CATDOLL : CATDOLL: Which is better, Guoxin No. 1 or Deep Blue?

1. Which is better, Guoxin No. 1 or Deep Blue?

"Guozhou Xinxin No. 1" is the world's first 100,000-ton smart fishery aquaculture vessel. On January 25, 2022, it was successfully launched from the Qingdao Beihai Shipyard of China Shipbuilding Corporation. The blue and white "Guoxin No. 1" is like a crouching dragon lying on the waves, quietly embedded on the sea. The entire giant ship is as big as two Liaonings.

The staff on the boat stared at the screen nervously, and all kinds of machines were busy: fish sucking, pre-cooling, sorting, chilling and other processes were running like an assembly line. It only takes 45 minutes for the caught yellow croaker to be packed and shipped out. On the other side, Ms. Bi, who lives in Shaanxi Province, was tapping the "little yellow car" on the short video platform.

Two days later, a fresh yellow croaker from the deep sea will be delivered to the door by a courier and served on the dining table of ordinary people.

Deep-sea fish is a high-quality source of protein. The latest version of the dietary guidelines recommends that people should consume fish twice a week or 300-500 grams. Since the founding of New China, countless scientific and technological personnel have passed on the torch and dedicated their lives and wisdom to this cause in order to allow Chinese people to eat fish and eat good fish.

Since September 1 this year, the yellow croakers raised in the cabin of the "Guoxin No. 1" ship have been caught and put on the market one after another, and high-quality yellow croakers comparable to those in the wild have "swimmed" onto the tables of ordinary people.

This "aircraft carrier" of fishery farming integrates a large number of innovative technologies, opens up a new track in the field of fishery production, and drives the Chinese people's yearning for a better life into a new era.

2. Yellow croaker farming

1. Breeding conditions. Pond breeding can be selected. The pond should be close to the water source, with convenient drainage and irrigation, and can be changed every day. The area of ​​the pond depends on the scale of breeding. The depth of the pond should be 2-3 meters. The transparency of the pond water should be more than half a meter, the water temperature should be kept at 8-28 degrees, the dissolved oxygen should be kept at more than 5 milliliters per liter, and the pond water should be alkaline.

2. Stocking. Stocking is done in mid-to-late April or early May, when the water temperature is suitable for the growth of fry. When stocking, attention should be paid to the requirement that the size of the fish species should be uniform and consistent, which is conducive to management. If the size difference is too large, it will cause food snatching, which is not conducive to feeding management.

3. Feeding: During the period of juvenile yellow croaker, they mainly feed on copepods, mysid shrimps, krill and other zooplankton, while adult yellow croakers mainly feed on fish or crustaceans such as shrimps and crabs.

3. Can yellow croaker be farmed?

Question 1: Can yellow croaker be farmed? Farming technology

Yellow croaker was once one of the important economic fish in my country. It is a local species unique to China and is widely distributed from the southern Yellow Sea in the north, through the East China Sea and the Taiwan Strait, to the east of the Leizhou Peninsula in the South China Sea. This fish is a warm-temperate schooling fish that often lives in the middle and lower layers of the nearshore waters within a depth of 60 meters. The reproductive season of yellow croaker is spring and autumn. During the reproductive period, the fish migrate in batches from the wintering areas in the open sea to the nearshore for reproduction. After spawning, the young fish grow up in the nearshore and disperse to feed. As the water temperature drops, some fish swim to the warm waters of the 60-meter isobath to overwinter. As a precious economic fish, yellow croaker has long been favored by consumers. However, due to overfishing, the resources have been severely damaged.

After years of research, batch breeding began in 1990, and commercial fish farming has been continuously expanded since 1992, with production increasing year by year. The breeding provinces started from Fujian and radiated to Zhejiang, Guangdong, Hainan and other provinces. The breeding method has expanded from cage breeding to pond breeding. The specifications of the stocked fish species are required to be uniform. If the commercial specifications of more than 400 grams are planned to be reached that year, the specifications of the stocked fish species should be around 100 grams. The bait in the growing stage is generally based on frozen upper layer fish, supplemented with powdered compound bait. The upper layer fish is cut into palatable fish meat blocks with a knife, which is easy to process and not easy to lose, or the fish is minced into minced meat, mixed into a ball-shaped bait with strong dryness, and squeezed into blocks of different sizes by hand for feeding. Fish meat paste has more advantages than fish blocks: it can be mixed with some powdered compound bait or other baits, and necessary vitamins and drugs can also be added, which is nutritious.

