Artificial breeding technique of pond angle fish
2018-05-25 16:00:42
Tong Kok Fish, or local beard owl, also known as bandits, is a fierce carnivorous fish. Pond anglers live in freshwater areas such as rivers, field ditches and rice fields. Tongjiao fish is delicate, delicious, with less muscle punctures and rich nutrition. It is popular with people. At the same time, it also has the effect of converging muscles and healing wounds and can be used as a tonic for patients after surgery.
There is a clear difference in the biological characteristics of Tong Kok Fish with Egyptian beard scorpion, Thai beard scorpion and hybrid plover. It is small in size and has a relatively slow growth rate. It has obvious burrowing habits and colonial habits. It has a short fish body, a flat head, a flat head behind, a smooth fish without scales, and a complete lateral line. It is wide, horizontal, and slightly inferior; Right, small eyes with active eyelids; dense villous and fine teeth on upper and lower jaws and cheekbones; small pectoral fins, with a pair of tough spines, long anal fins on dorsal fins, rounded fins on caudal fins; body color generally brownish-black or gray-yellow, body Side scattered some irregular white spots.
Tongjiao fish has already begun to take shape in Hainan, and it has great market potential and good market prospects. The artificial breeding techniques of Tongjiao Fish are described below for reference.
(i) Breeding of broodstock and selection of broodstock as wild individuals caught from natural waters are purchased from farmers' markets. Autumn and winter seasons are collected and put into fish ponds. The broodstock breeding is mainly monoculture, and the broodstock stocking density is 1500--3000 tails/ha. In order to meet the nutrition needed for its gonadal development, the foods fed are mainly loach and wild fish and are fed twice daily for 8:00- 9:00 in the morning and 2:00--3 in the afternoon: 00, the daily feeding amount is 3%--5% of the broiler's body weight. One month before oxytocin production, intensive cultivation is required. The amount of broodstock is 5%--8% of the body weight of the broodstock. Flush once every two weeks to promote gonad development and maturation. In addition, aquatic plants such as water hyacinth should be cultivated in water, or awnings should be erected to prevent excessive sunlight.
For the brooding fish used for urinating, we must choose a healthy adult fish with no injuries. Female body weight 0.5--0.75 kg / tail, bright body color, smooth, full of luster, abdomen enlargement, looming outline of the ovary, external genital sulcus was short-circular, guava hole was long fissure, external genital process far from the anal fin starting point. The external male genital projections are long strips, and the vents are round and small, opening at the end, and the extension of the genital process beyond the starting point of the anal fin.
(b) Artificial ostrich horn fish 1 is sexually mature in winter, breeding season is from April to September, and May to July is the period of intensive breeding. When the water temperature reaches 20--22°C, ovulation can be started. In the middle and late stages of oxytocin production, the broodstock matured well, and one injection method was used. The dose was HCG3000 units/kg body weight + LRH-A15 micrograms/kg body weight for females, and the male dose was halved. In the early stage of ovulation, broodstock maturation was poor and the effect of two injections was more stable. The first shot injection time is 11:00-12:00 AM, the dose is LRH-A3 micrograms/kg body weight + DOM2 mg/kg body weight of the female fish, the first male fish is not injected; the second needle injection time is 5 pm :00--6:00, the dose of female LCG1500 unit / kg body weight, male dose halved. The injection volume is not more than 1 ml per fish and the injection site is the base of the pectoral fin.
Although Tongjiao fishes produce viscous eggs, their viscidities are lower than those of fish eggs such as clams and cockroaches. Therefore, it is better to lay nests at the bottom of nests to minimize loss of fish eggs. The fish nests are reinforced frames, each with an area of ​​1 square meter (0.5 meters 2 meters), and 2 pieces are 1 group. After sewing the 60-mesh sieve, the disinfected palms are sewn. After the aphrodisiac broodstock is injected into the spawning pool, it should be stimulated with appropriate water to promote its oviposition. With the type of aphrodisiac, the number of injections, and the temperature of the water, the effect time is 12-17 hours, the spawning rate is 85%-95%, and the fertilization rate is 90%--100%.
(3) The artificial incubation water temperature is preferably 24-26°C, and the hatching rate can be as high as 95%. The water temperature is too low, the hatching time is long, and it is easy to suffer from water mildew disease. The water temperature is too high, the embryonic development is fast, the fish fry come out of the membrane in advance, and there are many malformed seedlings, which affects the hatching effect. Keep fresh water during incubation. The hatching pool is covered with shaded awnings to make it in a dark environment to prevent direct damage from strong light to fish eggs, and to meet the living habits of larvae avoiding strong light and weak light, and prevent drastic changes in water temperature. After the spawning is completed, the fish nest is moved into the hatchery pond and the fish nest is erected in an inverted “V†shape to facilitate the circulation of water. Microfluidic state should be maintained during incubation.
(4) When the larvae emerge from the film, the fish nests and dead eggs should be promptly removed to prevent water quality deterioration and affect the growth of the fry. The newly hatched larvae were attached to the fish's nest. The yolk was mainly used as a nutrient in the yolk sac. After 3 days, the yolk began to feed flatly. At this time, the cooked egg yolk could be fed. Since most of the fry are still attached to the fish nest, the fry should be prevented from being taken away when the fish nest is removed. The emergence rate is 85% - 95%.
