CATDOLL : CATDOLL: Artificial hatching techniques for crucian carp How to induce spawning and hatch crucian carp

1. Artificial hatching techniques for crucian carp How to induce spawning and hatch crucian carp

1. April to May every year is the peak breeding season for crucian carp. In order to achieve early induction, early birth, early breeding and fast growth, induction of birth can be carried out after the cold wave in early to mid-April (between Qingming and Guyu), when the temperature rises and the water temperature stabilizes at above 16°C, and no cold air activity is predicted for a few days.

2. Methods/Steps:

(1) Before inducing spawning, various tools should be prepared, such as oxytocin, fish nests (for still water hatching), debonding agents (for flowing water hatching), as well as spawning ponds (or cages), hatching facilities and all other necessary items, and disinfection should be done properly.

(2) Oxygen and dosage The commonly used oxytocin is the same as that for carp, but most of them use mixed dosages. The commonly used dosage is PG1mg + HCG1000 IU + LRH A 15 ug, or HCG800~1000 IU + LRH-A35 ug per kilogram of female fish, or HCG500 IU + LRH-A 5 ug + DOM 1mg, etc., which can all achieve good results. The dosage for male fish is halved, or only 1/3~2/5.

(3) Effect period and spawning When the water temperature is between 16 and 20°C, the effect period of the oxytocin is mostly 10 to 20 hours, and can also be extended to 30 hours. To facilitate operation and control spawning in the early morning, the net is usually pulled, fish are selected, and injection is performed at 5 to 6 pm. The male and female fish are then moved to the net cages to wait for spawning to avoid accidents.

(4) The cages should be kept at a certain distance. Starting from 4 hours after injection, the degree of maturation of the female fish should be checked every hour. When eggs are found to flow out by themselves, it means that the time has come and artificial egg collection and fertilization can be carried out immediately.

(5) The female fish exposes its cloaca and slowly squeezes the eggs into a sterilized porcelain basin. When a certain number of eggs are reached, the semen of the male fish (or Xingguo red carp) is immediately dripped into the basin. The eggs are gently stirred with a feather. The eggs are left to stand for 1 minute to allow them to be fully fertilized. This completes the artificial insemination process.

(6) Fertilized eggs are often treated differently depending on the incubation method. Still water incubation: Place the disinfected fish nest in a large basin filled with clean water, slowly pour the fertilized eggs onto the fish nest, and gently stir with your hands to spread the fertilized eggs and evenly adhere to the fish nest. After 3 to 5 minutes when the eggs are fully adhered, move the fish nest to a 15 mg/L malachite green solution for immersion and disinfection, and then move it into the prepared hatching pool or cage for incubation.

2. How big is the crucian carp after seven days of hatching?

It depends on the temperature.

Generally, it takes 3 to 7 days from the fertilization of fish eggs to the hatching of small fish. If the average water temperature is 15 degrees Celsius to 20 degrees Celsius, the hatching days are 5 to 7 days; when the average water temperature is 20 degrees Celsius, the small fish can be hatched in 4 to 5 days; when the average water temperature is 20 degrees Celsius to 25 degrees Celsius, it only takes 2 to 3 days. In short, the lower the water temperature, the longer the hatching time.

Crucian carp develops relatively quickly and can lay eggs once a year. It grows while laying eggs. The spawning period is also long, lasting from spring to autumn, and the number of eggs laid is large.

3. How many days does it take for crucian carp fertilized eggs to float out into small fish?

Generally, it takes 3-7 days from the fertilization of fish eggs to the hatching of small fish. If the average water temperature is 15-20℃, the hatching days are 5-7 days; when the average water temperature is 20℃, the small fish can be hatched in 4-5 days; when the average water temperature is 20-25℃, it only takes 2-3 days. In short, the lower the water temperature, the longer the hatching time.

4. Is crucian carp hermaphrodite? How to breed it?

Crucian carp is not hermaphrodite. It is fertilized outside the body. When the female is in estrus, she swims in front and the male chases behind. The female lays eggs and the male lays sperm. The sperm and egg combine to form a fertilized egg, which becomes small fish after hatching.

An omnivorous fish that lives in fresh water, with a plump body. Crucian carp is a bottom-dwelling fish. Generally, it swims, forages, and lives underwater. When the air and water temperatures are high, it will also swim and forage in the middle and lower layers of the water, or the middle and upper layers.

Crucian carp mainly feed on plant-based food. Plant-based feed is abundant in water bodies and there are many varieties. The stems, leaves, buds and fruits of vascular aquatic plants are the favorite food of crucian carp. Crucian carp is widely farmed in the wild and in ponds in Songhua River. It is rich in nutrients. Diatoms and some algae are also the food of crucian carp, as well as shrimps, earthworms, young snails and insects.

