CATDOLL : CATDOLL: Is it possible to raise black carp in cages and silver carp outside cages?

1. Is it possible to raise black fish in cages and silver carp outside cages?

It is OK to raise black fish in cages and silver carp outside cages. This can save space and improve utilization. In the 1980s, cage aquaculture in lakes in my country gradually developed. By 2004, the area of ​​cage aquaculture in natural inland lakes in my country reached 5,310.2 hectares, and the output reached 592,300 tons. The combination of superior lake fishery environment and high-yield cage aquaculture technology has changed the traditional simple fishing operation mode, produced high-quality aquatic products, formed efficient market competitiveness, and promoted the rapid development of lake cage aquaculture. There are many ways to cage aquaculture. Choosing a floating platform built with buoys and using fishing nets to enclose the bottom of the water to form a natural fishing ground is the choice of many people now.

2. What is the model for raising bighead carp?

Reference table of mixed culture ratios of pond fish Farming methods and pond conditions Ratios of various fish species (%) Main fish cultured in the upper layer Main fish cultured in the bottom layer Mixed fish cultured in the bottom layer Intensive culture pond with feeding and fertilization Silver carp, bighead carp 40 -50 Silver carp, grass carp, carp 30 -40 Bream or bream. dace or silver carp, crucian carp 20 silver carp and bighead carp in ponds with fertilizer but no feeding 75-85 carp, crucian carp, silver carp or dace 10-15 black carp, grass carp, bream or bream 5-10 silver carp and bighead carp in ponds with relatively rich water quality 60-70 carp, crucian carp, silver carp or dace 20-30 black carp, grass carp, bream or bream 5-10 silver carp and bighead carp in ponds with moderately rich water quality 40-50 carp, grass carp, black carp 40-50 bream or silver carp or dace, crucian carp 10 silver carp and bighead carp in ponds with fast water exchange or slight flow and clear water quality 10-15 black carp, grass carp, carp 70-80 Bream or bream, silver carp or dace, crucian carp 10 -15 Thin and clean pond silver carp and bighead carp 5 -10 Grass carp, carp, carp 65 -70 Bream or bream, silver carp or dace, crucian carp 20 -25

3. What should we pay attention to in preventing diseases when farming mandarin fish in cages? Also, when is the best time to sell it?

Mandarin fish, also known as sweet-scented osmanthus fish, is one of the precious freshwater fish species. Cage culture of mandarin fish has the advantages of less water surface occupation, less investment, short breeding cycle, high yield and good benefits. The cage culture technology of mandarin fish is introduced as follows.

Water area selection: The water area for setting up cages requires an open surface, far away from the waterway, stable water level, slow water flow, fresh water quality, no pollution, convenient transportation, abundant natural feed, and no predators.

Cage setting: The cage is generally 5×5×2.5 meters in size, 1.8-2 meters deep in the water, and the bottom of the cage is 20-30 centimeters from the bottom of the water. The four corners of the cage are fixed with 4 bamboos, and the four bottom corners are sunk with stones to prevent them from being washed away by currents, wind and waves.

Stocking of seedlings: Cage culture of mandarin fish, preferably big-eyed mandarin fish or upturned mandarin fish. Before stocking, soak the seedlings in 3-5% salt water for 5-10 minutes, or soak them in 1% povidone-iodine for 10-15 minutes. The stocking time is generally in mid-to-late May, and 30-40 mandarin fish seedlings of 4-6 cm in size are placed per square meter.

Feeding: Cage culture of mandarin fish, feed fish can be selected from dace, silver carp, bighead carp, crucian carp, etc. Among them, dace has the best breeding effect, low feed coefficient, and mandarin fish grows fast after feeding. Feed fish are required to be strong, uniform in size, free of disease and injury, and 1/3-1/2 of the length of mandarin fish. If the size is uneven, use a fish sieve to screen out oversized or undersized feed fish. Feed fish are disinfected and sterilized before being put into the cage. Due to the high density of cage culture, it is not advisable to feed too much feed fish each time. Feed once every 2-3 days in the early stage of stocking, and change to once a day as the mandarin fish grows up. Feeding time can be chosen in the evening when the mandarin fish is most active in feeding. The daily feeding amount is 5-10% of the body weight of the mandarin fish in the cage.

