CATDOLL : CATDOLL: Is there a breeding base for turtledoves?

1. Is there a breeding base for turtledoves?

Well-known in the industry are Xiaofang Zhenqi

2. Is there a breeding base for turtledoves?

Well-known in the industry are Xiaofang Zhenqi

3. Tiger fish breeding

1. Biological characteristics

The golden tiger grouper has a round and spindle-shaped body and a strong physique; the back is olive green, the belly is milky white, the sides of the body are green to golden yellow, and there are 6 dark stripes arranged perpendicular to the length of the body; the pectoral fins, pelvic fins and anal fins are orange-red, sometimes bright red.

Golden tiger grouper is a kind of wide-ranging freshwater fish, with a suitable growth temperature of 1-40℃, and a habit of feeding and growing all year round. Its pH value adaptability range is 6.5-8.5, and it shows a high degree of adaptability and tolerance when the oxygen drops to 3.8mg per liter.

Under natural conditions, golden grouper mainly feeds on small fish, shrimps, and aquatic invertebrates. Fry with a body length of 2.5 to 3.0 cm mainly feed on zooplankton such as rotifers, cladocerans, and copepods. When they are 5 to 8 cm long, they feed a lot of zooplankton, and after 8 cm, they turn to mainly feed on benthic animals. Artificially cultivated golden grouper can be domesticated to feed on artificial compound feed.

2. Artificial breeding

1. Inducing labor

In natural waters, male golden grouper fish reach sexual maturity in one year, while female fish need 2 to 3 years. Female fish lay about 3,000 to 40,000 eggs. The best water temperature for inducing spawning of golden grouper fish is 16℃ to 20℃. When the water temperature stabilizes at around 16℃, artificial spawning can be carried out. Select mature broodstock 2 hours in advance and temporarily keep them in the net cage, supplemented by slow-flowing water stimulation. Oxytocics include carp pituitary gland, chorionic gonadotropin, luteinizing hormone-releasing hormone analogs, etc. Male fish are injected with one injection, and female fish are injected with two injections. Generally, artificial insemination or natural spawning and fertilization can be carried out after 8 to 24 hours. In order to increase the fertilization rate during natural spawning and fertilization, the ratio of male to female fish should be more than 1 to 2.

2. Incubation facilities

The incubation container is a conical incubation bucket made of food-grade plastic, with a diameter of 60 cm, a height of 100 cm, and an effective volume of 100 liters. Each incubation bucket is equipped with independent water inlet and outlet pipes.

3. Incubation methods and conditions

The eggs of golden tiger fish are slow-sinking eggs, transparent and light green; if they are opaque and white, they are dead eggs. The hatching water is treated by filtration, biological treatment, ultraviolet sterilization and aeration. The water inlet is directly connected to the conical bottom of the hatching bucket. The backwash flow hatching technology is adopted. The bottom is backwashed by adjusting the appropriate water flow to keep the eggs suspended. The water flow should not be too large to avoid excessive recoil force to damage the embryo. Before hatching, the fish eggs are disinfected with hydrogen peroxide to prevent water mold disease. 50,000 eggs are placed in each bucket. The dissolved oxygen content of the inlet water is required to be above 7 mg/L. The optimal water temperature for hatching is 16-18℃, and the water temperature must not exceed 20℃, otherwise the hatching rate will decrease and the deformity rate will increase; poor water quality or turbidity often causes water mold disease. Therefore, water temperature control and water quality are extremely important. The entire hatching process should be carried out indoors, avoiding direct sunlight, and whitish dead eggs should be removed every day to prevent water mold from growing. The length of the incubation period depends on the water temperature. Generally, it takes 12 days at 14°C and 5 days at 18°C. Within the range of 14-18°C, the hatching rate is about 85%, and the hatching of fertilized eggs is generally completed within 5-6 days.

4. Harvest seedlings

There is a seedling collection facility under the hatching bucket, that is, an 80-mesh seedling collection net box is placed in the container, and the water level is 20-30 cm. The water flow cannot be too large to avoid "sticking to the seedlings". After the fry break the membrane, they flow directly into the seedling collection net box. When the fry in the net box reaches a certain density, the fry are counted and transferred to the nursery pond. You can also use a bowl to directly scoop them out of the hatching bucket with water, count them, and transfer them to the nursery pond.

3. Breeding and Production

1. Fry production. For extensive breeding in ponds, the most suitable area is 3 to 5 mu, and the water depth is 1.0 to 1.5 meters. Before stocking, pay attention to fertilizing the water quality, and the stocking density is generally 50,000 to 100,000 per mu; semi-intensive breeding is to use cement pools of several to dozens of square meters to breed golden tiger grouper, and generally thousands of fish eggs are placed per square meter; pay attention to the stocking density when intensive breeding, and the general starting density is 100,000 to 200,000 per mu.

2. Fish breeding. When the fry grow to 2-3 cm, they need to be properly stocked, generally 5,000-6,000 per mu, and intensive breeding can increase to 7,000-10,000 per mu. During the breeding process, the fertilizer and water method is used. When the body length reaches 1.8 cm, it can be domesticated and fed with artificial compound feed.

3. Fish breeding. The pond area is 5 to 15 mu, and the water depth is 1.5 to 2.5 meters. 1500 to 3000 fish of 10 to 15 cm in size are stocked per mu. A small amount of fertilizer is applied, combined with feeding of complete feed, daily management is done well, and some flower carp, silver carp and other fish are raised. At the end of the year, the average individual can reach the marketable size of more than 150 grams, and the yield per mu can reach more than 400 kilograms.

