How old is the crucian carp to lay eggs? How many days will it take to float a small fish?

Crucian carp, referred to as crucian carp, commonly known as crucian carp melon seed, crucian carp, soil crucian carp, after artificial breeding and breeding, can produce many new varieties, so how big does crucian carp lay eggs? How many days will it take to float a small fish? According to Mr. Zeng, a farmer, the gonads of crucian carp mature earlier than other fish, and the fish can lay eggs the next year and grow a head at the same time. One-year-old crucian carp can lay eggs. And the spawning period is long, lasting from spring to autumn, laying a large number of eggs, laying eggs on aquatic plants or other objects in shallow waters. The strong reproductive ability of crucian carp is an important reason for its wide distribution and large quantity. In addition, crucian carp still look for food during spawning, which is different from other fish.

How many days will it take to float a small fish?

Generally speaking, it takes 7 days from fertilizing the eggs to hatching. If the average water temperature is 15 ℃, the hatching time will be 7 days; when the average water temperature is 20 ℃, the fish can be hatched in 5 days; when the average water temperature is 20 ℃, it will only take 3 days. In short, the lower the water temperature, the longer the incubation time.

Culture technology of crucian carp

1. Pond condition

Crucian carp have the habit of clustering, diving into the mud and jumping against the current. The pond area of the main culture crucian carp should not be too large, generally about 2 mu is appropriate, should not exceed 4 mu; the pond bottom is required to be hard, generally the silt thickness is less than 10 cm, and the silt must be cleared when it exceeds 10 cm, so as to facilitate the fishing of crucian carp; the ridge is solid and does not leak, and the inlet and outlet should install a firm and reliable fish fence, which should be 50 cm higher than the highest water level of the pond.

two。 Variety selection

At present, there are many varieties of crucian carp on the market, so it is inevitable that the good and the bad are intermingled. Practice has proved that allogenic silver crucian carp and high back shape allogenic silver crucian carp (high back crucian carp) are suitable for main culture, and their growth rate is 2 times and 3 times faster than that of common crucian carp respectively. Allogenic silver crucian carp is similar to high-backed crucian carp. The differences between allogenic silver crucian carp and common crucian carp are as follows: the lateral linear scales of allogenic silver crucian carp and common crucian carp are 31 and 28 respectively, and the number of lateral linear scales of allogenic silver crucian carp is the same as that of high-backed crucian carp, but the head of high-backed crucian carp is short, the back is high and the body is thick, and the abdomen is round.

3. Stocking density

From the point of view of the economic benefit of culture, although the stocking quantity is more than 2000 fish / mu, although a higher yield can be obtained, the individual of cultivated commercial fish is small, the sales price is low, and the benefit is not ideal; the stocking quantity is less than 1000 fish / mu, although the individual commercial fish is larger, but the total yield is not high, and the sales income is low. 1400 fingerlings with a weight of 30 grams per mu or 1200 fingerlings of 50 grams per mu, with an appropriate amount of silver carp, bighead carp and summer grass carp, with a total number of no more than 600. the net yield of crucian carp is more than 500kg and that of other fish is about 200kg.

4. Water quality management

The content of calcium and phosphorus in crucian carp is more than twice that of other fish, so it is necessary to have abundant calcium and phosphorus in water to meet the physiological needs of crucian carp. It is required to apply quicklime solution once in 20 days, with a dosage of 60 kg per mu, and calcium superphosphate every 15 days with a dosage of 15 kg per mu. Calcium superphosphate can not be applied until 5 days after the application of quicklime to prevent excessive alkalinity of the water and reduce the effect of phosphate fertilizer.