CATDOLL : CATDOLL: How many fish can be raised in a 5-mu fish pond? What kind of fish can be raised in a fish pond?

1. How many fish can be raised in a 5-mu fish pond? What kind of fish can be raised in the fish pond?

A 5-acre fish pond can raise about 5,000 fish. Fish ponds usually adopt the method of intercropping. The so-called intercropping is to mix multiple fish together. There is no need to worry about the fish fighting, because different types of fish live in different water layers. As long as they are separated, the fish pond can be maximized, thereby increasing economic benefits. The fish raised in intercropping are generally common fish such as silver carp, bighead carp, grass carp, carp, and crucian carp. 1. How many fish can be raised in a 5-acre fish pond? A 5-acre fish pond can raise about 5,000 fish. Fish ponds usually adopt the method of intercropping. The so-called intercropping is to mix multiple fish together. There is no need to worry about the fish fighting, because different types of fish live in different water layers. As long as they are separated, the fish pond can be maximized, thereby increasing economic benefits. The fish raised in intercropping are generally common fish such as silver carp, bighead carp, grass carp, carp, and crucian carp.

2. What fish to raise in fish ponds 1. Silver carp: Silver carp is one of the four major carps. Like bighead carp, it is a filter-feeding fish and lives in the upper layer of the water. This type of fish is particularly easy to raise and will eat plankton in the water, thereby controlling the reproduction of algae and having a certain purifying effect on water quality, but usually do not raise too many.

2. Grass carp: Like silver carp, grass carp is also one of the four major carps, but it is more common and more popular than silver carp. It is a herbivorous fish that lives in the middle and lower layers of the water body. Due to its special feeding habits, it is unlikely to compete with other fish for food, so it is also very good for arranging.

3. Carp: Carp is a common economic fish in my country. It usually lives at the bottom of the water. It is easy to raise and has a variety of diets, so it can also be raised in a set. Because it lives at the bottom of the water, it does not conflict with other fish and it eats everything, so it is relatively convenient to raise.

2. What kind of feed can make bighead carp grow faster?

Bighead carp is one of the four major carps. As bighead carp has a weak ability to compete for food, try not to raise it in a cage, which will reduce its prey intake and lead to slow growth. It is recommended to use the 8% bighead carp premix produced by Liyang Zhengchang Feed Technology Co., Ltd., which is suitable for farmers to feed by themselves. Farmers use the formula they provide, which not only ensures that the quality of the feed made can be controlled by themselves, but also makes them feel at ease. You can give it a try! Baidu has a lot of information on this.

3. When white shrimps are used to raise bighead carp fry, will the bighead carp compete with the shrimps for shrimp feed in the later stage?

Based on the situation you described, the answer is as follows, I hope it can help you!

What you are talking about is the mixed culture model of fish and shrimp. Based on my experience in promoting the freshwater culture technology of white shrimp in Jiahua Aquatic Products for 6 years, your current situation is very unreasonable from the perspective of shrimp. The reasons are as follows:

1. Bighead carp will compete with shrimp for food: Bighead carp is a filter-feeding fish. From the fry to the adult stage, it mainly filters rotifers and cladoceran zooplankton. It also eats phytoplankton, such as diatoms and cyanobacteria, so it is known as the "water scavenger". In addition, bighead carp also eats artificial feed (expanded feed). In general, bighead carp mainly feeds on zooplankton and also eats phytoplankton. As for shrimp, within 20 days after the shrimp fry enters the pond, they generally eat rotifers and other cultivated biological baits in the water, and also eat artificial "0" shrimp special feed (powder). From the above information, we can see that: first, bighead carp and prawns compete for rotifers; second, because bighead carp is a filter-feeding fish, prawns "0" feed will not sink to the bottom of the pond immediately after being put into the pond, so bighead carp and prawns compete for shrimp feed; (Additional supplement: In 2014, because our company did not have a prawn feed machine, our company made prawn puffed feed to feed the shrimps, and it was found that about 30% of the adult shrimps would also float to the surface to eat. I dare to conclude that after you put in the bighead carp feed, the prawns will also eat it, but the nutrition of the bighead carp feed cannot keep up, which will affect the growth of the prawns, such as difficulty in molting, after all, the nutrition is not enough.)

2. The order of putting bighead carp and prawns into the pond is reversed: Generally, when putting bighead carp into a shrimp pond, the prawns should be put into the pond first after the water is well cultivated (with sufficient zooplankton and plants). After all, biological bait is more nutritious and cheaper than artificial feed (No. 0 prawn feed is generally 10,000 yuan/ton, and biological bait is just for cultivating water. Putting bighead carp into the pond first is a waste of cost!). Bighead carp should be put into the pond one month after the shrimp fry are put into the pond. This can play a role in regulating water and is conducive to the growth of prawns;

3. Putting too many bighead carps will affect the growth of shrimps. Prawns are animals that stay at the bottom of the pond during the day and move around and forage at night. Too many bighead carps will disturb the rest of the shrimps and affect their molting (shrimps usually molt five days before and after the first and fifteenth day of the lunar calendar, and they molt every 30 to 40 hours in the juvenile stage), such as difficulty in molting and death. Under normal circumstances: if the pond is mainly shrimp, a maximum of 20 bighead carps per mu is enough, but you put 250 per mu. If the pond is mainly bighead carps, shrimps are generally just for show, and 5,000 per mu is enough.

