33 results about "Brachymystax lenok" patented technology

The invention provides a distant hybridization method for taimen and brachymystax lenok, relating to a hybridization method for fishes belonging to two different salmon families. The invention solves the problem that the taimen and the brachymystax lenok can not be hybridized due to far genetic relationship and different breeding habit. The method of the invention comprises the steps as follows: 1. cultivating is carried out; 2. the female taimen is ripened; 3. induced spawning of the female taimen and the male brachymystax lenok are respectively carried out; 4. fertilized eggs are obtained; 5. hatching is carried out. The method of the invention leads two fishes with different living and breeding habits, classification statuses, genetic relationships and laying seasons to mature and carry out the spermiation and ovulation in the same period, and the hybrid is obtained; furthermore, the fertilization rate is more than 85% and the hatching rate is more than 80%. The hybrid obtained by the method of the invention inherits the characteristic of the brachymystax lenok and the taimen, is easy to be domesticated and has good meat-taste, quick growing speed and strong disease-resistance capability.

The invention discloses a method for artificial reproduction of brachymystax lenok tsinlingensis. The method for artificial reproduction of the brachymystax lenok tsinlingensis comprises the steps that (A) mature and highly active brachymystax lenok tsinlingensis is selected to serve as a parent; (B) reinforced cultivation of the parent is conducted; (C) artificial spawning is conducted, wherein two dosages of artificial spawning medicine is injected into the parent for artificial spawning from the end of March to the middle of April; (D) semen collection is conducted manually, wherein the parent is bred in an artificial spawning pond after the artificial spawning medicine is injected into the parent, a water inlet pipe is erected at one end of the artificial spawning pond, and the abdomen of the brachymystax lenok tsinlingensis parent is pressed regularly so that semen collection can be achieved from the alive brachymystax lenok tsinlingensis parent; (E) artificial insemination is conducted, wherein after an ovum is rinsed with normal saline for fish is collected, seminal fluid of a milter is squeezed on the ovum, then mixing is conducted with a feather, andartificial insemination is conducted; (F) artificial incubation is conducted, wherein a fertilized ovum is washed with purified water and then is poured in an incubation groove for incubation, a porous dandruff comb is arranged on the bottom of the incubation groove, and when fry which can swim appears, the fry is moved out of an incubation device to be bred in a fish tank. The method for artificial reproduction of the brachymystax lenok tsinlingensis is easy to implement, operation is easy and convenient, the fertilization rate and the hatching rate are high, obtained fish offspring are healthy, the body sizes of the obtained fish offspring are even, the rate of survival is high, the utilization rate of fish bait is high, and the growing speed is high.

An artificial inducement method for spawning of brachymystax lenok, relates to an artificial inducement method for spawning of fish, which solves the problems of unfocused spawning time, long spawning period and low hatching rate, comprising the steps of: 1. respectively delivering the parent fish into an induced spawning pond in spring; 2. performing induced spawning on the parent fish when water temperature reaches 7-12 DEG C; 3. injecting oxytocic in the pectoral fin basis free of squamae after the male and the female fish are hocused, adopting the secondary injection, then mixing the parent fish, after seven days, discharging seminal fluid by the male fish and ovulating by the female fish, namely manual induced spawning of brachymystax lenok. The invention causes spawning time to centralize, the spawning time is shortened by 10-15 days, and the hatching rate reaches 60%-70%; manual induced spawning is performed to breed the parent fish, the induced spawning success rate of the male fish reaches 100%, and the induced spawning success rate of the female fish reaches 40-50%; manual induced spawning is performed on wild parent fish, the induced spawning success rate of the male fish reaches 100%, and the induced spawning success rate of the female fish reaches 50-80%.

The invention relates to a special feed for juvenile fishes of brachymystax lenok, and relates to a special feed for juvenile fishes. The invention solves the problem of low cultivation survival rate caused by no special specific feed in an existing process of cultivating the juvenile fishes of the brachymystax lenok. The special feed for the juvenile fishes of the brachymystax lenok is prepared by mixing fish meal, casein, bean pulp, beer yeast, corn gluten meal, wheat flour, fish oil, vitamin premix, mineral matter premix, choline chloride, soyabean lecithin, sodium carboxymethylcellulose and Ca(H2PO4)2. After the juvenile fishes of the brachymystax lenok are fed by using the feed provided by the invention, the cultivation survival rate is increased by 15-30 percent, and the average weight gain rate is increased by 140-220 percent; and the special feed for the juvenile fishes of the brachymystax lenok has the effects of complete nutrition, promoting the juvenile fishes of the brachymystax lenok to grow, increasing the immunity and the like, and is suitable for commercialized production. The special feed for the juvenile fishes of the brachymystax lenok can be used for feeding the juvenile fishes of the brachymystax lenok.

The invention discloses a cultivation method for brachymystax lenok fry. The cultivation method includes the steps of A, artificial incubation; B, fry opening feeding; C, transferring out of an incubation tank for cultivation, and stocking at reasonable density; D, pool dividing domestication, wherein palatable bait is selected, food domestication control is conducted, and meanwhile scientific daily management and disease prevention are conducted. According to the biological characteristics of brachymystax lenok, total artificial regulation is conducted on the aspects of water temperature, illumination, dissolved oxygen and the like, the advantages that the physiques of the fry are healthy, strong and balanced, the bait utilization rate is high, environmental tolerance is high, and disease resistance is high are achieved by means of food intake regulation and standard management, and the fertilized ovum hatching rate of the brachymystax lenok and the growth rate and survival rate of offspring fishes are greatly increased. The offspring fishes are healthy, strong and balanced, high environmental tolerance and disease resistance are achieved, and occurrence of malformation is greatly reduced. The method is simple, high in operability, good in practical applicability and completely suitable for large-scale production of the fry, and is used for species resource protection and natural population restoration of the brachymystax lenok accordingly.