CATDOLL : CATDOLL: If you want to make more money from fish farming, what are the technologies to increase the production and efficiency of silver carp?

If you want to make more money from fish farming, what are the technologies to increase the production and efficiency of silver carp?

1. Food Supply

Both silver carp and bighead carp are filter-feeding fish that mainly feed on plankton, organic debris and bioflocs. They can also be fed artificial feeds. The difference is that silver carp mainly feeds on zooplankton, while bighead carp mainly feeds on phytoplankton.

We can improve the food supply of silver carp from the following four aspects.

1. Directly supplement food: feeding feed, such as using fermented feed and silver carp special feed to directly increase food supply.

2. Fertilize water: Add organic fertilizer, inorganic fertilizer, biological fertilizer, etc. to promote the growth of plankton. You can use Hechenhua silver carp special biological fertilizer: water nanny + silicon calcium quick supplement to promote the growth of biological bait and balance the algae phase.

3. Supplement beneficial bacteria: Use beneficial bacteria to decompose organic matter in the pond and form bioflocs. You can use Hechen Water Enzyme, concentrated photosynthetic element, and biological water purifier.

4. Bottom improvement: Oxidize and decompose the pond bottom and reuse the nutrients on the bottom of the pond, such as using quicklime, potassium persulfate, etc. to oxidize the bottom. You can also use Hechen Biological Bottom Cleaner for biological bottom improvement.

When stocking the fish, it is also necessary to consider the food competition between silver carp and other organisms in the pond: for example, crucian carp also mainly feed on zooplankton, algae, organic debris, etc. If there are too many crucian carp, the amount of silver carp stocked can be appropriately reduced; snails will also compete with silver carp for food, so if there are too many snails, a small amount of black carp can be added to inhibit the growth of snails.

2. Grading feeding

Graded breeding can rationally utilize the pond's breeding space and food, so it is recommended to match fish species of different sizes: mainly silver carp, which can be raised in three sizes of 0.2 to 0.3 jin, 0.5 to 0.8 jin, and 1 to 1.5 jin; the size of bighead carp is 0.2 to 0.5 jin.

The advantages of this method are: ① It reduces the competition for food between big silver carp and bighead carp; ② After the big silver carp are released, only small-sized silver carp need to be supplemented, which is conducive to rotation of catch and release and reduces the cost of stocking.

3. Reasonable close breeding

Reasonable density breeding takes into account the limited carrying capacity of the pond. Too high density may lead to slow growth of fish, more diseases, and failure to reach the market specifications as scheduled; too low density will increase the cost of fish per kilogram and reduce the breeding efficiency.

Since the economic value of silver carp is much higher than that of bighead carp, in the efficient breeding model of silver carp, the main goal should be to increase the output of silver carp, so it is recommended to increase the proportion of silver carp. As shown in Figure 3, for the same 200 silver carp, the higher the proportion of silver carp, the higher the benefit per mu.

It is best to choose free-range breeding, control the water quality, and catch the fish in time, and try not to release too many.

You must clean the fish pond regularly, and you also need to know how to use high-quality fertilizers to avoid disease.

I personally think that we can think systematically from the following five aspects: ① Food supply; ② Grading and breeding; ③ Reasonable intensive breeding; ④ Rotational catching and releasing; ⑤ Breeding management. Add organic fertilizer, inorganic fertilizer, biological fertilizer, etc. to promote the growth of plankton. You can use the special biological fertilizer for silver carp: water nanny + silicon calcium fast supplement, promote the growth of biological bait, and balance the algae phase. Grading and breeding can make reasonable use of the breeding space and food in the pond, so it is recommended to match fish of different sizes.

What kind of bait does fathead fish eat

There are two kinds of baits for fishing bighead carp: sour-flavored bait is specifically for fishing silver carp, and sour-flavored MSG bait is specifically for fishing bighead carp.

Bighead carp, also known as bighead carp (hereinafter referred to as bighead carp), silver carp, yellow carp, black carp, bighead carp, fathead carp, silver carp, which is also known as silver carp, bighead carp, jumping silver carp, etc., is one of the main freshwater farmed fish in my country. Except for Heilongjiang, it is naturally distributed throughout the country. It is also a farmed fish species with certain economy in the Pearl River Delta.

The body shape of bighead carp is similar to that of silver carp, but the difference is that the head is particularly large, almost accounting for one-third of the length of the whole fish, so it is also called bighead fish or fathead fish. Silver carp is different, with a small head and a flat and long body. Bighead carp and silver carp are both warm-water fish, often living in the middle and upper layers of water bodies. Silver carp is closer to the water surface. Bighead carp is docile by nature and moves gently, unlike silver carp, which will jump around when frightened.

Bighead carp and silver carp are the same in that they have few diseases, are highly resistant to disease, are easy to raise, are more resistant to low oxygen than other hornfish, can live in fertile waters, and feed mainly on plankton throughout their lives.

Hot water is more active

Bighead carp and silver carp usually grow faster. When the water temperature is appropriate, their growth rate is faster than grass carp. During the growing season, they are mostly fattened in lakes, ponds and reservoirs in rivers and tributaries. When the temperature drops, their appetite decreases, but they still eat, but they move to the depths of riverbeds and lakes and reservoirs to hibernate.

