CATDOLL : CATDOLL: How do goldfish reproduce and how often do they reproduce?

1. How do goldfish reproduce and how often do they reproduce?

Goldfish reproduce by laying eggs and fertilizing them. Goldfish need a suitable water temperature to reproduce, generally 18-25℃ is more suitable, so goldfish reproduce in the warm spring. In addition to the water temperature, goldfish reproduction also requires that both male and female fish reach the age of reproduction. In addition, the ratio of male to female fish is preferably three to one. After the female fish lays eggs, the male fish will ejaculate for it. After about a week, the young fish will hatch.

1. How do goldfish reproduce? Goldfish reproduce by laying eggs and fertilizing them. When goldfish reproduce, they need a suitable water temperature, generally 18-25℃ is more suitable, so goldfish usually reproduce in the warm spring. When goldfish reproduce, in addition to the suitable water temperature, both male and female fish must reach the appropriate age for reproduction. Generally, male fish are suitable for reproduction at 1-2 years old, and female fish are more suitable for reproduction at 2-4 years old. If you help goldfish reproduce artificially, you should add high-protein bait to the goldfish of the right age in advance to supplement the nutrition for the goldfish and prevent the goldfish from getting sick.

During breeding, there should be more male fish, with a ratio of about 3:1 between male and female fish, so that the eggs can be fertilized better. During the breeding period, the male fish will chase the female fish and touch the female fish's abdomen. When the female fish ovulates, the male fish will fertilize it immediately. After that, the parent fish should be removed and raised to prevent the parent fish from eating the young fish. After a week, the young fish will hatch.

2. How often do goldfish breed? Theoretically, when a goldfish grows to one week old, it begins to have the ability to reproduce, and its reproductive system will gradually mature. The breeding interval of goldfish is relatively short, and it can breed almost once a year.

2. Are goldfish viviparous or oviparous? How do they reproduce?

Goldfish are oviparous animals. Most ornamental fish are oviparous animals, and only a few are ovoviviparous animals. When goldfish reproduce, the female fish will first lay eggs, and then the male fish will come forward to ejaculate, so that the eggs will become fertilized eggs and hatch into small fish. Viviparous animals are different. They are generally fertilized in the body, and the embryo needs to mature in the mother's body before it is born. Viviparous animals give birth to fetuses.

1. Are goldfish viviparous or oviparous? Goldfish are oviparous. When they reproduce, the female fish lays eggs first, and then the male fish comes forward to ejaculate, so that the eggs can become fertilized eggs. Fertilized eggs need to be incubated for a period of time before they can become small fish. Generally, oviparous animals do not have the habit of protecting their young, and goldfish may eat the eggs after giving birth.

The reproduction method of viviparous animals is different. First of all, they are fertilized internally. After the egg is fertilized in the body, it will develop into an embryo. The embryo needs to develop successfully in the mother's body before it can leave the mother's body. Viviparous animals give birth to fetuses. Viviparous animals breathe with lungs and secrete milk. They will take care of their cubs until the cubs are able to find food, and then they will give up protection.

2. How to breed goldfish Goldfish mature within 1-2 years after birth, and they will breed every spring after adulthood. During breeding, the male fish will constantly chase the female fish. If the female fish accepts the pursuit of the male fish, they will chase each other. During the chase, the female fish will lay eggs, and the male fish will immediately come forward to ejaculate, and the eggs will become fertilized eggs. After the goldfish have finished breeding, the breeder needs to fish them out as soon as possible to prevent them from eating the eggs. The eggs can generally hatch in about 3-7 days in a comfortable environment.

3. How to breed goldfish

1. Breeding season

The breeding season for goldfish is between spring and summer every year. The southern part of my country is 1-2 months earlier than the northern part, spawning in March and April in the south and from the end of April to the end of June in the north.

2. Environmental preparation

Keep the water fresh and ensure that there is enough oxygen. There should also be enough light, and the aquarium should be placed in a well-ventilated and sunny place.

