food in winter, especially after breeding. Usually in the morning or evening, I look for food. At other times, I don't swim, but calm down to rest and slowly digest the food I have swallowed. The pike is very cunning when hunting. Every time a pike sees a small animal swimming, it will play tricks, muddy the water with its thick tail fin, hide itself, watch the small animal swim motionless, suddenly bite it when it reaches a certain distance, then eat more than half of the small animal three, five and two times, and the rest will be hung on its teeth and eaten next time. Stop feeding during the breeding season. Generally, fish aged 3-4 years reach sexual maturity. The breeding period is from the first ten days of April to June, the water temperature is 3-6℃, and they lay eggs with aquatic plants at the water depth of 0.5- 1.0 m, and the peak spawning period is 1 week. During the breeding season, when the calm water is rough, it symbolizes the arrival of female pike. The female pike is much fiercer than the male pike. If it is not in the breeding season, the male pike is afraid to approach the female pike. At this time, the female fish swims fast and irregularly. After a fierce swim, she went into the overgrown place and waited for the arrival of the male fish. Then the male fish swims carefully to the female fish. At this time, the female fish will drive away the unpleasant male fish, and the remaining male fish will surround the female fish. The female pike swam in front with great excitement, and the male pike chased after it. At this time, the male fish will keep fighting, fighting together, killing together, and then chasing the female fish that have already swam away. When the female pike began to get tired, she stayed in the grass and began to turn over, increasing the speed of turning over. At this time, the male fish approaches the female fish, rolls with it, and sometimes jumps up and confronts the female fish with his body. After about 15 minutes, the male fish begins to ovulate, and then the female fish ovulates. When the female fish finished laying eggs, a tail-tailed male fish hurriedly fled to avoid being bitten by the female fish. Although the female is quite tired, she still shows greed and ferocity, and begins to eat her own eggs and the unavoidable males. The pike grows fast and has a long life. Some people find a person who weighs 30-35 kilograms and is 70 years old. It is said that the longest life span can reach more than 200 years.
Dog fish are distributed in Heilongjiang river basin. In addition, there is another kind of white-spotted pike (E.lucius) that lives in the Irtysh River valley in Xinjiang. It is unique in that the spots on its side are light blue and white.
The natural output of pike is very large, and its meat is tender and white, which is no less than carp, crucian carp or salmon except for a slight smell of grass mud. The eggs of pike are poisonous and inedible.
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