CATDOLL : CATDOLL: What environment is suitable for raising bighead carp?

1. What environment is suitable for raising bighead carp?

Bighead carp (yōng) is the scientific name of bighead carp, also known as silver carp and bighead carp, one of the four famous Chinese carps.

How to take good care of it? You need to pay attention to the following

1. The feeding habits of bighead carp. In previous data, the feeding habits of bighead carp were defined as mild filter-feeding fish that mainly feed on zooplankton. It was generally simply understood as feeding on zooplankton. This was obtained under low-level aquaculture conditions in the natural environment in the past. Now under high-tech aquaculture conditions, large species dominate the plankton in the water body. Bighead carp is a filter-feeding fish. Its choice of food is determined by the distance between the gill rakers. As long as the plankton is larger than the distance between the gill rakers, it can be filtered by it. According to research, the food of silver carp is mainly plankton with an individual size of less than 50 microns, and the food of bighead carp is mainly plankton with an individual size of more than 50 microns. Under fertile water conditions, plankton is mainly straight-chain diatoms, dinoflagellates, euglena, filamentous cyanobacteria, large rotifers, cladocerans, copepods and other species with an individual size of more than 50 microns, which are exactly the filter-feeding objects of bighead carp.

2. The ratio of silver carp to bighead carp. The traditional ratio of silver carp to bighead carp is 3:1, that is, 3 silver carp to 1 bighead carp, 75% and 25% respectively. Bighead carp can grow normally under this stocking mode, but with the improvement of people's living standards, the price of silver carp is getting lower and lower, while the price of bighead carp is constantly increasing. The economic benefits of this stocking mode dominated by silver carp are also getting lower and lower. Therefore, how to increase the stocking ratio and yield of bighead carp has become a technical problem that needs to be solved urgently in aquaculture production. With the application of biological organic fertilizers in aquaculture, the algae in the water body have undergone fundamental changes. The species that bighead carp can eat are large, nutritious and easy to digest, such as straight-chain dust-branch diatoms, dinoflagellates, and cryptoalgae, which have become dominant species. The biomass of zooplankton is also high, providing a food basis for bighead carp to become the main fish. According to many years of production practice, in the stocking structure of silver carp and bighead carp, the proportion of bighead carp is less than 20% or greater than 80%, and the growth rate of bighead carp is faster. When the stocking ratio of silver carp is between 20% and 80%, the growth rate of bighead carp will be inhibited. Therefore, when bighead carp is used as the main fish, brothers can only add a small amount of silver carp or not stock it.

3. Fish size. In the past, the stocking size of bighead carp in lakes and reservoirs was generally large-sized fish of about 13.2M, which were raised for 2 years before being put on the market. The breeding cycle was long and the market size was small. Under modern technology, large-sized fish of 150-500g/tail are required. After one year of breeding, the tail weight reaches the market size of more than 2000g.

4. Stocking model problem. Although traditional large water bodies such as lakes and reservoirs also use fertilization technology to raise fish, the output rarely exceeds 100 kg/mu, and the economic benefits are not high. There are three main reasons: First, the size of the fish is small. Using large-sized fish of 20 per kilogram, the recapture rate is low, and the size of adult fish is small, generally 1-1.5 kg/tail; second, the stocking is done once and the catch is done once, so the existing amount of fish in the water is small in the first half of the year, resulting in a waste of water resources. In the second half of the year, the fish density is too high, the natural bait supply is insufficient, and the growth rate slows down; third, the stocking model of silver carp and bighead carp with a ratio of 3:1 is unreasonable. In view of the shortcomings of traditional aquaculture, modern large water bodies adopt high-yield aquaculture: first, use jinliang fish species (0.15-1 kg/tail); second, fish are caught and marketed all year round, that is, some fish that grow to more than 1.5 kg are caught and marketed from June to July, and the remaining fish are caught and marketed in winter, and the sizes of adult fish are 1.5-2 kg/tail and 2.5-4 kg/tail; third, the ratio of silver carp to bighead carp is 1:4, or even all bighead carp is raised, which has high prices and good benefits. There are four types of bighead carp aquaculture: reservoir fertilization pure bighead carp aquaculture; lake fertilization mainly bighead carp aquaculture; small intensive aquaculture water body feeding fertilization mainly bighead carp aquaculture; Tongmin small intensive aquaculture water body fertilization and bighead carp aquaculture. According to different aquaculture models, the stocking model is also different. At the end of June this year, the author used full-price expanded feed as the main feed for yellow catfish. He added 2 cm bighead carp fry of the year to the pond. They grew to 200 grams in more than 40 days. In mid-August, he added 3-4 cm bighead carp fry. By November, they basically grew to 500-700 grams. It was observed at the pond that bighead carp with a tail weight of 100-200 grams can effectively eat small-particle expanded feed, which effectively promoted the rapid growth of bighead carp.