There is a clear difference in the biological characteristics of Tong Kok Fish with Egyptian beard scorpion, Thai beard scorpion and hybrid plover. It is small in size and has a relatively slow growth rate. It has obvious burrowing habits and colonial habits. It has a short fish body, a flat head, a flat head behind, a smooth fish without scales, and a complete lateral line. It is wide, horizontal, and slightly inferior; Right, small eyes with active eyelids; dense villous and fine teeth on upper and lower jaws and cheekbones; small pectoral fins, with a pair of tough spines, long anal fins on dorsal fins, rounded fins on caudal fins; body color generally brownish-black or gray-yellow, body Side scattered some irregular white spots.
Tongjiao fish has already begun to take shape in Hainan, and it has great market potential and good market prospects. The artificial breeding techniques of Tongjiao Fish are described below for reference.
(i) Breeding of broodstock and selection of broodstock as wild individuals caught from natural waters are purchased from farmers' markets. Autumn and winter seasons are collected and put into fish ponds. The broodstock breeding is mainly monoculture, and the broodstock stocking density is 1500--3000 tails/ha. In order to meet the nutrition needed for its gonadal development, the foods fed are mainly loach and wild fish and are fed twice daily for 8:00- 9:00 in the morning and 2:00--3 in the afternoon: 00, the daily feeding amount is 3%--5% of the broiler's body weight. One month before oxytocin production, intensive cultivation is required. The amount of broodstock is 5%--8% of the body weight of the broodstock. Flush once every two weeks to promote gonad development and maturation. In addition, aquatic plants such as water hyacinth should be cultivated in water, or awnings should be erected to prevent excessive sunlight.
For the brooding fish used for urinating, we must choose a healthy adult fish with no injuries. Female body weight 0.5--0.75 kg / tail, bright body color, smooth, full of luster, abdomen enlargement, looming outline of the ovary, external genital sulcus was short-circular, guava hole was long fissure, external genital process far from the anal fin starting point. The external male genital projections are long strips, and the vents are round and small, opening at the end, and the extension of the genital process beyond the starting point of the anal fin.
(b) Artificial ostrich horn fish 1 is sexually mature in winter, breeding season is from April to September, and May to July is the period of intensive breeding. When the water temperature reaches 20--22°C, ovulation can be started. In the middle and late stages of oxytocin production, the broodstock matured well, and one injection method was used. The dose was HCG3000 units/kg body weight + LRH-A15 micrograms/kg body weight for females, and the male dose was halved. In the early stage of ovulation, broodstock maturation was poor and the effect of two injections was more stable. The first shot injection time is 11:00-12:00 AM, the dose is LRH-A3 micrograms/kg body weight + DOM2 mg/kg body weight of the female fish, the first male fish is not injected; the second needle injection time is 5 pm :00--6:00, the dose of female LCG1500 unit / kg body weight, male dose halved. The injection volume is not more than 1 ml per fish and the injection site is the base of the pectoral fin.
Although Tongjiao fishes produce viscous eggs, their viscidities are lower than those of fish eggs such as clams and cockroaches. Therefore, it is better to lay nests at the bottom of nests to minimize loss of fish eggs. The fish nests are reinforced frames, each with an area of ​​1 square meter (0.5 meters 2 meters), and 2 pieces are 1 group. After sewing the 60-mesh sieve, the disinfected palms are sewn. After the aphrodisiac broodstock is injected into the spawning pool, it should be stimulated with appropriate water to promote its oviposition. With the type of aphrodisiac, the number of injections, and the temperature of the water, the effect time is 12-17 hours, the spawning rate is 85%-95%, and the fertilization rate is 90%--100%.
(3) The artificial incubation water temperature is preferably 24-26°C, and the hatching rate can be as high as 95%. The water temperature is too low, the hatching time is long, and it is easy to suffer from water mildew disease. The water temperature is too high, the embryonic development is fast, the fish fry come out of the membrane in advance, and there are many malformed seedlings, which affects the hatching effect. Keep fresh water during incubation. The hatching pool is covered with shaded awnings to make it in a dark environment to prevent direct damage from strong light to fish eggs, and to meet the living habits of larvae avoiding strong light and weak light, and prevent drastic changes in water temperature. After the spawning is completed, the fish nest is moved into the hatchery pond and the fish nest is erected in an inverted “V†shape to facilitate the circulation of water. Microfluidic state should be maintained during incubation.
(4) When the larvae emerge from the film, the fish nests and dead eggs should be promptly removed to prevent water quality deterioration and affect the growth of the fry. The newly hatched larvae were attached to the fish's nest. The yolk was mainly used as a nutrient in the yolk sac. After 3 days, the yolk began to feed flatly. At this time, the cooked egg yolk could be fed. Since most of the fry are still attached to the fish nest, the fry should be prevented from being taken away when the fish nest is removed. The emergence rate is 85% - 95%.