During the culture period, feed is generally given once in the morning and once in the evening. Compared with red sea bream and mullet, yellow croaker has the characteristics of slow feeding and small amount. Therefore, feeding should be slow. It grows fastest during high temperature. In order to maintain the natural golden color of commercial fish. In the later stage of culture, it is necessary to cover the net cage with shade to control the light. The best water temperature for growth is 22-26℃. Salinity is 1.8%-2.5%, dissolved oxygen is more than 5 ml/L, and pH is 8.0.

Question 2: What is the difference between wild yellow croaker and farmed yellow croaker? 1. Dorsal fin. The dorsal fin of wild yellow croaker is serrated and transparent or slightly yellow in color; the back of farmed yellow croaker is rough and grayish white in color. 2. Body width. Wild yellow croaker is smaller in size, while farmed yellow croaker is larger in size.

3. Trunk. The trunk of wild yellow croaker is thin and skinny, while that of farmed yellow croaker is thick and fat.

4. Viscera: The viscera of wild yellow croaker are clean, while those of farmed yellow croaker are dirty.

5. Fish lips. Wild yellow croaker lips are yellow and have a lot of tartar, which is firm, while farmed yellow croaker lips have less and are easy to fall off. 6. Taste. Wild yellow croaker lips feel very sticky when eaten, while farmed yellow croaker lips have very poor stickiness, which is most obvious when stewed.

Question 3: Can yellow croaker be raised in the south? Yes! However, this species grows fastest during high temperatures. In order to maintain the natural golden color of commercial fish, cover the net cage with shade to control light in the later stage of breeding. The best water temperature for growth is 22-26℃. Salinity is 1.8%-2.5%, and dissolved oxygen is more than 5 ml/L.

Question 4: Are the small yellow croakers we eat farmed? The fish and meat sold in the market are all farmed. There are fewer and fewer fish caught.

Question 5: How to distinguish between wild and farmed yellow croaker? Industry insiders said that when buying yellow croaker, you need to learn to distinguish carefully. Generally, there are fewer wild yellow croakers during the fishing moratorium. The appearance and taste of farmed yellow croaker and wild yellow croaker are very different. From the appearance, the wild yellow croaker is more yellow, the fish mouth is more red, the fish body is more slender, and the belly is small. Because of the living environment, the mouth and eye circles of wild yellow croaker will appear larger, the scales are thicker, and the meat is arranged relatively tightly. It is chewy and delicious. Farmed yellow croakers are fatter, the belly is more swollen, the skin color is dark yellow or grayish white, and the lips are light in color because they live in cages more leisurely and lack exercise. In addition, the fins of wild yellow croaker are generally clean and complete, the fins are longer, and when they are caught from the sea, the fish bladder explodes due to the reduction of air pressure, and they die without much painful struggle. The scales and fins on the body will not leave any signs of congestion. Those fins look a little red, a little damaged, and the fins are short; those with red spots and scars on the body can be sure that they are farmed. Because artificially farmed yellow croakers are generally kept in cages, they are easily injured when swimming in a small space. At present, some deep-sea farmed yellow croakers look similar to wild yellow croakers, but the meat tastes a little soft and the taste is not as pure as wild ones. Wild yellow croakers are also divided into large yellow croakers and small yellow croakers. They are not only distinguished by the size of the body and the head. Generally speaking, large yellow croakers can grow to more than 50 centimeters, while small yellow croakers can only grow to more than 20 centimeters. Some customers also regard small large yellow croakers as small yellow croakers. In fact, the main difference between the two is the tail, scales, and upper and lower jaws. The tail of the small yellow croaker is short and thick, and the scales are large, while the tail of the large yellow croaker is slender and the scales are slightly smaller. The lower jaw of the large yellow croaker is slightly protruding, while the upper and lower jaws of the small yellow croaker are basically level.

