CATDOLL : CATDOLL: How much area is China cultivating seafood? How many fish farming bases are there in China?

1. What is the area of ​​seafood farming in China?

China is a major country in marine aquaculture. In 2019, China's marine aquaculture area was 1992,180 hectares. By water area: offshore aquaculture area was 1105,760 hectares, accounting for 55.51%; tidal flat marine aquaculture area was 584,780 hectares, accounting for 29.35%; other marine aquaculture area was 301,640 hectares, accounting for 15.14%.

2. How many fish farming bases are there in China?

Fishing ground location: 38°30′N north of Bohai Sea, with an area of ​​about 11,520 square nautical miles

Fishing targets: small yellow croaker, hairtail, prawn, jellyfish, hair shrimp, wing crab, Spanish mackerel, yellow croaker, red sea bream, plum fish, bluefin mullet, hairtail, Spanish mackerel

Nature of the fishing ground: It used to be an important fishing ground for yellow croaker, hairtail, prawns, etc. In recent years, the above resources have declined and no longer form a fishing ground. Only jellyfish, hair shrimp, and wing crabs are produced.

Nature of the fishing ground: It was once an important fishing ground for hairtail, but with the decline of hairtail in the Yellow Sea, the fishing ground has disappeared

Fishing ground location: Northern Yellow Sea, north of 38°00′N, covering an area of ​​about 7,200 nautical miles

Fishing Target: mullet, sand eel, lionfish, bighead carp, mackerel, flatfish, flounder, cod, mackerel, prawns, croaker, yellow croaker, hairtail, ribeye, jellyfish

Fishing ground location: west of 119°00′N in Bohai Sea, covering an area of ​​about 3,600 square nautical miles

Nature of the fishing ground: It was once an important fishing ground for yellow croaker, prawns, blue mackerel, etc., and is currently mainly used for fixed nets and some near-shore operations.

Fishing ground location: 38°30′N south of Bohai Sea, near the mouth of the Yellow River, with an area of ​​about 6,480 square nautical miles

Nature of the fishing ground: It was once the most important fish spawning ground in northern my country. In recent years, due to resource decline, the fishing ground has disappeared, and only some near-shore nets are used to produce small fish, shrimps, swimming crabs, and hair shrimps.

Fishing ground location: Northern Shandong Peninsula, south of 38°30'N, covering an area of ​​about 7,200 square nautical miles

3. What is the area of ​​seafood farming in China?

In 2020, the national aquaculture area was 7036.11 thousand hectares, a year-on-year decrease of 1.02%. Among them, the marine aquaculture area was 1995.55 thousand hectares, a year-on-year increase of 0.17%; the freshwater aquaculture area was 5040.56 thousand hectares, a year-on-year decrease of 1.48%.

4. Which marine fish contain more histidine?

Mainly marine fish with green skin and red meat, such as mackerel, herring, sardines, as well as trevally, horse mackerel, mackerel, bonito, tuna, mackerel, herring, sardines and other marine fish with green skin and red meat, which are rich in free histidine.

This type of fish contains a higher amount of histidine. After being acted upon by some bacteria, under suitable conditions, the histidine in the fish meat is decarboxylated by enzymes to produce histamine and a histamine-like substance - saury.

5. Fish breeding techniques?

1.

Stocking time selection: Fish should be released on sunny days when the temperature is not too low. Generally, the temperature should be between 2℃ and 5℃. At this stage, the fish scales 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 fish scales are loose and the activity is large, which is easy to injure the fish during operation.

2.

Stocking of fish: Before stocking the fish, check whether the drugs have lost their effectiveness after pond cleaning. 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 fish.

3.

Feeding at the right time When the water temperature rises to 810℃, 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 expanded 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 the physique, and improve immunity.

Four,

Add organic fertilizer to improve the fertility of the water body. Sanyingshuiwang organic biological fertilizer has a long-lasting fertilizer effect. Yizaoyuan promotes algae growth and quickly fertilizes the water. After the fish pond is cleaned, frozen, and disinfected in winter, the fertility of the water body is low. As the saying goes, raising fish starts with raising water, so fertilizing the pond water is particularly important. In spring, it is best to apply organic fertilizer. It is recommended to use biological fertilizers rich in various trace elements [Sanyingshuiwang] or Yizaoyuan, which are rich in trace elements. The specific amount of fertilizer and frequency should be determined according to the quality of pond water and fertilizer.

The general principle is: early spring, large amount and few times, late spring, small amount and many times. Make the pool 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, maintained at about 30 cm, the water temperature is low in early spring, it should be controlled at 20-30 cm, the temperature is high in late spring, it should be controlled at 25-35 cm, the water quality should be kept rich, active, tender and refreshing.

6. What are the quality requirements for farmed fish?

1. Fish species

1. Different species of fish have different protein and fat content in their muscles, different meat structures, and large differences in price.

2. Different species of fish have different contents of amino acids that make up the protein in the fish meat, such as lysine, arginine, glutamic acid, aspartic acid, alanine, etc., and the taste is also different.

3. The types and proportions of fatty acids in fish fat, especially the proportion of docosahexaenoic acid (DHA), also vary, resulting in different tastes of fish.