3. Prenatal preparation

Under natural conditions, goldfish lay eggs on water plants. The eggs are sticky and stick to the water plants to hatch after they are laid into the water. Therefore, we need to artificially create spawning conditions for goldfish in the fish tank by putting some water plants.

4. Egg laying

When the male fish always chases and bites the female fish's tail, it is about to lay eggs. The pair of fish should be placed in a separate fish tank. Put the prepared fish nest in the fish tank so that all the fish eggs can be collected. Place the water plants with milky white fish eggs in the fish tank with fish water (preferably a clay tank) and place it in a place where the sun can shine. In the place where the sun shines, the small fish will hatch in about a week.

5. Post-production preparation

After the goldfish finishes laying eggs, the female and male goldfish should be taken out and raised separately in time. The female fish that has laid eggs should not be raised together with any male fish for the time being. Let it get enough rest and recuperation to protect the female fish.

Additional information:

There are two methods for artificial insemination of goldfish. It can be done with water or dehydrated.

1. Insemination with water: Use a large shallow white basin with a half depth of clean, dried tap water, and put an appropriate amount of duckweed or foxtail algae bundles to float in the water.

Then, hold up the determined standard broodstock in the water with your left and right hands, let their cloaca face each other, and gently squeeze the abdomen of the male broodstock with your thumb to squeeze out the milky white semen. At the same time, the thumb of the other hand also gently squeezes the abdomen of the female broodstock to squeeze out the mature eggs.

Sperm and eggs complete the fertilization process in the water, and the fertilized eggs will immediately adhere to the water plants. In order to ensure the normal hatching of the fertilized eggs, the water plants attached to the fish eggs should be immediately moved to another water body with better conditions to hatch the fry.

2. Out-of-water fertilization method: Take out a pair of male and female broodstock that have determined the standards, wipe the fish bodies dry with soft gauze, gently press the male fish's abdomen with your thumb, squeeze out the semen and put it in a dry glass container, then quickly squeeze the female fish's abdomen with your thumb to squeeze the mature eggs into the glass container containing the semen.

At the same time, take a dry feather and stir the sperm and eggs together. Then pour the fertilized eggs onto the fish nest. The fertilized eggs will become sticky when they meet water and will immediately stick to the water plants and then be sent to hatch. In out-of-water fertilization, the semen of one male fish can fertilize the eggs of multiple female fish, which can fully save the amount of male fish.

References:

Baidu Encyclopedia--Goldfish

spawning.

The breeding season for goldfish is between spring and summer every year. The southern part of my country is 1-2 months earlier than the northern part, spawning in March and April in the south and from the end of April to the end of June in the north.

Goldfish usually mature and lay eggs in one year, which means they can reproduce one generation in one year. If the temperature is raised in winter and the feeding and management are strengthened, goldfish can lay eggs in advance when they are 7-8 months old in the cold winter.

Additional information:

Under normal circumstances, goldfish with well-developed gonads can naturally mate and lay healthy fertilized eggs. However, when people want to crossbreed new species, or when there are many female fish of a certain species and only one or two male fish, we can use artificial insemination to breed goldfish.

Artificial insemination can make up for the shortcomings of natural fertilization, greatly improve the utilization rate of sperm and eggs, and consciously and targetedly cultivate new varieties of superior quality according to production needs.

Reference: Goldfish - Baidu Encyclopedia

Goldfish(Details)

It is not very difficult to breed goldfish at home, but you need to pay attention to the environmental issues during the breeding period. The water temperature should be controlled at 14-28℃ as much as possible, and the water should be changed at least once a week. If the breeding period of goldfish happens to be the winter, you must prepare nutritious and fresh bait.

Male and female pairing: The pairing of male and female broodstock must be reasonable, and the combination must be timely to ensure smooth spawning of broodstock and improve fertilization rate. The best male-female ratio is 2:3, and at the same time, the broodstock that were originally cultivated separately and reached sexual maturity should be combined 3 days before the birth.

