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Male and female identification and reproduction of zebrafish.

It is not difficult to distinguish between male and female zebrafish: male zebrafish have a slender body, large fins, yellowish body color, brownish-yellow anal fins, and prominent stripes; The female fish has a fatter body, a lighter body color, a bluish tinge, a pale yellow anal fin, and an obvious abdominal expansion during the egg-bearing stage.

Zebrafish is an oviparous fish that enters sexual maturity at the age of 4 months, and generally reproduces well with 5-month-old fish.

It is relatively easy for zebrafish to reproduce. Water requirements for reproduction, hardness 6-8, water temperature 25-26 degrees Celsius. Zebrafish prefer to eat their eggs on their own, so small stones and aquatic plants are laid in the breeding tank to facilitate the attachment of eggs.

When breeding, it can be prevented from entering the breeding tank according to the ratio of 1:2 between male and female, and it is generally prevented from entering the first night, and the eggs can be spawned and fertilized at noon the next morning. After sovvulation, the breeding fish should be fished out and raised.

A female can ovulate between 300 and 1000 eggs at a time.

After 2-3 days, the fertilized eggs can hatch larvae, and then after 2 days, the larvae begin to swim and feed, and they can be fed with "water" at first, and after 10 days, they can be fed other small fish and insects.

The breeding cycle of zebrafish is about 7 days, and it can reproduce continuously 6-7 times a year, and the spawning is high.

The reproductive cycle refers to: the time interval between each spawn! This time interval is generally around 15 to 30 days! In the vast majority of cases, it's 30 days! It generally takes about three months to start rearing zebra larvae.

Zebrafish are highly adaptable and can be used from weakly acidic to neutral water.

The difference between male and female zebrafish is more obvious.

The male fish has a slender body, relatively long fins and limbs, and the colors are also more gorgeous;

Females have a swollen abdomen and relatively short flippers.

Preparation of the breeding tank:

Smaller aquariums can be used for zebrafish breeding tanks.

Since zebrafish eggs are non-sticky, heavy eggs, and zebrafish eat their eggs like other carps, the bottom of the aquarium should be covered with something to conceal the eggs.

You can make lattices from glass one by one and put them in the breeding box, each compartment is about 10 cm 10 cm.

In this way, multiple pairs of broodstock can be placed together to spawn and then hatched at the same time, and the larvae can be fed and managed at the same time.

After the broodstock is in the tank, as long as the water temperature is right, it will soon start to tail up and spawn.

After spawning, the broodstock should be fished out immediately.

If multiple pairs of broodstock breed at the same time, the glass lattice should be removed after all the broodstock have spawned.

Fertilized eggs hatch in 2 to 3 days.

Newly hatched juveniles are hung on the glass wall of the breeding tank to absorb the nutrients in the yolk sac.

After about 2 days, it will swim freely and can start feeding the egg yolk water.

— Zebra is an oviparous fish that reaches sexual maturity in about 4 months, and 5 months is preferred. The water temperature suitable for red zebra is 20 ° to 23 °C, the fluorescent zebra fertilized eggs can hatch larvae after 2 to 3 days, the fertilized eggs are transparent for successful fertilization, milky white is a failure, and the breeding and spawning rate ranges from 300 to 1000, 6 to 7 times a year. Yuzhen Rumiao Jingsheng began to feed the harvest shrimp on the 4th and 5th.

and other kinds of open feed. The yellow water of the egg royal draft is easy to cause muddy water, so you need to pay attention to it. After 10 days, the larvae were fed small fish insects.

Zebrafish fry. <>

Transparent zebra.

Zebrafish eggs can hatch on their own, and the mother can be isolated after spawning, and the eggs can hatch on their own as long as the temperature is right. The time for the eggs to hatch is determined according to the water temperature in the tank, the water temperature is about 24 degrees, and it can be hatched in about 2-3 days, and the water temperature is about 28 degrees, and it can be hatched in about a day. Hatched zebrafish can be kept in a separate container for easy control of water temperature and quality.

Zebrafish eggs hatch on their own. During hatching, the feeder can remove the whitish eggs first, as these are unfertilized eggs or have died. Normal eggs are transparent in color, with a membrane on the outside and a small white spot in the middle.

Only this egg can hatch successfully. The keeper regulates the water temperature to between 24-28 and after 2-3 days they are ready to hatch.

1. Feeding: Zebrafish do not need to be fed in the first three days after hatching, because the nutrients they bring from their mothers are enough for them to absorb. After three days, you can feed less egg yolk water and feed 5-7 times a day.

Wrap the egg yolk in gauze and shake gently in water. Feeding a little bit at a time is fine, and eating as few meals as possible can promote the development of the zebrafish's digestive system.

2. Water temperature: The newly hatched small fry are still relatively fragile at this time, and the water temperature is best controlled at 23 degrees. Change the water every day, and there should be no temperature difference when changing the water. The amount of water change should not be too much at a time, a quarter is enough.

3. Water quality: The small fry of zebrafish do not have too high requirements for water quality, and only need to have low hardness and clear and clean water. It is best to change the water every day for a week after the hatching of the small fry. Not only can the water quality be maintained, but also the amount of dissolved oxygen in the water can be guaranteed.

