CATDOLL : CATDOLL: How to cultivate water in reservoirs to raise bighead carp?

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.

Which fish has the highest economic benefits and which aquatic products have the most economic value?

When it comes to which fish to farm, everyone knows that some people ask what aquatic products have the most economic value. In addition, some people want to ask what fish are suitable for large-scale farming? What are the benefits? Do you know what is going on? In fact, which freshwater fish have the best economic benefits? Let's take a look at what aquatic products have the most economic value. I hope it can help everyone!

What kind of fish is the most economically profitable to breed? 1. What kind of fish is the most economically profitable to breed: What kind of aquatic products are the most economically valuable? The following are very good. What kind of fish is suitable for breeding in the south to make money.

1. Paddlefish

The spoonbill is a famous and large freshwater economic fish produced in North America (the United States). Its feeding habits are similar to those of my country's bighead carp. It feeds on zooplankton and is a filter-feeding fish, but it can also eat water earthworms and artificial compound feed. The spoonbill is one of the fastest growing freshwater fish. The fry can reach more than 0.5 kg per year. It is an excellent species for ponds, especially reservoirs and lakes. The spoonbill has extremely high economic value. The meat of adult fish is more boneless and contains 18.1% protein. The meat is delicious and can be directly processed into dishes or sashimi; it can also be made into smoked fish or canned food. Its price is 70-80 US dollars per kilogram, and it is in short supply in the market. The adult female fish eggs contain up to 20.6% protein. It is a precious tonic and can be made into caviar. It is popular in the market and in short supply. The price is D US dollars per kilogram and is known as the "black gold nugget". The swim bladder and chord can be made into fish glue, and the fish skin can be processed into high-end leather products. In addition, the notochord contains the anti-cancer factor KH2, which is 4 to 5 times that of sharks, so it is very promising.

2. Hilsa

In fish taxonomy, shad belongs to the order Herpetiformes, family Clupeidae, genus Hilsa. It was once known as a "famous fish" in Chinese history along with the Yellow River carp, Taihu whitebait, and Songjiang perch, and has been famous for thousands of years.

3. American Golden Grouper

American tiger fish, also known as American yellow croaker, is distributed in major lakes in the eastern United States. The fish is golden yellow with dark green stripes along the sides. It has an elegant and beautiful shape, elastic and sweet meat, no fishy or peculiar smell, and no intramuscular spines. It is a carnivorous fish with a growth temperature of 20℃-28℃, which is very suitable for high-density breeding. It has a wide range of salt adaptation, likes to gather in groups, is easy to domesticate, grows fast, has strong disease resistance, is relatively resistant to high temperatures, has strong adaptability to the environment, is resistant to low oxygen, and is very easy to move. It is very popular among consumers in the United States, has high economic value and promotion value, and has a very broad breeding prospect.

4. What kind of fish does it cost to raise Australian silver perch?

The origin of the Australian silver perch is the Morry-Darling River system in Queensland, Australia. It is a well-known freshwater fish in Australia and is considered to be a good fishing and edible fish. The silver perch is mild in nature, does not cannibalize each other, has a high growth rate, a high feed-to-meat coefficient, and grows quickly. The fish has strong adaptability to the environment, a wide range of temperatures and salts, and is easy to domesticate. The silver perch can be factory-farmed or cultured in reservoir cages. It is also suitable for culture in freshwater ponds and reservoirs in various places, and can be cultured in brackish and freshwater seashores. In some aspects, it is very similar to the cage culture of tilapia. As a newly introduced edible fish, the silver perch has excellent traits, such as beautiful appearance, meat quality, few intramuscular spines, fish meat coverage of more than 52%, protein content of more than 18.9%, more than 8 kinds of amino acids that are beneficial to the human body, and amino acid content of 61.56%. At the same time, the silver perch has an oil mass with a high oil yield. It is rich in highly unsaturated fatty acids, especially DHA, which is known as brain gold, and EPA, which prevents arteriosclerosis. The content is much higher than that of precious fish such as red sea bream, black sea bream, and yellow croaker. Fish with a short breeding cycle.

5. Silver Shield Fish

Silver shield fish is a kind of freshwater economic fish in the United States. Its biological characteristics, breeding methods and requirements are basically similar to those of Chinese mandarin fish. In addition, it has low requirements for water environment, wider diet and stronger disease resistance. What kind of fish can be farmed to make a profit in three months?

6. Australian Jewel Bass

Which freshwater fish have good economic benefits? The Australian jewel perch belongs to the order Perciformes and is a long-standing freshwater fish in Australia. It is considered to be a good fishing and edible fish. The jewel perch grows fast. Under suitable water temperature conditions, its growth rate can reach grams/12 months. It has strong environmental adaptability and can survive in water temperatures ranging from 10-38°C. It is fed with hard pellets and is easy to solve. The jewel perch can be factory-farmed or cage-farmed in reservoirs, and is also suitable for pond farming. The basis is that the jewel perch has excellent traits such as clustering for food, rapid growth, and strong disease resistance during breeding. In some aspects, it is very similar to the cage farming of tilapia and carp. What kind of fish is profitable and easy to manage?

7. Desert flounder

The desert flounder belongs to the order Pleuronectiformes, family Pleuronecti, genus Pleuronecti. This fish is native to the United States and is distributed along the Atlantic coast of northern Florida and the Gulf of Mexico. Its meat is delicious, more delicate and elastic than that of the Japanese flounder. It is omnivorous and has a wide range of salt adaptability. The young fish can be directly cultured in fresh water, like to gather in groups, grow fast, and can reach 1 jin per year under suitable conditions. It has strong disease resistance, is relatively resistant to high temperatures, has strong adaptability to the environment, is resistant to low oxygen, and is easy to transport. It is very popular among consumers in the United States, Japan, and other countries. It has high economic value and promotion value, and its breeding prospects are very broad.

The above is the content related to what kind of aquatic products are most economically valuable. After reading which kind of fish farming has high economic benefits, I hope this will be helpful to everyone!