CATDOLL : CATDOLL: How many crucian carp, silver carp, bighead carp and carp fry should be scattered per acre of water? How much does the fry cost? How many kilograms of adult fish can be produced? How much can it be sold for?

How many crucian carp, silver carp, bighead carp and carp fry should be scattered per acre of water? How much does the fry cost? How many kilograms of adult fish can be produced? How much can it be sold for?

Let's put it this way. If you want high-density breeding, the yield per mu is calculated as 2,000-2,400 catties. If you mainly raise crucian carp, there are ten crucian carp per catty, and the price is about 5 yuan per catty. You can put about 300 catties per mu. You can put about 100 silver carp and bighead carp each. The price varies in each place.

1000 crucian carps, 50 silver carps, 30 bighead carps, 200 carps, mixed three-dimensional breeding

Tips for fish farming

Fish is one of the most familiar animals in nature, so how should fish be farmed? Let's take a look at the fish farming techniques I carefully recommend to you, I hope it will be helpful to you.

Fish farming technology

1. Maintain a certain water level

The main benefits of maintaining a certain water level are: first, to keep the water temperature and water quality relatively stable. The deeper the pool water, the less likely it is that the heat energy stored in the water will be lost, causing the water temperature to rise, and the temperature will be relatively stable, which is beneficial to the growth of fish; if the pool water is too shallow, the heat energy will be lost quickly, not only will the water temperature be difficult to increase, but it will also change frequently, which will have an adverse effect on the fish; second, it can reduce the harm of harmful organisms entering the pool with water. In production, it often happens that during the process of adding water to the fish pond, pathogenic microorganisms, parasites, and wild fish are inevitably brought in with the water. When the number is too large, it will cause diseases, and compete with farmed fish for food and oxygen, which will have an adverse effect on farmed fish. In April, because the water temperature is still relatively low, they have not yet reproduced, and there are basically no eggs and larvae in the water. Seizing this favorable opportunity to add more water is an effective measure to reduce the harm caused by excessive harmful organisms in the future.

2. Adjust water quality early and create a suitable environment

As the water temperature is still low, the photosynthesis of phytoplankton is not strong, and carbon dioxide cannot be fully absorbed and utilized by phytoplankton. In addition, the oxidation and decomposition of organic matter and the respiration of fish and other organisms release a large amount of carbon dioxide, which makes the concentration of carbon dioxide in the water continue to rise, directly irritating and paralyzing the fish. At the same time, the organic acids in the water work together to reduce the pH value of the pond water to acidic, which is very harmful to the fish. Therefore, it is necessary to adjust the water quality in advance to create a suitable environment for fish. Methods for adjusting water quality: Apply lime and phosphate fertilizer to increase the calcium and phosphorus content of the water body, improve water quality conditions and the physiological metabolism of fish, which can effectively prevent fish diseases and fish deaths caused by water quality deterioration.

3. Prevent and control fish diseases early to reduce losses caused by diseases

After a winter, most of the fish in the pond have been caught and transported into the fish pond. The fish have poor resistance and are very susceptible to diseases. Production practice has proved that drug prevention and control in early April can kill a large number of mothers and larvae of pathogenic microorganisms and control the spread of the disease. The loss is much smaller than the high-dose drug treatment during the peak period of the disease, and the disease prevention effect can be achieved with half the effort.

4. Pay attention to early feeding and fertilization

Fish species management technology

1. Transfer ponds and clean ponds to optimize the environment. After the high temperature breeding period in summer and autumn, a large amount of harmful substances will be deposited in the bottom of the pond, and the acidity in the pond will be high. In late autumn, the fish should be transferred to ponds that have been cleaned and disinfected for breeding so that the fish can safely overwinter. Disinfect the original pond with 75-100 kg of quicklime per mu. After the drug properties disappear, fertilize the water quality according to the conventional method, and transfer the fish back to the original pond after 5-7 days.

2. Carefully screen and classify the fish by size. Combined with the transfer of fish species, the fish species should be sorted by size, and the size of the fish species of the same species in the same pond should be consistent as much as possible. Large-sized fish species have a large appetite and strong ability to grab food. If small-sized fish species are placed at the same time, the small-sized fish species will not get enough feed, eat unevenly, and their physical fitness will decline. Fish species that are more than one or two catties can be put into adult fish ponds for breeding. Fish species that are particularly small in size should be cultivated in special ponds, and feeding should be strengthened to quickly rejuvenate.

3. Reasonable stocking density. In order to improve the survival rate of fish species during winter, the stocking density should be reasonable according to the size of the water surface, the depth of the water body and other conditions. For a pond with a water depth of 1.5 meters, 4,500 to 6,000 fish species with a length of 7 to 8 centimeters should be stocked per mu. For a pond with a water depth of 1.5 to 2.5 meters and a wide water surface, 6,000 to 10,000 fish species should be stocked per mu.

4. Strengthen management and scientific feeding. For fish ponds that mainly raise grass carp, silver carp and bighead carp, green feed should be used as the main feed, and concentrated feed should be used appropriately. Every day, 70-90 kg of duckweed or water grass and 1.5-2.5 kg of concentrated feed should be put in for every 10,000 grass carp. Green feed should be put in first, and then concentrated feed to prevent grass carp from competing for food with other fish. Ponds that raise silver carp and bighead carp should also be fertilized regularly, once every 10-15 days, and 100-150 kg of fermented human and animal manure should be applied per mu. The transparency of the pond water should be maintained at 30-35 cm.