4. DHA is a natural melatonin and an essential nutrient for the human body. Fish with high DHA content include tuna, bonito, salmon, mackerel, etc.

5. The content of the above-mentioned amino acids and DHA in the muscles of marine fish is higher than that of freshwater fish, so marine fish tastes better than freshwater fish.

6. In aquaculture, the selection of breeding species must meet the following conditions: choose suitable breeding species based on the local breeding environment and climatic conditions; examine whether they have market development prospects; the selected breeding species must not have any difficulties in terms of seedlings, feed, etc.; be able to master the feeding and management techniques of the breeding species, and invite breeding experts for regular guidance, etc.

2. Aquaculture water environment

1. Aquaculture requires sufficient water resources, fresh water quality and no pollution.

2. First, establish a farm in a place with sufficient water resources, up-to-standard water quality, convenient irrigation and drainage, and convenient transportation. Secondly, cultivate good water quality. During the breeding process, pay close attention to changes in water temperature, transparency, dissolved oxygen, pH value, etc. to ensure that the water quality always remains "rich, active, tender, and refreshing."

3. Feeding

1. Feed is the material basis for farmed fish to survive. The balance between protein, fat, carbohydrates and vitamins in the feed is crucial. Fish eating high-quality and fresh feed can improve their physiological state and immunity, and increase their survival rate. Fish farmed in this way have good color, normal body shape, strong vitality, firm fish meat and good taste.

2. Feed feeding: select palatable, high-quality, fresh feed according to the physiological characteristics of fish, and strictly follow the "four determinations" principle for scientific feeding; adjust the feeding amount in time according to weather conditions and fish feeding conditions; make full use of the breeding space of the water body, adopt a mixed breeding method of multiple varieties, rationally utilize the natural bait and artificial feed in the water body, improve the breeding water environment, and improve the breeding efficiency.

4. Use of fishery drugs

1. In the process of aquaculture, when cleaning ponds and disinfecting, seedlings and feeding tools, and adjusting water quality, the selection of fishery drugs should be scientific and reasonable, and special attention should be paid to the usage and dosage to prevent the quality of farmed fish from being affected by improper use of drugs.

2. The use of fishery drugs should be based on different aquaculture species and different pathogenic factors. Appropriate national standard fishery drugs should be selected, and treatment should be carried out according to the prescribed dosage, usage method, and course of treatment, and the regulations on drug withdrawal periods should be strictly implemented.

3. In breeding, we should start from the nutritional needs of animal growth, feed hygiene, breeding management and other aspects to reduce the occurrence of diseases and ensure human food safety.

7. What is the largest farmed fish?

grass carp

The fish with the highest annual output in my country is grass carp (one of China's four traditional freshwater farmed fish). The development of the six major freshwater farmed fish species is converging, with grass carp firmly in the first place and bighead carp surpassing carp to enter the top three.

8. What are the quality requirements for farmed fish?

When conducting aquaculture, it is necessary to ensure that the dissolved oxygen content, pH range, ammonia nitrogen content, nitrite content, salt hydrogen sulfide content, total alkalinity, total hardness and the number of Vibrio in the pond water are within the normal range.

Dissolved oxygen content: The dissolved oxygen content in the water of the farm must not be less than 2mg/L in 24 hours a day. It must also be ensured that the dissolved oxygen content is greater than 4mg/L for 8 hours at night, and within 8-14 hours, the dissolved oxygen content must not be less than 5mg/L.

9. What are the four models of fish farming?

Including: open breeding, intensive breeding, circulation breeding and isolated breeding. 1. Open breeding is to release fish directly into natural waters. Due to the large water space and natural breeding environment, fish can grow and reproduce freely. This model has the advantages of low cost and abundant resources, but it is also susceptible to restrictions and losses in the natural environment. 2. Intensive breeding is in a closed water body, where fish are concentrated in a small area and the growth of fish is managed and promoted through factors such as artificial feeding and water quality control. This model can efficiently utilize limited feed and water resources, and is conducive to monitoring and controlling the spread of diseases during the breeding process, but there may be problems such as environmental pollution and fish competition. 3. Circulation breeding is to combine water quality treatment technology to complete fish breeding and water recycling within a certain range. Through biological filtration and water flow treatment systems, water quality is kept clean, wastewater discharge is reduced, and breeding efficiency and environmental sustainability are improved. 4. Isolated breeding is to keep fish in closed facilities, completely isolated from the external environment. By controlling factors such as temperature, humidity, and oxygen, a suitable breeding environment is created to improve growth efficiency and quality stability. This model is suitable for the breeding of special fish species, but the cost of facility construction and maintenance is relatively high. In summary, the four models of fish breeding have their own advantages and disadvantages. Choosing the right model requires considering multiple factors such as breeding species, economic costs, and environmental factors.

10. What fish are suitable for breeding in Yunnan?

Silky tail fish. It is found in the Lancang River system in my country and also in Southeast Asia.

The Dianchi high-magnitude crucian carp is a natural triple-magnitude crucian carp population formed in Dianchi Lake and other lakes in the 1970s, all of which are magnetic.