CATDOLL : CATDOLL: How to raise freshwater crucian carp?

How to raise freshwater crucian carp?

Breeding technology is the key, and attention should be paid to the following aspects:

Carp pond culture technology: Carp is cultured in ponds using four main methods: polyculture in adult ponds, culture in fingerling ponds, culture in broodstock ponds, and culture in ponds as the main culture. [2]

1. In the fish pond, crucian carp is mixed with silver carp, grass carp, bighead carp, bream, bream, carp and other species. Large-sized fish should be stocked. Stocking time should be early rather than late, that is, winter stocking is better than spring stocking. The stocking density is 150 to 250 per 0.07 hectare of water surface. The stocking size and quantity of other fish are determined according to needs. The requirements for crucian carp breeding ponds are not high, generally 0.1 to 2 hectares, water exploration

A pond of 1.5 meters or more is sufficient. The best pond bottom should have 10 to 15 centimeters of silt. The pond cleaning, disinfection, and basal fertilizer application are all carried out according to conventional methods, and the survival rate can reach about 80%. After about 200 days of feeding, the majority of individuals weigh more than 200 grams, and the yield per 0.07 hectare of water surface is more than 20 kilograms.

2. The area required for raising crucian carp in the pond is 0.1-0.2 hectares, the water depth is more than 1.5 meters, and there is 10-15 cm of silt on the bottom of the pond. The pond with domestic sewage in front of and behind the village is more effective for raising crucian carp. Use quicklime to clean and disinfect the pond one week before stocking the fish, and add water 2-3 days after disinfection. When filling the water, use a mesh to filter at the water inlet to prevent wild fish from entering the pond. For every 0.07 hectare of water surface, 1,500 5.0-6.5 cm crucian carp for wintering or 2,000 large-sized fry hatched in the same year are mainly released, and about 40% (600-800) grass carp, silver carp and bighead carp for wintering are added. The stocking time should be early rather than late. Feed concentrated feed as the main feed on a daily basis, supplemented by fertilization to cultivate water quality. The annual feeding amount of concentrated feed is equivalent to about 2.5 times the expected output of Pengze crucian carp. The system uses fixed-point feeding, and the daily feeding amount is determined according to the growth of the fish, weather, water temperature and the feeding intensity of the fish. Fertilizers or new water are added in time according to the water quality. Under normal management, 200 kg of crucian carp with an average weight of about 150 grams per tail can be obtained in the same year, and about 200 catties of grass carp, silver carp and bighead carp can be obtained. Due to the high proportion of high-quality fish, its net profit is also higher than other breeding models.

3. Cultivate crucian carp in fish fry ponds. Cultivate fish in fish fry ponds for silver carp, grass carp, bighead carp, bream and bream, but not in carp and tilapia fingerling ponds. The required area of ​​the pond for cultivation is 0.1-0.2 hectares, and the water depth is 1.0-1.5 meters. The cleaning, disinfection and basal fertilizer application of the pond are the same as the conventional methods. Cultivate crucian carp in other fish fry ponds, and only the fish hatched in the same year can be released. The stocking time should be early rather than late. Generally, when the fish hatched in the main breeding year are transferred to the pond for wintering fish breeding, the fish hatched in the same year should be immediately released for breeding; the stocking specifications should be large rather than small, and the stocking density is 150-220 per 0.07 hectares of water surface. The stocking quantity, specifications and proportion of other fish hatched in the same year depend on production needs and pond specifications. Crucian carp fry are bottom fish, so they generally do not affect the living space of domestic fish species, and can make full use of the water space. Therefore, the fish hatched in the same year are raised in the fish fry pond, which basically does not affect the stocking density and pond specifications of the main fish species; and because crucian carp mainly feed on residual bait and pond bottom plants and animals in the domestic fish fry pond, there is basically no need to increase the investment of funds and feed. Under normal feeding and management conditions, crucian carp fry are raised in the fish fry pond. After 150 to 180 days of feeding, the annual water size can reach more than 200 grams, and the yield of adult crucian carp can increase by 25 to 40 kilograms per 0.07 hectares of water surface.