For fish ponds with silver carp and bighead carp as the main species and grass carp as the auxiliary species, fertilization should be the main method, supplemented by feeding. In addition to basal fertilizer, topdressing should be applied once every 10 days or so, with 80-100 kg of decomposed human and animal manure per mu, and 2-4 kg of concentrated feed per 10,000 fish per day. For grass carp, it is advisable to feed 60-90 kg of green feed per 10,000 grass carp before feeding concentrated feed. At the same time, we must insist on patrolling the pond in the morning, noon and evening, and solve the problems in time when they are found. The feeding area should be cleaned and disinfected frequently, and the residues and leftover baits should be removed in time. Every half month, 0.5-1 kg of bleaching powder dissolved in water should be sprinkled or hung in baskets around the feeding area, and bait and medicine should be fed regularly, preferably twice a month, and each time for 3 consecutive days to ensure the health of the fish.

Fish farming management measures

The temperature will gradually rise. When the water temperature reaches above 10℃, pay attention to observe the activity and eating habits of fish. For ponds mainly breeding fat fish, organic fertilizer should be applied according to the water quality and water transparency to cultivate natural bait in the water. Generally, about 100 kg of fermented organic fertilizer is applied per mu. For ponds mainly breeding omnivorous or grazing fish, some commercial feed should be fed at fixed time as early as possible. The feeding method is to feed once every other day in sunny weather. The feeding amount is about 0.5% of the body weight of the grazing fish in the pond. Later, the feeding amount and frequency should be gradually increased as the water temperature rises.

1. Improve the living environment of fish ponds

Remove excess silt and use quicklime or bleaching powder for pond cleaning. When using quicklime for pond cleaning, only 5-10 cm of water is left in the pond, and 60-70 kg of quicklime is used per mu; when using water, 100-200 kg per mu for a 1-meter deep pond. When using bleaching powder, calculate according to the volume of water in the fish pond, that is, 20-33 kg per mu for a 1-meter water depth.

2. Do a good job in stocking fish

1. Stocking time selection: Fish should be released on sunny days with not too low temperature. Generally, the temperature should be between 2℃ and 5℃. At this stage, the scales of fish are tight and the activity is small. It is not easy to injure the fish during fishing, transportation and stocking operations, which can reduce the morbidity and mortality of fish. It is easy to frostbite the fish on rainy days with low temperature or snowy, frozen and windy weather; when the temperature is too high, the scales of fish are loose and the activity is large, which is easy to injure the fish during operation.

2. Stocking of fish: Before stocking the fry, check whether the medicine has lost its effect after cleaning the pond. In early spring, the water temperature is low and the toxicity disappears slowly. Water should be taken in advance and test fish should be released. According to the stocking plan, individual size, density, and matching species and specifications, the fish that can be released at one time should not be released in batches, so that the fish can adapt to the environment, start eating early, and promote growth. At the same time, [Gold Iodine] should be used for drug disinfection when stocking the fry.

3. Feeding bait at the right time

When the water temperature rises to 8-10℃, fish begin to eat, and the amount of food intake gradually increases with the increase of water temperature, so they should be fed in time. Feed once a day or every other day, and choose to feed at noon on a sunny day; as the water temperature continues to rise, the number of feedings can be increased to twice, that is, feeding once in the morning and once in the afternoon. Feeding should adhere to the principle of "four determinations" (timing, quality, positioning, and quantity), and the specific daily feeding amount should be flexibly controlled according to the weather, water temperature, and the feeding situation of fish. For grass carp weighing more than 1 jin, it is recommended to feed Da Beinong high-grade puffed feed 8103 in the early stage of feeding; for small grass carp mode, it is recommended to feed Da Beinong microecological juvenile fish special feed [Intestinal Liver Health], and the feeding rate is controlled at about 0.5%-1%. This product is rich in nutrients and probiotics, which can quickly repair the fish intestines, restore physique, and improve immunity.

4. Add organic fertilizer to improve water fertility

Triple-effect organic biofertilizer, long-lasting fertilizer effect

Yizaoyuan promotes algae growth and quickly enriches the water

After the fish pond has been cleaned, dried, and disinfected in winter, the water fertility is low. As the saying goes, "raise the water first to raise fish", it is particularly important to fertilize the pond water. In spring, it is best to apply organic fertilizer. It is recommended to use biological fertilizers rich in various trace elements [Three-effect Fertilizer Water King] or Fertilizer Water Pioneer [Yi Zaoyuan]. The specific amount and frequency of fertilization should be determined according to the quality of pond water and fertilizer. The general principle is: large amount and small frequency in early spring, small amount and large frequency in late spring. Make the pond water green (including blue-green, yellow-green and bean green) or brown (including yellow-brown, reddish brown and tea-brown), the water transparency is moderate, and it should be maintained at about 30 cm. The water temperature is low in early spring and should be controlled at 20-30 cm. The temperature is high in late spring and should be controlled at 25-35 cm. The water quality should be "fertile, active, tender and refreshing".

5. Fish disease prevention

The most common fish diseases in spring are: Saprolegniasis, vertical scale disease, white cloud disease, uterine nematode disease, carp pox disease, etc. Due to excessive breeding density and improper management, the water quality deteriorates, the fish are injured, and the immunity decreases. At this time, pathogenic bacteria multiply and invade the fish, thus causing the disease. Therefore, we should do the following:

1. Stock healthy seedlings. When stocking, be sure to check whether the seedlings are sick or have diseases. Once found, immediately use drugs to treat or stop stocking to reduce the occurrence of diseases.

2. During the process of catching, counting, transporting and stocking, be as careful as possible to avoid injuring the fish. Before stocking, you can use 2%-3% salt water solution to bathe the fish for 4-10 minutes.

3. Disinfection of bait. Animal baits such as snails must be fresh and washed with clean water before feeding; plant baits such as duckweed and other water plants must be soaked in 20 mg/L bleaching powder solution for 20 minutes before feeding; organic manure must be fermented and then mixed with 120 g bleaching powder at 50 kg before feeding.