Dahao artificial breeding technology
2024-08-24 02:01:27
Andriasdavianus, commonly known as the crocodile, is a famous living fossil. It is listed as a national second-class animal and has high scientific research, food, medicinal and ornamental value. This article describes the culture technology of Otsuka.
A great deal of ecological habits
Cheng Yuxi is quiet, afraid of sound and light, generally not clustered, often living alone in the water in the cave during the day, go out for food at night, before returning to the original cave before dawn, in the early spring when daytime foraging or out of the sun. Juveniles have a habit of agglomeration, often grouping together in stone crevices. The winter eel hides in the cave and hibernates. It is a predator period from April to December each year. Cubs are predators of invertebrates, such as shrimps and crabs and insects. Chengyu preys on invertebrates, fish, frogs, snakes, and rodents, and occasionally eats green plants. If the population density is high and the food is lacking, there is a phenomenon of mutual food. During feeding, the water temperature rises sharply and the water quality deteriorates, which leads to anti-emeticity. When breathing, the scorpion fish exposes his head to the surface of the water, usually once every 10-30 minutes. The amount of oxygen consumed during the day is 20.3-32.8 mg/kg per hour and nighttime is 21.7-36.2 mg/kg per hour. The natural cockroach ratio is about 1:1. The reproductive method is oviparous and fertilized in vitro. From August to September, it is the reproductive season. Fertilized eggs are hatched for 30-40 days and metamorphosis is completed in 2-3 years. 3-5 Years of sexual maturity are achieved, but the growth cycle can be greatly shortened under artificial breeding conditions.
The construction of the second largest breeding farm
2.1 venue selection
Should choose dark sheltered, cool in summer, warm in winter and cool in summer, rich in water and stable in water temperature, and the source of water is clear, cool and flowing, such as mountain streams, reservoirs and groundwater, etc., taking into account the convenient source of feed, such as shrimp and crab aquatic. Rich in animal resources or near meat processing plants.
2.2 Aquaculture pond construction
It is divided into three types: juvenile fish ponds, young fish ponds and adult fish ponds. The cement structure has a smooth surface around the pool. It is leak-proof, leak-proof, and anti-escape. The bottom of the pool needs to be equipped with drainage holes. Generally, the pool is built indoors, with an area of ​​l-2 square meters and a wall height of 60 centimeters; an area of ​​5-10 centimeters of the young pond, with a wall height of 60-80 centimeters; the pool is filled with bricks or stones to form many caves; The area is 20-40 square meters and the wall height is 1.2 meters. The cave also needs to build a cave.
Three major breeding methods
At the temperature of 16-24°C, the water temperature of the giant salamander was the most vigorous, the fastest growing, and the feeding at 25-28°C was significantly reduced, and the feeding at 29°C was stopped. Artificial breeding can change the habit of hibernation and can grow evenly throughout the year. Water quality requirements pH 6.5-7.5, pH> 9 can lead to devastating death, dissolved oxygen with more than 3.5 mg / liter is appropriate, such as total hardness, chloride, ammonia nitrogen and other indicators need to meet the fishery water standards. Ponds should be shaded to avoid direct sunlight, and they must be strictly disinfected with bleach before use.
3.1 Nursery culture
The depth of the larvae is 20-30 cm. The newly hatched larvae resemble crickets to absorb their own yolk material. After 35-50 days, they begin to feed outside foods, such as small zooplankton, which can be fed in red after 70 days. Insects and mosquito flies larvae.
3.2 breeding of pups
The larval pond is 30 cm deep, and the seedlings are immersed in furan drugs for 5 to 10 minutes before entering the pond. The stocking density is generally 10-30 P/m2. The larvae, aquatic insects, and fish, crabs and crabs can be fed. The bait should be fresh. , Daily feeding twice, at 6-7 and 18-19 respectively, need to be drained and changed water every day, keep the water transparency, crystal clear.
3.3 Aquiculture
The depth of the pool water is 30-40 cm. The stocking specifications should be the same. The density is generally 1-3 per square meter. It can feed a variety of feeds, and it is advisable to use a small amount several times. To keep the water fresh, pay attention to frequent water changes. After feeding for a period of time, it should be kept in a timely manner in order to avoid the occurrence of small individuals who can eat small individuals.
34 Dagu feed types
Can feed a variety of low-quality fish, shrimp, crabs and other aquatic animals in seawater and freshwater, but Otsuka loves sea fish. Pigs, mutton, chickens, ducks, and their leftovers have a wide range of sources and high protein content, which is also a good feed for breeding large maggots. The artificially formulated feed formulated with fish flour, A-starch, soybean cake, wheat bran, bone meal, vitamins, and minerals in a certain proportion has an appropriate protein content of 45-50%. In addition, the addition of 1% pollen can significantly speed up the process. Growth rate.