2. How many fish should be put in one acre of fish pond?

It's just bullshit. . . . . The combination of these fish is still the same, with a priority: 1. Grass carp, dace, and carp eat feed, but the protein requirements are definitely different. If you feed grass carp with carp feed, it will be uncomfortable for the money and the fish. If you feed carp with grass carp feed, you will feel uncomfortable. So you still need to determine which one is more and which one is less. 2. Bighead carp (bighead carp) and silver carp (silver carp) should be these two types. They are both food-conscious, so Senyuanshen, you have pig manure flowing in, which is a good thing, but if it can be fermented, it is best to put it in after fermentation. If you don't have that time, haha, preparing more money can also solve the problem. (I'm not asking you to throw money in, but asking you to buy bacteria to adjust the water and prepare to treat the fish. Of course, you may be lucky enough to have nothing happen for a few years. I have seen this a lot. But the density is not high.) Dace can also be food-conscious. It can also benefit from it. 3. The stocking quantity depends on the temperature and the size of the fish. There is definitely a difference between the number of inch-sized fish and the number of 1-liang and 2-liang fish. Generally, for silver carp and bighead carp, it is enough to stock dozens of each. Stock both large and small fish. More silver carp and less bighead carp. Otherwise, bighead carp will also steal the feed. 4. As for the dace you want to stock, I think you should be from Guangdong and Guangxi, or in the south, so you can stock as many fish as you want. Haha. It is most cost-effective to raise fish there.

Nowadays, many piggeries have fish ponds, and almost all of them raise carp. However, oxygenators are placed in the center of the fish ponds to prevent lack of oxygen on rainy days. As for how many fish to put in one acre of fish pond, I really don't know, but I have seen fish die of lack of oxygen during the rainy summer. So my advice is: put an oxygenator in the center of the fish pond, and the cost is not high!

You can't let pig manure flow in like this. You must let the leak ferment. If it doesn't ferment, it will flow in and affect the water quality. I hope you can buy a book and read it. You can ask my teacher, Baidu "Biyin Jianglong Aquatic Products", Professor Wu

3. How to stock fish fry in six mu of fish at an average depth of five meters

If the main farming model is to raise crucian carp, the size of the crucian carp fry is about 50 grams per mu, and the number of fry is 1,500 to 2,000, with 200 silver carp fry and 50 bighead carp fry. The crucian carp can grow to about 200 grams in the same year, and the output can reach about 1,000 catties. 20 to 30 ferocious carnivorous fish, such as catfish fry, sea bass fry and mandarin fish fry, can also be raised per mu to control the reproduction of a small number of sexually mature crucian carp fry.

If the breeding model is mainly based on grass carp, 600 one-year-old grass carp fry weighing 80 grams each can be released per acre, and 250 chain carp fry and bighead carp fry can be added. When the average weight of each fry grows to more than 1,000 grams in the same year, 1,200 kilograms of fish can be produced per acre of water surface.