Eel lays eggs several times a year, how long does it take for juveniles to reach adulthood, thank yo

In general, the sexual reversal of yellow eels is irreversible, except that a female becomes a male. The number of spawning of yellow eel is not fixed, and there are two main situations: one is that after sexual maturity, yellow eel begins to spawn in May within a year, but the ovaries.

It is relatively long, the maturity period is different, and some yellow eels can produce about 20 grains each time 4 times a day in a year. Second, some eels do not have an immediate reversal of sexual maturity, and a very small number of eels are still females in the second or even third year.

sexual, eggs can be laid as usual.

From knowing.

Eel fry can grow into eel fingerlings after 150 to 180 days of rearing, and eel fingerlings can reach adult eels after 150 to 180 days of rearing!

In other words, eels that breed in May and June of that year can grow to about 15 cm by December, and after 6 months of rearing the following year, they can grow to about 100 to 150 grams of adult eels by October, November, and December!

The following points should be paid attention to in captivity:

Eel stocking should be in April, May, or August to September to avoid the sexual maturity and breeding period from mid-May to July. The most suitable temperature for eel growth is 24 to 28 degrees Celsius.

Feeding should be timed, eels are out at night during the day, and it is advisable to feed at 6 p.m. and 8 p.m. The feed should be fresh, and the feed with freighty mold should not be put in. The feed should be washed before it is put in, and each cubic water body should be soaked with 3 to 5 grams of salt for 10-20 minutes, and then rinsed with water before feeding.

Generally, small trash fish in freshwater are selected, and the daily bait quantity is 3%-5% of the total weight of the yellow eel in the cage.

When feeding in captivity, due to the feeding of a large amount of feed, the feces excreted by the yellow eel are easy to pollute the water quality, so it is necessary to add new water frequently to keep the water fresh. Change the water every 7 days and 10 days in the spring, and change the water every 3 days and 5 days in the summer. The cage should also be disinfected regularly, with 10 grams of bleached powder water per cubic meter of water, and the whole pool should be splashed.

After stocking, an appropriate amount of loaches can be stocked in the cage, and the habit of upstream and downstream of the loaches can be used to divert and increase oxygenation, and the residual bait of the yellow eel can be eliminated. A certain amount of silver carp is stocked in the pond to regulate the water quality. Clean the cage in a timely manner to remove excessive debris and attached algae, and keep the water exchange inside and outside the cage unimpeded.

It is better to place aquatic plants, water hyacinths and water peanuts in the cage to provide a good place for the growth and habitat of yellow eels. When transplanting water peanuts, it is best to remove the roots and wash them and soak them in 5% salt water for about 10 minutes to prevent locusts and other pests from being brought into the box with the grass.

Yellow eel seedlings should be strictly disinfected before entering the box, especially in July and September, when yellow eels are prone to disease, every 20 days with 1ppm bleaching powder is splashed on the whole box, and the sick eels are found to be isolated in time. Detect diseases and prescribe the right medicine in time to minimize losses.

Fishing: In December, when the water temperature drops below 12 degrees, the feeding and growth of the eel basically stops. At this time, the eels in the cages are captured and marketed. So, catch it in December.

Paddy field yellow eels are fed with earthworms and can be sold in 3 and 4 months.

Throw a few straw mats on the wet ground and place about 30 earthworms.

Harvested once a week.

If you get bigger, you can sell it.

The growth rate of eel is very slow, and the annual eel can only grow to four taels or half a catty at most, less than 30 centimeters, usually more than 20 centimeters, even if you have high breeding skills.

Yellow eel is eel.

Eels belong to the order Gillfish, the family Gillfish, and the genus Eel. It is also known as yellow eel, squid, eel, snake fish, white eel, blood eel, common fish, [1] long fish (in northern Jiangsu). It is a collective name for about 15 species of elongated eel-shaped fish in the order Gillfish.

There are two kinds of distribution in China, one is the common yellow eel, and the other is the mountain yellow eel, which is only distributed in Longchuan County, Yunnan, and is not distributed in other parts of the country.

The body length of the young eel just out of the membrane is 27-44 cm, the body length of the first winter eel can reach 45-66 cm, and the body length of the large yellow eel can reach 70-80 cm, and the weight is more than kilogram.