Zebra females do not need to hatch eggs after spawning. Fish hatch on their own at the right temperature. Its incubation time is relatively short.

In the absence of external interference, small fry can be born after 2 to 3 days. If the temperature rises, it can be accelerated to incubate. When the temperature reaches 28, it is ready to be born after about 36 hours.

It is also possible to place the eggs in an incubator to control the temperature and shorten the incubation time. <

Once the zebrafish eggs are laid by the broodstock, they do not need to be hatched by the female. At the right temperature, the eggs hatch on their own. The incubation time of zebrafish eggs does not last long, and small fish can hatch in 2 to 3 days.

However, depending on the temperature, the incubation time may be extended or shortened. If the water temperature can be controlled at 24 , the eggs will hatch in 2 to 3 days. If the temperature is higher, it can reach 28 hours, and the incubation time can be shortened by about half.

After about 36 hours, the fry are born. In addition to this natural incubation, the eggs can also be placed in an incubator. In the incubator, the temperature can be kept constant to avoid the interference of external factors, which is conducive to the healthy birth of small fry.

1.Temperature: Although zebrafish are able to adapt to a wide range of temperatures. However, newborn fry are very fragile, so it is important to let them grow at the optimal temperature. It's best to keep the temperature between 20 and 23.

2.Water quality: It has very low requirements for water quality. Just raise it with neutral water with clean water and low hardness.

3.Feeding: Newly hatched small fish are not fed. Wait 2 to 3 days before you need to feed it. In order to meet the nutrients needed for the growth of juvenile fish, fish insects, earthworms, mealworms and other foods with high protein content can be used when feeding.

Water temperature: Newly hatched zebrafish are fragile, and keepers need to ensure that the water temperature in which they live is warm and stable. You can use a heated solder stick to keep the water temperature between 24-26.

Water quality: Zebrafish have low requirements for water quality, and keepers only need to choose clean and refreshing neutral water to breed them. Oxygen:

Zebrafish like to grow in an oxygen-rich environment, and keepers need to give them regular oxygen to ensure that they have enough oxygen. <

1. Water temperature: The newly hatched zebrafish are relatively weak, and the keeper had better install a heating rod for them to ensure that their water temperature is constant. Breeders can adjust the temperature of the heating rods to between 24-26, as this is the temperature range in which they grow optimally.

2. Water quality: Zebrafish do not have high requirements for water quality, and as long as the keeper ensures that the water quality of their life is clean, they can grow normally. However, newborn zebrafish are sensitive to fluctuations in water quality, and keepers try not to change the water during the first 7 days of their birth.

Moreover, they have just been born, and the source is on the small side, so the keeper should not open the filter to avoid them being sucked away.

3. Oxygen: Zebrafish have a high demand for oxygen, and breeders need to install an oxygen pump for them to ensure that the oxygen in the water is sufficient.

Newly hatched zebrafish do not need to be fed immediately, because they carry enough vitelline in their bodies to absorb it for 2-3 days, so it is best for keepers to wait 3 days after they are born before feeding them some highly nutritious, easily digestible food.

The foods that are more suitable for small zebrafish to eat are shrimp eggs, daphnia, small fish insects, migratory water, paramecium, cooked egg yolk, etc., which are nutritious and easy to digest, which can ensure that their nutrition is sufficient.

Zebrafish generally hatch small fish in about 2-3 days, but the specific hatching time is still judged by the water temperature in the fish tank. If the water temperature of zebrafish hatching is 24, then it will take 2-3 days for them to hatch. If the water temperature of the zebrafish hatching is 28, the incubation time is only about 36 hours.

Although the higher the temperature, the faster the hatching, but if the water temperature exceeds 28, the eggs may not hatch successfully.

Zebrafish eggs usually hatch in 2-3 hours. The specific incubation time also depends on the water temperature in the fish tank. Generally keeping the water temperature at 24 hours, it takes 2-3 days for them to hatch successfully.

The water temperature is 28 o'clock, and the incubation time is only about 36 hours. Although the higher the temperature, the shorter the incubation time, if the incubation temperature exceeds 28, the eggs will not hatch successfully. During the incubation period, in addition to ensuring the water temperature, it is also necessary to ensure that the water quality is clean, otherwise it will also reduce the chance of successful incubation.

1. Water temperature: zebrafish small fish are just born, not adapted to the new environment, the keeper needs to keep the water temperature at about 23, if possible, you can install a heating rod to ensure that the water temperature is constant.

2. Water quality: Zebrafish does not have too high requirements for water quality, as long as the water quality is clean and refreshing. It is best to change the water for raising small fry once a day, and the amount of water change each time can be controlled at one-fifth of the total water volume.

3. Feeding: Newborn baby zebrafish do not need to be fed, they will carry some nutrients themselves, and the keeper can wait for their nutrients to be absorbed before feeding food. Breeders can feed small fry with some shrimp eggs, egg yolk water, etc.

After they are born for a week, they can be fed some bloodworms, mealworms and other foods.