4. Difficulty in water improvement: Too many bighead carps will cause water pollution and a decrease in dissolved oxygen. Shrimp are high oxygen-consuming animals. The oxygen consumption of a bighead carp weighing about 1 jin is 200 times that of an adult shrimp. Too many bighead carps will cause shrimp to be short of oxygen. In addition, too much feces produced by bighead carps every day will affect the water body and make shrimps more susceptible to illness.

5. Fishing difficulties: During the shrimp season, shrimps are usually caught with ground traps. If you put too many bighead carps, one or several bighead carps will be taken out every time the shrimps are taken out of the water, making it difficult to sort them. At the same time, bighead carps are very active after entering the ground traps, and may knock through the mesh, causing the shrimps to escape. These escaped shrimps are likely to be injured by bighead carps, and will slowly die after entering the pond, causing other shrimps to be infected.

4. How to cultivate water in reservoirs to raise bighead carp?

Bighead carp (silver carp, bighead carp), because of its delicious head and rich nutrition, has become a popular and affordable edible fish. The market price has been relatively strong in recent years. Bighead carp grows fast, has few diseases, and is easy to catch. Under certain conditions, the seedlings can grow to 500-1000 grams in the same year, and can grow to more than 2500 grams after two winters.

How to raise bighead carp well, you need to pay attention to the following points:

1. The eating habits of bighead carp.

In previous data, the diet of bighead carp was defined as a mild filter-feeding fish that mainly feeds on zooplankton. It is 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 its gill rakers. As long as the plankton is larger than the distance between its gill rakers, it can filter it. The food of silver carp is mainly plankton that is smaller than 50 microns, and the food of bighead carp is mainly plankton that is larger than 50 microns. Under fertile water conditions, plankton is mainly straight-chain diatoms, dinoflagellates, euglena, filamentous cyanobacteria, large rotifers, cladocerans, copepods and other species that are larger than 50 microns, which are exactly the filter-feeding objects of bighead carp.

2. The ratio of silver carp and bighead carp.

The traditional ratio of silver carp and bighead carp is 3:1, that is, 3 silver carp and 1 bighead carp, which are 75% and 25% respectively. Under this stocking model, bighead carp can grow normally, 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 rising. The economic benefits of this stocking model with silver carp as the main focus 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 phase of the water body has undergone fundamental changes. The species that bighead carp can eat, such as straight chain diatoms, dinoflagellates, and cryptophytes, 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, silver carp can only be stocked in small quantities or not at all.

3. Fish species specifications.

In the past, the stocking specifications of bighead carp in lakes and reservoirs were generally large-sized fish of about 13.2 cm, which were raised for two years before being put on the market. The breeding cycle was long and the market size was small. Under modern technology conditions, large-sized fish of 150 to 500 grams are required. After one year of breeding, the tail weight reaches more than 2,000 grams for market.

4. Problems with the free-range model.

Although traditional large water bodies such as lakes and reservoirs also use fertilization technology to raise fish, the output rarely exceeds 100 kilograms per 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 at 20 per kilogram has a low catch rate and small adult fish size, generally 1 to 1.5 kilograms per fish.

Second, the fish are released once and caught once. In the first half of the year, the existing fish population in the water is small, 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 pattern of silver carp to bighead carp in a ratio of 3:1 is unreasonable.

In view of the shortcomings of traditional aquaculture, modern large-water high-yield aquaculture:

One is to use jinliang fish species (0.15-1 kg per fish);

Second, they are fished and marketed all year round, that is, from June to July, some fish that grow to more than 1.5 kg are caught and marketed, and the remaining fish are caught and marketed in winter. The sizes of adult fish are 1.5-2 kg and 2.5-4 kg each.

Third, the ratio of silver carp to bighead carp is 1:4, or even all bighead carp can be raised, which has high price and good benefits.

There are four types of bighead carp farming models: pure bighead carp farming with fertilization in reservoirs; main bighead carp farming with fertilization in lakes; main bighead carp farming with fertilization by feeding in small intensive aquaculture waters; and main bighead carp farming with fertilization in small intensive aquaculture waters.

The stocking mode is different according to different breeding modes. At the end of June, the author used full-price expanded feed to raise yellow catfish in the pond and added 2 cm bighead carp fry of the year. They grew to 200 grams in more than 40 days. In mid-August, 3-4 cm bighead carp fry were added again. 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.