Question 6: How to distinguish whether the yellow croaker is wild or farmed? 1. In fact, it is not complicated to distinguish whether the yellow croaker is dyed: the yellow color on the belly of the real yellow croaker is natural light yellow, and the belly and fins are darker and will not fade; while the dyed color is easy to fade, and it is more obvious after the fish is thawed. 2. Yellow croaker and yellow croaker are similar in appearance, and the biggest difference is that yellow croaker has a distinct yellow color, while yellow croaker is blue-gray. Expert explanation: Illegal merchants "stealing and replacing the original" But a marine fish expert from the Chinese Academy of Fishery Sciences told reporters that based on the reporter's description, it can be judged that the market is not selling yellow croaker, but "yellow croaker". The expert said that the production of yellow croaker (i.e. large yellow croaker) in my country's waters is very small, and there are no large fish schools at present, so the price is relatively expensive and cannot be less than 10 yuan. Therefore, there are often illegal merchants in the market who dye yellow croaker with artificial pigments such as sunset yellow or lemon yellow and sell them as yellow croaker. It is easy to distinguish them: the yellow color on the belly of real yellow croaker is natural light yellow, and the abdomen and fins are darker in color and will not fade; while the dyed pigments fade easily, and it becomes more obvious after the fish is thawed.

Please accept it, thank you!

Question 7: Artificial breeding of large yellow croaker At present, there are many breeding modes for large yellow croaker, such as cages, enclosures and earthen ponds, all of which have achieved significant results and good economic benefits. Here we introduce the cage breeding of large yellow croaker. The cage setting of large yellow croaker in the growing stage is basically the same as the requirements in the fish breeding stage, except that the specifications of the cages and the mesh size change as the fish grows. The depth of the growing cage is generally between 3.5 meters and 4.0 meters, and the mesh size is between 20 mm and 60 mm. In order to avoid scratches on the fish body, it is better to choose a softer nodular mesh as the net material. Fish stocking 1. Selection of fish species The stocked fish species should be selected with a symmetrical body shape, strong physique, complete body scales, and no disease or injury. The specifications of the fish species stocked in the same cage are required to be neat and consistent. For the cages that are planned to reach a specification of more than 400 grams in the same year, the size of the stocked fish species should be around 100 grams. 2. Transport of fish species There are many ways to transport fish species, such as live water boats, live water trucks, fish baskets, water tanks, plastic bags filled with oxygen, etc. For long-distance transportation of productive batches, live water boats are preferred. It is generally better to transport fish species in late autumn when the water temperature drops to 18℃~16℃, or in spring when the water temperature rises to above 13℃. Fish species during the disease period or after being full should not be shipped. Live water boat transportation should be carried out in warm and windy weather. The reference density of live water boat transportation for transportation time exceeding 24 hours is 500 fish/cubic meter (specification 75 grams), that is, about 40 kilograms/cubic meter. The density of transportation in other water bodies is much smaller than that of live water boat transportation. 3. Stocking of fish species In cages in fast-flowing sea areas, stocking of fish species should be selected during low tide. After the fingerlings are transported to the cage area, they can be soaked and disinfected with a high concentration of antibiotics and a freshwater solution with an appropriate amount of formalin in combination with the time interval between catching the fish and putting them into the cage. When using a closed water body to transport the fingerlings, avoid sudden changes in water temperature and other conditions when entering the cage. A short transitional treatment can be carried out by adding seawater from the cage area to the transport water body. The stocking density of the fingerlings is determined according to the water flow in the cage and the specifications of the fingerlings. The reference density is about 25 fish/cubic meter for 75 grams, and the density before harvest is 12 fish/cubic meter to 14 fish/cubic meter, that is, 6 kg/cubic meter to 7 kg/cubic meter. Feeding 1. Types and processing of feed The feed for large yellow croaker in the growing stage is generally based on frozen mackerel and mullet, supplemented with powdered compound feed, and fed after processing. Processing method: First, use a knife or a meat slicer to cut the mackerel and mullet into palatable fish pieces. This method is easy to process and is not easy to collapse in water. The disadvantage is that it is not convenient to add additives and the nutrition is relatively simple. The second is to mince the frozen fish and mix it into a sticky ball feed, squeeze it into blocks of different sizes by hand, and put it into the net cage. This method can be mixed with some powdered compound feed, or other fish, shellfish and other feeds, and it is also convenient to add vitamins, etc., and the nutrition is comprehensive. Large yellow croaker is a carnivorous fish with a high demand for protein. According to preliminary experiments, the protein content of artificial compound feed in the cultivation stage should be around 45%, and the carbohydrate content should be controlled at around 5%. Frozen mackerel is easily oxidized during the thawing process, the color becomes darker, the meat becomes soft, and the quality is significantly reduced. For this reason, before processing, it is advisable to use mechanical methods to break up the frozen fish, then soak it in seawater for a while, let the surface of the feed fish thaw, and drain the water for processing. The fish paste processed by this method is lighter in color and better in freshness. Mackerel fish should not be thawed by soaking for a long time or sunlight heat. During the high temperature period, it is also good to feed fish with powdered compound feed or floating extruded feed. The effect is better if powdered compound feed and floating extruded feed are used alternately. When using floating extruded feed, the feed should be soaked in fresh water at a ratio of 1:1.5 for 20 to 30 minutes to allow the feed to absorb water completely before feeding. Due to the large amount of frozen fish in the head and tail of the feeding process, the artificial compound feed has caused a large amount of bait pollution, and the problem of frequent diseases of yellow croaker has followed. In 2012, drawing on the research results of largemouth bass, Shanghai Ocean University and Shanghai Nonghao Feed Co., Ltd. trial-produced a complete compound feed for yellow croaker, and conducted a productive breeding test in Ningde. The results show that compound feed can completely replace frozen fish; at the same time, the products raised with compound feed have obvious advantages in color and flavor compared with those raised with frozen fish, and can be comparable to the products of local large cage breeding (semi-wild). Raising yellow croaker with compound feed can solve the problem of frequent diseases of yellow croaker caused by bait pollution to a certain extent, and will play a huge role in the development of the yellow croaker industry......>>