4. Cultivating crucian carp in broodstock breeding ponds. In southern my country, artificial breeding of domesticated fish usually ends in mid-May to late May. Postpartum broodstock gonads are in the recovery period. In order to restore the broodstock's physical strength as quickly as possible and promote gonad development, ponds are mostly intensively managed. In addition to arranging broodstock breeding and matching other fish, this type of fish pond also has

200 crucian carps of 5-6 cm can be placed on 0.07 hectares of water surface. Crucian carps are raised in broodstock breeding ponds. The stocking time is generally carried out at the same time as the broodstock. The breeding (cultivation) method is carried out according to the conventional method of the main domestic fish broodstock. The breeding of broodstock must follow the law of their gonadal development. Generally, crucian carps raised in broodstock breeding ponds cannot be caught at the end of the year. They must wait until the next year when the broodstock undergoes pre-spawning intensive breeding. After 250-300 days of breeding, 25-45 kg of crucian carps can be obtained for every 0.07 hectares of water surface, and the average individual weight is more than 200 grams.

How many can I reproduce if I release 20 crucian carps? How big can a crucian carp grow in a year?

Answer 1. Under ideal conditions with sufficient food, no natural enemies, and sufficient living space, a pair of crucian carp can breed thousands of fry a year. However, due to the limitation of living resources, the number of crucian carp breeding is far from reaching the above value. 2. The annual weight gain of wild crucian carp is about 50g; the annual weight gain of crucian carp cultured in ordinary fish ponds is about 150-200g. If the crucian carp is in a high-yield fish pond with sufficient food and proper management, the annual weight gain can exceed 250g.

1. How many can be reproduced in one year if 20 crucian carps are released?

Under ideal circumstances, a pair of crucian carp broodstock can produce thousands of fry a year.

1. Reproduction speed

(1) Crucian carp has a very strong reproductive capacity. Generally speaking, the number of eggs laid by a female fish of one winter age is about 10,000 to 28,000, the number of eggs laid by a female fish of two winter ages is about 20,000 to 59,000, the number of eggs laid by a female fish of three winter ages is about 26,000 to 68,000, and the number of eggs laid by a female fish of five winter ages exceeds 110,000.

(2) The survival rate of crucian carp eggs is low, with a hatching rate of only about 5-10%. In addition, the survival resources of crucian carp in the pond are limited, so the survival rate of crucian carp offspring is very low. However, under ideal conditions with sufficient living space, sufficient food and no natural enemies, a pair of parent fish can generally reproduce thousands of fry a year.

2. Peak spawning period and time required for egg hatching

(1) The peak spawning period of wild crucian carp is generally concentrated in March to May each year, the peak spawning period of high-back crucian carp is generally concentrated in March to April each year, the peak spawning period of Pengze crucian carp is generally concentrated in April to July each year, the peak spawning period of Caohai crucian carp is generally concentrated in March each year, and Qihe crucian carp can spawn all year round.

(2) When the water temperature is around 15-20℃, it takes about 5-7 days for crucian carp eggs to hatch. When the water temperature is around 20℃, it takes about 4-5 days for crucian carp eggs to hatch. When the water temperature is around 20-25℃, it takes about 2-3 days for crucian carp eggs to hatch.

2. How big can crucian carp grow in a year?

1. The growth rate of crucian carp is related to its species and growth environment.

2. If it is wild crucian carp, since the food source cannot be guaranteed, the annual weight gain is about 50g. The annual weight gain of crucian carp cultured in ordinary fish ponds is about 150-200g. If it is a crucian carp in a high-yield fish pond with sufficient food, good water quality and proper management, the annual weight gain can even reach more than 250g.

3. Taking Xiangyun crucian carp as an example, its growth rate is 2-3 times that of ordinary crucian carp. Under normal circumstances, the maximum weight of the fry raised to the end of the year can reach more than 500g, while the maximum weight of the fish raised to the end of the next year can reach more than 1500g.