A great deal of ecological habits
Cheng Yuxi is quiet, afraid of sound and light, generally not clustered, often living alone in the water in the cave during the day, go out for food at night, before returning to the original cave before dawn, in the early spring when daytime foraging or out of the sun. Juveniles have a habit of agglomeration, often grouping together in stone crevices. The winter eel hides in the cave and hibernates. It is a predator period from April to December each year. Cubs are predators of invertebrates, such as shrimps and crabs and insects. Chengyu preys on invertebrates, fish, frogs, snakes, and rodents, and occasionally eats green plants. If the population density is high and the food is lacking, there is a phenomenon of mutual food. During feeding, the water temperature rises sharply and the water quality deteriorates, which leads to anti-emeticity. When breathing, the scorpion fish exposes his head to the surface of the water, usually once every 10-30 minutes. The amount of oxygen consumed during the day is 20.3-32.8 mg/kg per hour and nighttime is 21.7-36.2 mg/kg per hour. The natural cockroach ratio is about 1:1. The reproductive method is oviparous and fertilized in vitro. From August to September, it is the reproductive season. Fertilized eggs are hatched for 30-40 days and metamorphosis is completed in 2-3 years. 3-5 Years of sexual maturity are achieved, but the growth cycle can be greatly shortened under artificial breeding conditions.
The construction of the second largest breeding farm
2.1 venue selection
Should choose dark sheltered, cool in summer, warm in winter and cool in summer, rich in water and stable in water temperature, and the source of water is clear, cool and flowing, such as mountain streams, reservoirs and groundwater, etc., taking into account the convenient source of feed, such as shrimp and crab aquatic. Rich in animal resources or near meat processing plants.
2.2 Aquaculture pond construction
It is divided into three types: juvenile fish ponds, young fish ponds and adult fish ponds. The cement structure has a smooth surface around the pool. It is leak-proof, leak-proof, and anti-escape. The bottom of the pool needs to be equipped with drainage holes. Generally, the pool is built indoors, with an area of ​​l-2 square meters and a wall height of 60 centimeters; an area of ​​5-10 centimeters of the young pond, with a wall height of 60-80 centimeters; the pool is filled with bricks or stones to form many caves; The area is 20-40 square meters and the wall height is 1.2 meters. The cave also needs to build a cave.
Three major breeding methods
At the temperature of 16-24°C, the water temperature of the giant salamander was the most vigorous, the fastest growing, and the feeding at 25-28°C was significantly reduced, and the feeding at 29°C was stopped. Artificial breeding can change the habit of hibernation and can grow evenly throughout the year. Water quality requirements pH 6.5-7.5, pH> 9 can lead to devastating death, dissolved oxygen with more than 3.5 mg / liter is appropriate, such as total hardness, chloride, ammonia nitrogen and other indicators need to meet the fishery water standards. Ponds should be shaded to avoid direct sunlight, and they must be strictly disinfected with bleach before use.
3.1 Nursery culture
The depth of the larvae is 20-30 cm. The newly hatched larvae resemble crickets to absorb their own yolk material. After 35-50 days, they begin to feed outside foods, such as small zooplankton, which can be fed in red after 70 days. Insects and mosquito flies larvae.
3.2 breeding of pups
The larval pond is 30 cm deep, and the seedlings are immersed in furan drugs for 5 to 10 minutes before entering the pond. The stocking density is generally 10-30 P/m2. The larvae, aquatic insects, and fish, crabs and crabs can be fed. The bait should be fresh. , Daily feeding twice, at 6-7 and 18-19 respectively, need to be drained and changed water every day, keep the water transparency, crystal clear.
3.3 Aquiculture
The depth of the pool water is 30-40 cm. The stocking specifications should be the same. The density is generally 1-3 per square meter. It can feed a variety of feeds, and it is advisable to use a small amount several times. To keep the water fresh, pay attention to frequent water changes. After feeding for a period of time, it should be kept in a timely manner in order to avoid the occurrence of small individuals who can eat small individuals.
34 Dagu feed types
Can feed a variety of low-quality fish, shrimp, crabs and other aquatic animals in seawater and freshwater, but Otsuka loves sea fish. Pigs, mutton, chickens, ducks, and their leftovers have a wide range of sources and high protein content, which is also a good feed for breeding large maggots. The artificially formulated feed formulated with fish flour, A-starch, soybean cake, wheat bran, bone meal, vitamins, and minerals in a certain proportion has an appropriate protein content of 45-50%. In addition, the addition of 1% pollen can significantly speed up the process. Growth rate.
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