Question 8: The current price of a farmed large yellow croaker per pound is 40.0 yuan/kg at the Baliqiao Agricultural Products Center Wholesale Market in Tongzhou, Beijing.

Large yellow croaker Hohhot Dongwayao Wholesale Market 48.0 yuan/kg

Large yellow croaker, Inner Mongolia Baotou Friendship Vegetable Wholesale Market, 56.0 yuan/kg

Large yellow croaker Dalian Shuangxing Wholesale Market 44.0 yuan/kg

Large yellow croaker Anhui Hefei Zhougudui Agricultural Products Wholesale Market 37.0 yuan/kg

Question 9: Does anyone know if yellow croaker can be farmed? Farming technology

Yellow croaker was once one of the important economic fish in my country. It is a local species unique to China and is widely distributed from the southern Yellow Sea in the north, through the East China Sea and the Taiwan Strait, to the east of the Leizhou Peninsula in the South China Sea. This fish is a warm-temperate schooling fish that often lives in the middle and lower layers of the nearshore waters within a depth of 60 meters. The breeding season of yellow croaker is spring and autumn. During the breeding season, the fish migrate from the wintering areas in the open sea to the nearshore in batches. After spawning, the young fish grow up in the nearshore and disperse to feed. As the water temperature drops, some fish swim to the warm waters of the 60-meter isobath to hibernate. As a precious economic fish, yellow croaker has long been favored by consumers. However, due to overfishing, the resources have been severely damaged.

After years of research, batch breeding began in 1990, and commercial fish farming has been continuously expanded since 1992, with production increasing year by year. The breeding provinces started from Fujian and radiated to Zhejiang, Guangdong, Hainan and other provinces. The breeding method has expanded from cage breeding to pond breeding. The specifications of the stocked fish species are required to be uniform. If the commercial specifications of more than 400 grams are planned to be reached that year, the specifications of the stocked fish species should be around 100 grams. The bait in the growing stage is generally based on frozen upper layer fish, supplemented with powdered compound bait. The upper layer fish is cut into palatable fish meat blocks with a knife, which is easy to process and not easy to lose, or the fish is minced into minced meat, mixed into a ball-shaped bait with strong dryness, and squeezed into blocks of different sizes by hand for feeding. Fish meat paste has more advantages than fish blocks: it can be mixed with some powdered compound bait or other baits, and necessary vitamins and drugs can also be added, which is nutritious.

During the culture period, feed is generally given once in the morning and once in the evening. Compared with red sea bream and mullet, yellow croaker has the characteristics of slow feeding and small amount. Therefore, feeding should be slow. Growth is fastest during high temperature. In order to maintain the natural golden body color of commercial fish. In the later stage of breeding, shade should be added to the net cage to control the light. The best water temperature for growth is 22-26℃. Salinity is 1.8%-2.5%, dissolved oxygen is more than 5 ml/L, and pH is 8.0. Lao Yinjia Sea Cucumber provides you with answers