Control the water temperature. The best breeding water temperature for goldfish is 18℃. When the water temperature is lower than 10℃ or higher than 29℃, the spawning process of goldfish will be interrupted. When the water temperature reaches between 28℃ and 14℃, the sexually mature broodstock will gradually enter the estrus and spawning period. In order to extend the breeding period, during the breeding season of goldfish, various measures should be taken to control the water temperature within an appropriate range. At the same time, it is necessary to prevent the water temperature from rising or falling suddenly, especially during the process of temperature change and water change, and pay special attention to the water temperature control so that the fluctuation range is controlled within 4℃.

Weather changes directly affect the spawning of goldfish. The clear and crisp weather in autumn can stimulate and stabilize the sexual desire of the parent fish, thus promoting their large-scale spawning. On the contrary, low temperature, low pressure, and sultry weather will inhibit the spawning of parent fish. Therefore, you should pay close attention to weather changes and choose the best weather for breeding.

Adjusting the water quality at a suitable water temperature and constant water quality will stabilize the sexual desire of the broodstock and thus delay spawning. By changing the water and accelerating the water change density, the broodstock can be stimulated by the new water to become excited and spawn in large quantities.

Moderate stimulation can stimulate the sexual desire of the broodstock and encourage them to lay eggs in large numbers. Physiological stimulation is stimulation of the opposite sex. During the breeding season, female broodstock will secrete hormones to lure male fish, and male fish will chase and hit female broodstock, prompting both parties to reach excitement and complete spawning and fertilization. Physical stimulation method: First, slight fluctuations in water temperature can stimulate broodstock to lay eggs; second, sudden slight changes in weather can indirectly stimulate sexual desire; third, changing the water environment to stimulate; fourth, placing artificial fish nests to stimulate.

Currently, in the process of breeding goldfish, they are generally allowed to give birth naturally or under artificial observation. When the goldfish are found to be in estrus, they are immediately taken out of the water and artificially squeezed to help them lay eggs and fertilize.

However, using this method of "assisted breeding" does not actually help much in improving the fertilization rate of goldfish, and it is also very harmful to the bodies of the "parent fish."

Tang Jianqing from the Freshwater Fisheries Research Institute said that, generally speaking, if you want to artificially breed goldfish, you should start selecting the species in winter, and the goldfish that are fortunately selected are the "broodstock". There are particular requirements for selecting the "broodstock" for artificial breeding of goldfish. For example, these pure goldfish should be 2-3 years old; they should be strong and have a body length of more than 10 cm, preferably more than 15 cm; and in terms of appearance, the goldfish's body surface should be smooth, the color should be bright, and the scales and fins must be complete.

The selected goldfish will be well taken care of in the "broodstock" breeding pond. The breeding pond has not only been strictly disinfected with potassium permanganate solution, but also has a very fine mesh to filter the water when it enters. At the same time, in order to ensure the temperature in the tank in winter, the entire periphery is also covered with a plastic greenhouse.

Wear gloves to caress the "brother fish"

Tang Jianqing said that after the "broodstock" are selected, raising them is different from raising goldfish at home.

First of all, these "broodstock" must be raised separately, male and female. Because the water temperature is relatively low in winter, they can only be fed at noon on sunny days, and they must be fed at fixed points every day.

Secondly, the water quality requirements during this period are very high. If you need to observe the condition of the fish in the water, you must wear gloves to prevent contamination of the pool water. It is reported that during this period, experts have to change 1/5 of the pool water every 5-7 days and constantly add oxygen to the water.

In addition, these "broodstock" are also very picky about their food. In addition to protein-containing particles, they also need fresh fish and insects to be mixed with their meals.

