salmon

[local name] salmon, salmon.

[morphological characteristics] the general body length is about 60 cm. The body is lengthened and flattened laterally, and the back of the head is gradually raised. The head is big and flat on the side. I have a big mouth. The snout is protruding, slightly curved, shaped like a bird, and the male fish protrudes most obviously in the reproductive season, bending in the opposite direction, such as a clamp, so that the upper and lower jaw do not match. Small eyes. The branchial pore is large. The scales are small. The side line is obvious. There is a small fat fin opposite to the anal fin behind the dorsal fin. Tail fin shallowly forked. The body color changed greatly, from the beginning of the ocean into fresh water, the back and side of the body were yellowish green, gradually turned to bluish black, the abdomen was silver-white, and there were 10-12 orange-red marriage markings on both sides.

[place of origin, production season] Migration into China's Heilongjiang, Tumen River and other river systems, Wusuli River is more, September to October is the peak production season.

[economic value] Salmon is a valuable large economic fish. Big and fat, delicious meat, can be eaten fresh, can also be glue, smoking, processing canned, all need to be special flavor. Salted fish eggs, known as "red seeds", have high nutritional value and enjoy a high reputation in the international market.

Salmon is an export species, its English name is Chumsalmon, exported to the country: Japan.

Export ports: Liaoning and Heilongjiang.

Every year when the autumn wind begins to blow, China's Wusuli River is full of salmon. At this time, the Hezhe people living on both sides of the strait will cheer and shout, "Dayimaha," which means that the fish that come and go regularly have arrived. This is the origin of the name of salmon. There are many kinds of salmon, which are distributed all over the world.

The ancestors of salmon originally lived in rivers in cold areas, but there was a shortage of food there, so in order to find food and breed, they had to swim down the river and swim all the way to the ocean to find food and grow. There is plenty of food in the ocean, where they live freely. However, the long years have not made them fully adapt to life in the sea. As their bodies grow up and mature, they feel more and more homesick, and no matter how far away they are from their birthplace, they have to return to their hometown to raise children, because young salmon cannot be separated from the feeding of their hometown.

The salmon's journey home is long and arduous, and it has to go through several-meter-high waterfalls and many other obstacles. However, no matter how great the difficulties are, they will never turn back and forge ahead. They have extremely sensitive olfactory organs, and the smell of their hometown attracts them to swim back all the way back. They have to swim thousands of miles to reach the spawning site. When they first set out, they were plump, handsome and energetic. They swim so fast that they can swim 40 kilometers up the river every day and night. After a long journey day and night, after untold hardships, they finally returned to their hometown where they had parted for a long time. At this time, however, the salmon was exhausted, the whole body was dull, his back protruded like a hump, his jaw hooked inward, and his large, long teeth exposed, showing a ferocious face. Even so, they are actively planning their own weddings. At first they play in clear streams, then gather in groups in small pits, where females lay eggs and males sprinkle semen on them, the most glorious moment in a salmon's life. The reproductive salmon have been exhausted, have finished the journey of life in the sweet water of their hometown, and slowly die. At this time, the river is full of thousands of dead salmon, and their offspring begin to hatch and grow here.

Salmon eggs are much larger than ordinary fish, with a diameter of 7 mm, which is rich in nutrients for the development of small fish. The embryonic development period is very long, and it takes 3 to 4 months for the small fish to hatch from the egg membrane. The small fish that just came out of the shell is about 2 centimeters, and the residual yolk is still dragging under the belly to provide nutrition for its continued development. When they grow to about 4 centimeters, they leave the hatchery and go to the nearby water to feed on small animals, and sometimes the bodies of their parents become their food. Small salmon hatch in early spring, the weather is still very cold, other fish have not awakened, the environment is safe for them. When the length reaches 6 centimeters, they will leave their hometown and follow the rapids toward the sea.

Fish like salmon that are born in fresh water, then grow up in the ocean, and then migrate back to their hometown to reproduce after adulthood are called river-tracing migratory fish.