Daisui's habits
Otsuka commonly known as giant salamander, for our country's specialty, it is also known as the Chinese big brother. Daxie is distributed throughout China, and it is mainly produced in deep mountain jungle streams in South China and Southwest China. Common weight 2-5kg, body length of about 50 ~ 150cm, the largest individual up to 10 ~ 20kg. Due to its delicate meat, delicious taste and rich nutrition, it has high food and medicinal value. In recent years, due to the serious destruction caused by human overfishing and killing and the natural ecological environment, resulting in the declining resources of Dagu, which are endangered animals, it has been listed as the second category of key protected wild animals by the state. Therefore, it is of great practical significance to carry out the research and discussion on the biological characteristics, artificial reproduction and breeding techniques of the giant salamander. First, the biological characteristics of Daphnia 1? Morphological characteristics Euphorbia is a amphibious, axillary, concealed family, bare skin, smooth and elastic skin, covered with irregular punctate or plaque-like gray pigment, body color often change due to changes in the environment. The abdomen is grayish white, with a wide, flat head, a roughly semi-circular mouth, veneers and jaws with teeth, and well-developed ploy-tooth teeth. These are the main tools for catching food. Adults do not have cockroaches, and they breathe with their lungs. The eyes are distributed over the head. On both sides of the head, the eye is widely spaced and flat, with no eyelids, and each side of the nostril is a small, park-shaped eye, located in front of the eye. The vertebral body is double-concave, and the abdomen is obese. It occupies about 1/2 of its body length. There is an inconspicuous degenerative dorsal fin extending to the tail. The scorpion has a pair of anterior and posterior limbs, 4 forelimbs, and 5 toes for the hind limbs. The limb shape is similar to the frog limbs. The movement of the big cormorant mainly depends on the limbs. There is a genital hole between the abdomen of the two hind limbs. The outer end is consistent with the drainage hole. The female deer does not have a fertilization device. 2? Living habits Euphorbia is a warm-blooded animal, often living in streams in deep mountain jungles. It enjoys activities in the middle and lower layers of waters. It can survive in 0-38°C water, and the suitable water temperature is 16-28°C. When the water temperature is lower than 14°C and higher than 33°C, the feeding is reduced, the action is dull, and the growth is slow. When the water temperature is below 10°C, hibernation begins and the food stops completely. The Dagu requires a relatively higher concentration of dissolved oxygen and water in the water. Strictly, when the dissolved oxygen in the water is above 5mg/L, the water quality is fresh and pollution-free, which is most suitable for the growth and development of the giant salamander. Especially during the hatching and breeding stages and the larval stage, the dissolved oxygen in the water body must be kept above 5.5mg/L. The water in the pool is kept in a constant flow state, with a pH range of 6.0-9.0 and an optimum pH of 6.8-8.2. In the natural environment, Da Lat often runs benthic life and hides in the cave during the day. At night, he climbs out of the cave to feed on the ground and is happy and dark, afraid of light and scared. It feeds on small fish, shrimps, and other aquatic animals in the stream. It can prey on fish whose length is equal to 1/2 of its length, and fish that feeds on it are generally rayhead fish, tigerfish, bonito fish, and clumpfish. Betta, betta, loach, blackbird, and mollusks such as snails and clams also prey on aquatic insects, water rats, water snakes, frogs, and other animals. Under artificial breeding conditions, in addition to feeding a variety of wild fish, it can also feed on some animal carcasses, animal blood or viscera. By eating food, artificial feed can also be taken. 3? Growth characteristics and breeding habits Under natural environmental conditions, the bait is rich in resources because of its good water quality, and its growth rate is faster. The largest individual can reach 10-15 kg. Under artificial breeding conditions, the growth rate is the fastest at 2 to 5 years of age, especially at the 2nd age, and the annual growth rate of body weight reaches 6.5 to 9.8, and the body growth rate is about 2.2. The increase in body weight of ponds and ponds is significantly faster than that of wild populations. This is mainly due to the fact that artificial feeding is more comprehensive and the water temperature is more suitable. Even in severe winters, it will not hibernate. Under natural conditions, sexual maturity is usually reached at 4 years of age. Under artificial breeding conditions, mature females aged 4 to 5 years are sexually mature. When the bull eel matures, the abdomen of the squeezing male can discharge the milk white semen, and can be dispersed by dripping into the water. The female pupa can produce rosary-like long-chain zonal eggs and fertilize in vitro when fertilized. From May to September, it is the breeding season of the big pheasant. During the breeding season, the big pheasant often makes a call like a doll. The optimum temperature for hatching and breeding is 22 to 25°C. China has carried out nearly 30 years of research on artificial breeding of giant salamanders. Up to now, the artificial propagation of giant salamander has not progressed so far, the success rate has been extremely low, and the source of seedlings is still mainly natural resources. Therefore, the artificial breeding of giant salamanders is carried out. Research on reproductive technology is an important issue and main direction for the future. 4. Seedlings are identified in the amphibians, and the phylum Continuum in the order of the head are very similar to those of the Polygonaceae, Polygonidae, and Polygonaceae. In recent years, they have been stimulated by the high profits of giant salamanders. Seed suppliers have mixed eyes and often sell adults without spot fattening or broodstock as big seedlings, causing losses to farmers. In order to distinguish the cercaria from the ceramistidae and pupa families, their morphological characteristics are compared as follows for reference. 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