Yellow eels can grow 2 to 4 times longer in a year.

<> eels usually only reproduce once a year, but they are pregnant once, spawning in batches, and their spawning time is longer, 1-3 times, and each time they can lay 300-800 eggs. Although the number of spawning of yellow eel is more, the total number of spawning will not increase, so in the actual breeding process, yellow eel can be allowed to take oral oxytocing drugs to make them concentrate on spawning for a period of time, so as to facilitate centralized cultivation and management.

1. How many yellow eels breed once a year

1. Under normal circumstances, the yellow eel will only reproduce once a year, but its spawning cycle is relatively long (once pregnant eggs, spawned in batches), its spawning times are 1-3 times, and the spawning volume is about 300-800 each time.

2. According to practical observation, about 80% of yellow eels will only lay eggs once, about 20% of yellow eels will lay eggs twice, and very few yellow eels will lay eggs three times.

3. Although the number of spawning of yellow eel is large, the total amount of spawning will not increase, so in the actual breeding process, they can be concentrated in a period of time by letting yellow eel oral oxytocogenic drugs, so as to increase the batch of eel seedlings, which is convenient for centralized cultivation and management.

4. The eggs of the eel are larger, the color is golden yellow, the elasticity is sufficient, and the egg diameter is about 2-4 mm. When laying eggs, the broodstock eel spits foam into the hole and accumulates into a clump, and if the number of eggs is small, the eggs are not laid in the foam, but in the nest, and the eel seedlings can hatch after about 7-8 days.

2. When is the breeding season of yellow eel?

1. The breeding season of the yellow eel is related to the region where it is located, and the breeding season of the yellow eel in different regions is different.

2. In the middle and lower reaches of the Yangtze River, the breeding time of yellow eel is generally concentrated in May to September, and June to July is the peak breeding period. In the area north of the Yellow River, the breeding time of yellow eel is generally concentrated in June and September, and July and August are the peak breeding season. In the waters of the Pearl River, the breeding time of yellow eel is generally concentrated in April and July, and the peak breeding season is from May to June.

3. The spawning period of yellow eel in paddy field will change with the change of water storage time, in February and March, the mat grass field, lotus root field, and white field of water storage, among which the yellow eel will generally start spawning in mid-May, and the peak period of spawning traces in early June is the peak of spawning. In the rice-wheat rotation fields that start to store water in early June, the yellow eels generally start spawning in early June, and the peak spawning season is in early July.

4. In Wuhan, the breeding season of yellow eel is generally from the beginning of June to the end of August, and two batches of eggs can be laid in one year, and the first batch of eggs is generally from the beginning of June to the middle of July, and the peak period of spawning is from June 7 to 30; The second batch of spawning is generally from the beginning of August to the end of August, and the interval between the two spawns is about 2 months.

Yellow eels only breed once in their lives, from May to July, from the south to the north in turn, the yellow eels will have a sexual reversal, when they are small, they are all females, and after breeding once, they all become males.

Characteristics of yellow eel:

1. The yellow eel has only one vertebrae in the whole body, and there is no intermuscular spines;

2. The peritoneal membrane is brownish-black. The intestine is short, not coiled, shorter than the body length, and has similar characteristics as carnivorous fish;

3. There is a narrowing place in the middle of the intestine, which divides the intestine into the foregut and hindgut;

4. There is no swim bladder (i.e., fish bubble) in the body, so the yellow eel cannot stay in any water layer like other fish. The gills, oropharyngeal cavity and ** of the yellow eel all have respiratory functions, and can directly breathe the air in nature, so it can be out of the water for a longer time than the holding of tung tong without dying;

5. The gill filaments of the yellow eel are very short, and when the water temperature is high in summer and the metabolism of the yellow eel is vigorous, the yellow eel often sticks its head out of the water, and He Pi Sou opens his mouth to inhale air, relying on the oropharyngeal cavity to breathe directly; When the yellow eel hibernates at low temperature in winter, it mainly relies on ** for weak breathing;

6. The heart of the yellow eel is far from the head, about 5 cm behind the gills.