While raising these "broodstock", they also need to prepare the "ovaries" for future artificial breeding. Tang Jianqing told reporters that because goldfish spawn after estrus, the eggs will be scattered on the bottom of the pond, causing losses, so they need to artificially create ovaries to allow these eggs to accumulate on top. The ovary material they used in the experiment was made of thin, long and soft willow branches, which were harvested before frost and were steamed and sterilized before use.

Generally speaking, the belly of female fish is bigger during the spawning period, while the belly of male fish does not change much. However, it is not difficult to find out by careful observation that there are several small white spots on the hard bone spurs in front of the left and right front fins of male fish, which are more obvious during the spawning period, while female fish absolutely do not have them. In addition, during the spawning period, male fish always chase and bite the tail of female fish. At this time, it is about to spawn. This pair of fish should be placed in a fish tank alone, and a little more water plants should be put in the tank so that the spawned fish eggs can adhere to the water plants, otherwise the fish eggs will sink to the bottom of the water and be eaten by fish. After spawning, female fish should not be mixed with any male fish for the time being, so that it can fully rest and recuperate to protect the female fish. Put the water plants with fish eggs in a fish tank with fish water {preferably a clay tank}, and put it in a place where the sun can shine. The breeding season of goldfish is at the turn of spring and summer every year. The southern part of my country is 1-2 months earlier than the northern part. In the south, spawning is between March and April, and in the north, spawning is from the end of April to the end of June. Goldfish usually mature and lay eggs in one year, which means they can reproduce one generation in one year. If the temperature is raised in winter and the feeding and management are strengthened, goldfish can lay eggs in advance when they are 7-8 months old in the cold winter, and they do not have to wait until one year (12 months old) to lay eggs and reproduce. Goldfish can lay eggs many times during the breeding season. They lay eggs about once every one or two weeks, and can lay eggs 2-3 times. In the place where they are exposed to light, small fish will hatch in about a week. The gender of goldfish can change. For example, if two all-female fish or two all-male fish are raised together, after a period of time, one will become a female fish and one male fish.

Artificial insemination of goldfish

Under normal circumstances, goldfish broodstock with well-developed gonads can naturally mate and lay healthy fertilized eggs. However, when people want to crossbreed new varieties, or when there are many female fish of a certain variety and only one or two male fish, we can adopt artificial insemination to breed goldfish. Artificial insemination can make up for the shortcomings of natural fertilization, greatly improve the utilization rate of sperm and eggs, and consciously and directional cultivate new varieties of superior quality according to production needs. There are two methods for artificial insemination of goldfish, which can be carried out with water or dehydrated. ① Insemination with water: Use a large-mouthed shallow-bottomed white basin, fill it with 1/2 deep clean and air-dried tap water, and put an appropriate amount of duckweed or foxtail algae bundles to float in the water. Then, hold the determined standard broodstock in the water with both hands, let their cloaca face each other, and gently squeeze the abdomen of the male broodstock with the thumb to squeeze out the milky white semen. At the same time, the thumb of the other hand also gently squeezes the abdomen of the female broodstock to squeeze out the mature eggs. Sperm and eggs complete the fertilization process in the water, and the fertilized eggs will immediately adhere to the water plants. In order to ensure the normal hatching of the fertilized eggs, the water plants attached to the fish eggs should be immediately moved to another water body with better conditions for hatching. ② Out-of-water fertilization method: Take out a pair of female and male broodstock that have been determined, wipe the fish body with soft gauze, press the male fish's abdomen lightly with your thumb, squeeze out the semen and put it in a dry glass container, then quickly squeeze the female fish's abdomen with your thumb to squeeze the mature eggs into the glass container containing semen. At the same time, take a dry feather and stir the sperm and eggs. Then pour the fertilized eggs on the fish nest. The fertilized eggs will become sticky when they meet water, and will immediately adhere to the water plants, and then be sent for hatching. Out-of-water fertilization, the semen of one male fish can be used to fertilize the eggs of multiple female fish, which can fully save the amount of male fish.