CATDOLL : CATDOLL: Can domestic red crucian carp lay eggs?

Can domestic red crucian carp lay eggs?

Domestic red crucian carp can lay eggs; the estrus and spawning time of crucian carp is generally from the end of March to the beginning of April. When the water temperature is stable at around 18℃, estrus breeding can begin. Red crucian carp is a multiple spawning type. In order to increase the amount of eggs laid and concentrate seed production, induced spawning injections must be performed.

The oxytocin drug is carp pituitary gland or carp pituitary gland plus luteinizing hormone releasing hormone analogue, both of which have good effects. Dosage: 2-3 carp pituitary glands plus 10 micrograms of luteinizing hormone releasing hormone analogue per kilogram of female fish body weight, and half of it for male fish. One injection is appropriate.

The effect time varies depending on the breeding conditions of the female fish and the water temperature. If the gonads are well mature and the water temperature is high, they will go into estrus and chase each other more than 10 hours after injection. If the gonads are not well mature and the water temperature is low, some will need more than 20 hours, and some may even require a second injection.

Additional information:

The feeding and management of red crucian carp:

1. Change water: Change water frequently to increase oxygen, but do not use tap water, because tap water contains chlorine, and red crucian carp will die within a few hours when it encounters chlorine. You can use mountain spring water, lake water, or stream water.

2. Feeding: Daphnia, also known as fish worms or red worms, are brown, reddish brown, green, etc. They live in places with a lot of aquatic plants, but it is best to feed them once; water earthworms, commonly known as red nematodes, live in mud, so when feeding water earthworms to red crucian carp, they must be rinsed repeatedly.

3. Sunlight: Because sunlight can kill bacteria, it is best to put the red crucian carp in the sun for an hour or two to prevent disease. The color will also be brighter and more beautiful.

How to induce spawning and hatching of 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.

(1) Before inducing spawning, various tools should be prepared, such as oxytocin, fish nests (for still water hatching), debonding lead sticks (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 maturity 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, immediately drip the male fish's (or Xingguo red carp's) spiny rock semen into the basin and stir gently with a feather. Let the mixture stand for 1 minute to allow for full fertilization. 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.