It is best to use a sea fishing rod to fish for bighead carp and silver carp. This is a unique fishing method for bighead carp and silver carp. Because bighead carp and silver carp are large, the small ones are two or three pounds, and the large ones are more than ten or twenty pounds. Therefore, when choosing a sea fishing rod, you must pay attention to choosing a casting rod with a thicker rod tail (about 8#) of 24 meters to 27 meters. It is convenient to reel in and release the line with a sea fishing rod. The best fishing line is 4# to 5# sea fishing line, and the troll is generally a 50g through-core live troll. The method of baiting bighead carp and silver carp is quite special, so it is best to use 10# to 12# explosive hooks. The preparation and matching of bait for bighead carp and silver carp.

Production of sour and smelly food: 80% corn flour and 2% white flour, mix them together, wash with boiling water, steam them, crush them while hot, add fish yeast dissolved in water (dry yeast tablets are also OK), put them in a plastic airtight bag, seal them and ferment them, it should be airtight, and expose them to the sun for about two to three days. Take as much as you need when you use it, and the rest can be sealed for later use. Put them in a clean airtight bag, expel the air and seal them to isolate them from the air, then expose them to the sun for two to three days to make sour bait.

It is a filter feeder, mainly eating zooplankton such as rotifers, cladocerans, copepods (such as sword water fleas), and some phytoplankton (such as diatoms and cyanobacteria) and artificial feed. From the fry to the adult stage, it mainly feeds on zooplankton and also eats phytoplankton. It is a typical planktonic fish.



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Details



Fathead fish



Science Popularization China

This entry is reviewed by the "Science Popularization China" scientific encyclopedia entry writing and application work project

Contributor Wei Dayong

Details

Bighead carp, also known as bighead carp, is commonly known as bear fish, silver carp, black carp, yellow bream, loose fish, fish, and bighead fish. English name: Bighead, Bighead crap. It is a bighead carp (Aristichthys mobilis) belonging to the Cypriniformes, Cyprinidae, Hypophthalminae, and Bighead genus. It grows rapidly, and a 3-year-old fish can reach 4-5 kg, and the largest individual can reach 40 kg. The natural yield is very high. It has few diseases and is easy to raise. It is one of the "four major carps" in my country's freshwater aquaculture industry and an important economic fish in my country.

Chinese name

Bighead carp

Aliases

Fathead fish, silver carp, bighead fish, black carp, yellow carp

Order

Cypriniformes

division

Cyprinidae

Subfamily

Hypophthalminae

Biological profile

Bighead carp family

: Also known as silver carp, fathead fish, black carp, yellow carp, loose fish, fish, bighead fish, Baijia fish, silver carp, bighead fish, bighead carp, whale. Bighead carp belongs to the Cypriniformes, Cyprinidae, Hypophthalminae, and Bighead genus.



Bighead carp

Distribution of Bighead Carp: Bighead carp is widely distributed in waters, and can be found in almost all freshwater basins in China from the south to the north. Bighead carp is a filter-feeding fish that has a water-cleansing effect. It is usually raised together with other fish in fish ponds and reservoirs, so some people give it the elegant name "water scavenger".

Bighead carp's habits: Bighead carp is docile, doesn't like to jump, and moves slowly. It lives in the middle and upper layers of the water body, has the habit of migrating between rivers and lakes, and usually lives in rivers and lakes with a certain flow rate. It is a filter feeder, mainly eating rotifers, cladocerans, copepods (such as sword water fleas) and other zooplankton and protozoa, and also eats some phytoplankton (such as diatoms and cyanobacteria) and artificial feed. Bighead carp has large gill hairs and mainly feeds on microorganisms in the water, and sometimes swallows fish, insects and shrimps.

Shape of bighead carp: Bighead carp has a flat body and an extremely enlarged head. The mouth is large and terminal, with the lower jaw slightly tilted upward. The gill rakers are fine and leaf-shaped, but not united. There are spiral-shaped supragranial organs in the upper part of the oral cavity, small eyes, low position, no whiskers, and spoon-shaped pharyngeal teeth with smooth tooth surfaces. The scales are small, and only the pelvic fins and even the anus have cortical ventral ridges on the ventral surface. The pectoral fins are long, and the ends are far beyond the base of the pelvic fins. The upper half of the body is gray-black, the abdomen is gray-white, and there are many irregular small spots of light yellow and black on both sides.

Bighead carp grows faster than silver carp. In natural rivers and lakes, individuals weighing more than 10 kg are common, and the largest can reach 50 kg. It is suitable for breeding in fertile ponds. Under sufficient feed conditions, a one-year-old fish can weigh 0.8-1 kg. The age of sexual maturity is the same as or slightly earlier than that of grass carp. In most areas, the weight of newly mature individuals needs to be more than 10 kg, but in Guangdong and Guangxi, broodstock weighing less than 10 kg can also lay eggs. The spawning season is usually from early May to mid-June, and other breeding ecological conditions are roughly the same as those of silver carp. [1]