4. Tiger grouper breeding

1. Biological characteristics

The golden tiger grouper has a round and spindle-shaped body and a strong physique; the back is olive green, the belly is milky white, the sides of the body are green to golden yellow, and there are 6 dark stripes arranged perpendicular to the length of the body; the pectoral fins, pelvic fins and anal fins are orange-red, sometimes bright red.

Golden tiger grouper is a kind of wide-ranging freshwater fish, with a suitable growth temperature of 1-40℃, and a habit of feeding and growing all year round. Its pH value adaptability range is 6.5-8.5, and it shows a high degree of adaptability and tolerance when the oxygen drops to 3.8mg per liter.

Under natural conditions, golden grouper mainly feeds on small fish, shrimps, and aquatic invertebrates. Fry with a body length of 2.5 to 3.0 cm mainly feed on zooplankton such as rotifers, cladocerans, and copepods. When they are 5 to 8 cm long, they feed a lot of zooplankton, and after 8 cm, they turn to mainly feed on benthic animals. Artificially cultivated golden grouper can be domesticated to feed on artificial compound feed.

2. Artificial breeding

1. Inducing labor

In natural waters, male golden grouper fish reach sexual maturity in one year, while female fish need 2 to 3 years. Female fish lay about 3,000 to 40,000 eggs. The best water temperature for inducing spawning of golden grouper fish is 16℃ to 20℃. When the water temperature stabilizes at around 16℃, artificial spawning can be carried out. Select mature broodstock 2 hours in advance and temporarily keep them in the net cage, supplemented by slow-flowing water stimulation. Oxytocics include carp pituitary gland, chorionic gonadotropin, luteinizing hormone-releasing hormone analogs, etc. Male fish are injected with one injection, and female fish are injected with two injections. Generally, artificial insemination or natural spawning and fertilization can be carried out after 8 to 24 hours. In order to increase the fertilization rate during natural spawning and fertilization, the ratio of male to female fish should be more than 1 to 2.

2. Incubation facilities

The incubation container is a conical incubation bucket made of food-grade plastic, with a diameter of 60 cm, a height of 100 cm, and an effective volume of 100 liters. Each incubation bucket is equipped with independent water inlet and outlet pipes.

3. Incubation methods and conditions

The eggs of golden tiger fish are slow-sinking eggs, transparent and light green; if they are opaque and white, they are dead eggs. The hatching water is treated by filtration, biological treatment, ultraviolet sterilization and aeration. The water inlet is directly connected to the conical bottom of the hatching bucket. The backwash flow hatching technology is adopted. The bottom is backwashed by adjusting the appropriate water flow to keep the eggs suspended. The water flow should not be too large to avoid excessive recoil force to damage the embryo. Before hatching, the fish eggs are disinfected with hydrogen peroxide to prevent water mold disease. 50,000 eggs are placed in each bucket. The dissolved oxygen content of the inlet water is required to be above 7 mg/L. The optimal water temperature for hatching is 16-18℃, and the water temperature must not exceed 20℃, otherwise the hatching rate will decrease and the deformity rate will increase; poor water quality or turbidity often causes water mold disease. Therefore, water temperature control and water quality are extremely important. The entire hatching process should be carried out indoors, avoiding direct sunlight, and whitish dead eggs should be removed every day to prevent water mold from growing. The length of the incubation period depends on the water temperature. Generally, it takes 12 days at 14°C and 5 days at 18°C. Within the range of 14-18°C, the hatching rate is about 85%, and the hatching of fertilized eggs is generally completed within 5-6 days.

4. Harvest seedlings

There is a seedling collection facility under the hatching bucket, that is, an 80-mesh seedling collection net box is placed in the container, and the water level is 20-30 cm. The water flow cannot be too large to avoid "sticking to the seedlings". After the fry break the membrane, they flow directly into the seedling collection net box. When the fry in the net box reaches a certain density, the fry are counted and transferred to the nursery pond. You can also use a bowl to directly scoop them out of the hatching bucket with water, count them, and transfer them to the nursery pond.

3. Breeding and Production

1. Fry production. For extensive breeding in ponds, the most suitable area is 3 to 5 mu, and the water depth is 1.0 to 1.5 meters. Before stocking, pay attention to fertilizing the water quality, and the stocking density is generally 50,000 to 100,000 per mu; semi-intensive breeding is to use cement pools of several to dozens of square meters to breed golden tiger grouper, and generally thousands of fish eggs are placed per square meter; pay attention to the stocking density when intensive breeding, and the general starting density is 100,000 to 200,000 per mu.

2. Fish breeding. When the fry grow to 2-3 cm, they need to be properly stocked, generally 5,000-6,000 per mu, and intensive breeding can increase to 7,000-10,000 per mu. During the breeding process, the fertilizer and water method is used. When the body length reaches 1.8 cm, it can be domesticated and fed with artificial compound feed.

3. Fish breeding. The pond area is 5 to 15 mu, and the water depth is 1.5 to 2.5 meters. 1500 to 3000 fish of 10 to 15 cm in size are stocked per mu. A small amount of fertilizer is applied, combined with feeding of complete feed, daily management is done well, and some flower carp, silver carp and other fish are raised. At the end of the year, the average individual can reach the marketable size of more than 150 grams, and the yield per mu can reach more than 400 kilograms.