Daily management. Check the cages once in the morning, afternoon and evening every day. When there are insufficient feed fish in the cages, add them in time; if the feed fish are too large for the mandarin fish to eat, remove them in time. Clean the attachments of the cages regularly to facilitate the exchange of water inside and outside the cages, maintain a high level of dissolved oxygen in the water inside the cages, and promote the feeding and growth of mandarin fish. If the cages are found to be damaged, repair them in time to prevent the fish from escaping.

Fish disease prevention and control. Common diseases of mandarin fish in cage culture include gill rot, red skin disease, and wheelworm disease. In the season when fish diseases are prone to occur, use bleaching powder, copper sulfate and ferrous sulfate mixture, mandarin fish special insecticide and other drugs to alternately hang baskets and bags at the four corners of the cage for disinfection. Once the fish are found to be sick, correct diagnosis, appropriate medicine, and early treatment are required.

Harvest at the right time. After 3-4 months of breeding, some mandarin fish will reach the market size and should be caught and marketed in time to reduce the density in the box, allowing small-sized mandarin fish to continue to grow and increase breeding output.

1. Fish disease prevention and control

Mandarin fish are less susceptible to diseases.

If the fish is disinfected, there will be no fish disease.

Several points: ① Before applying the medicine, you must find out the type of fish disease and

② The best way to use the medicine is to hang it in a basket or hanging bag. The dosage can be appropriate.

When it is increased, the loss of medicine will be greater due to water convection;

③ When using the drug, it is best to gather the mandarin fish in a corner of the cage and cover it with plastic film.

The fish are gathered in one corner of the box and separated from the water outside the box for washing.

But you must strictly follow the instructions for the drug, otherwise it is easy to die.

Fish situation.

2. When to start the hunt

The mandarin fish with a body weight of 0.4 to 0.75 kg is called standard mandarin fish.

It is called over-standard mandarin fish. The price of standard mandarin fish is more than twice the price of over-standard mandarin fish.

Therefore, catching mandarin fish at the right time according to their weight is the best way to achieve higher economic benefits.

In daily management, it is necessary to keep track of the

Growth conditions, and according to market conditions, use the method of controlling feeding,

Adjust the growth rate of mandarin fish to achieve maximum economic benefits.

Disease prevention and control skills for mandarin fish (spotted mandarin fish, sweet-scented osmanthus fish) cage culture. Common disease prevention and control skills for mandarin fish cage culture. As we all know, due to the high stocking density and water flow of mandarin fish (spotted mandarin fish, sweet-scented osmanthus fish) cage culture, once the disease occurs, the infection speed is extremely fast. If traditional prevention and control methods are used, it is difficult to control, resulting in heavy losses. Because of the disease, the development of mandarin fish cage culture in Shandong, Jiangxi, Hubei and other places has been greatly restricted. In practical application, I have summarized a set of prevention and control methods for quickly curing mandarin fish (spotted mandarin fish, sweet-scented osmanthus fish) diseases for your reference: 1. Lift the cage (water depth of about 1 meter), first spray with 1.4PPM of camphor and neem (insecticide), and then spray with 6PPM of mandarin fish rescue star after 1 hour. 2. Spray 3 times within 24 hours. Generally, mandarin fish (spotted mandarin fish, sweet-scented osmanthus fish) will stop dying after 3 days. 3. Soak bait fish in Mandarin Fish Rescue before feeding. Mr. Zhang Hongliang (a member of Chengxintong) from Danjiangkou, Hubei, had his Mandarin fish suffering from wheelworm disease and gill rot, with more than 100 fish dying in each cage every day. This method was used to cure the disease. This successful method is also used to prevent and control diseases of Mandarin fish in cages in Shandong, Jiangxi and other places.