Additional information:

Crucian carp has the most delicious meat and is loved by the people. Crucian carp is very adaptable and can survive in deep or shallow water, flowing or still water. It can still grow and reproduce even in the highly alkaline waters with a pH of 9 and the Dari Lake with a salinity of up to 4.5%.

Crucian carp's feeding time varies with the season. Spring is the peak feeding season, and they feed continuously day and night; in summer, they feed in the morning, evening, and at night; in autumn, they feed all day; and in winter, they feed around noon.

Reference: Baidu Encyclopedia - Crucian carp

5. How big does a crucian carp have to be to lay eggs?

Crucian carp (Carassius auratus) belongs to the Cypriniformes, Cyprinidae, Cyprininae, and the genus Carassius. Common names: Xitou, Carassius auratus (Hubei), Carassius auratus seeds (Northeast China), River Carassius auratus (Shanghai), Yue Carassius auratus (Guangdong); ancient names: C, Carassius auratus, and Han Carassius auratus.

The gonads of crucian carp mature earlier than those of other fish, so the fish can lay eggs every other year, and grow while laying eggs. One-year-old crucian carp can lay eggs.

Moreover, the spawning period is long, lasting from spring to autumn, and the number of eggs is large, and the eggs are laid on water plants or other objects in shallow waters. The strong reproductive capacity of crucian carp is an important reason for its wide distribution and large number. Another point is that crucian carp still forages during spawning, which is different from other fish.

Bait fish grow slowly, and the fish only grow to about 100 grams in the same year. Because of this, most crucian carps are wild and rarely stocked.

Crucian carp can lay eggs after 2 years. Generally, the weight of wild crucian carp (not silver crucian carp) is less than 1 liang in a year. The eggs hatch in spring, and small crucian carp, the size of a fingernail, can be seen in the rivers in the north from March to April. In the summer of June to July, crucian carp can grow to less than one finger long, and become fatter in autumn. Generally, due to artificial fishing, food chain circulation, water pollution and other conditions, less than 15% of the crucian carp hatched in the same year will remain the next year, or even lower. A wild crucian carp of 3 years old can grow to 2-3 liang in weight for a large one, and only weigh more than 1 liang for a small one.

It's enough to give birth to a baby with a piece of tissue as big as three fingers!

6. How many eggs can a crucian carp lay at one time? In which month does the crucian carp lay eggs?

answer

The amount of eggs laid by crucian carp that has just reached sexual maturity can exceed 10,000 per time, and the amount of eggs laid by crucian carp that has reached 5 years old can exceed 100,000 per time. The specific amount varies depending on the species. After spawning, the hatching time of the eggs will be affected by the water temperature. When the water temperature is 15-20°C, it will take about 5-7 days to hatch. When the water temperature exceeds 20°C, it will take about 4-5 days to hatch. When the water temperature reaches 20-25°C, it will take about 2-3 days to hatch.

1. How many eggs can a crucian carp lay at one time?

1. The amount of eggs laid by crucian carp depends on its age. A crucian carp that has just reached sexual maturity can lay more than 10,000 eggs at a time, and a 5-year-old crucian carp can lay more than 100,000 eggs at a time. The specific number will also be affected by the species.

2. After the crucian carp lays eggs, the eggs will hatch in about 3-7 days. The specific hatching time varies depending on the water temperature. When the water temperature is 15-20°C, it takes about 5-7 days; when the water temperature exceeds 20°C, it takes about 4-5 days; when the water temperature reaches 20-25°C, it takes about 2-3 days.

3. It takes about 1-2 days for crucian carp to complete one spawning. Crucian carp can spawn twice in each breeding season. After each spawning, it needs to rest for about 30 days (or several months) before the next reproduction.

4. The reproduction frequency of different species of crucian carp varies. Red crucian carp can reproduce 3-4 times a year, and can lay eggs once a month after entering the breeding season.

2. In which month does crucian carp spawn?

1. Spawning time

Crucian carp usually starts spawning in March and April every year, and the spawning time in different regions will be affected by the climate.

2. Eating habits

(1) Wild crucian carp like to travel in groups and live where they choose their food, and their foraging time changes with the seasons.

(2) In spring, the appetite is stronger, and the birds will forage for food day and night. In summer, they mainly forage in the morning, evening, and night. In autumn, they forage throughout the day, and in winter, they mainly forage around noon.

(3) In the southern region, wild crucian carp can feed all year round. In the northern region, wild crucian carp stop feeding from December to March of the following year.

3. Food Type

(1) Animals: mainly rotifers, clams, shrimps, bryozoans, cladocerans, copepods, chironomid larvae and other organisms.

(2) Plants: mainly leaves, buds, stems, fruits and plant debris of aquatic plants.

(3) Others: including diatoms and filamentous algae.