CATDOLL : CATDOLL: How to improve the efficiency of pig farming?

1. How to improve the efficiency of pig farming?

Answer: In the current management and breeding of many pig farms, it is believed that the development of contemporary pig farming is becoming more and more difficult and the risks are increasing, such as high-risk epidemics, unstable market changes, etc. So let us see how to improve the efficiency of pig farming.

1. Animal Nutrition and Welfare

At present, most large-scale pig farms use positioning pens, farrowing raised beds and other feeding methods for the purpose of intensification and scale. This occupies a small area and is conducive to saving labor. However, in the long run, it is not conducive to the production of breeding pigs, shortening the production period of breeding pigs and increasing the overall cost. Under normal circumstances, a sow can produce for 8 to 10 years, but nowadays most of them are between 3 and 5 years. In view of this situation, the exercise of the breeding pig group can be appropriately increased. Pig farms with conditions can add 1 to 2 kg/day of green feed to enhance nutrition, such as Dingmu'an, Ti Zhuangsu and other vitamins and trace elements: the positioning pen can be changed to a large pen for exercise (enter the exercise pen after 30 days of pregnancy to prevent fighting)

2. Relieve immunosuppression

Nowadays, epidemics are becoming more and more complicated. Problems arise mainly due to immunosuppression, mixed infection and low cure rate. In addition, feed contamination and the negative effects of some antibiotics (sulfonamides, fluphenazine, dimethoate, chloramphenicol, and oxytetracycline all cause immunosuppression) have a greater impact on immunosuppression. This has a lot to do with our usual medication and health care habits.

3. Antibiotics

Health care is based on scientific immunization procedures and supplements them. In addition to synthetic chemical antibacterial drugs, antibiotics are generally produced by fermentation and are important partners of humans. The abuse of antibiotics and hormones has an inhibitory effect on the innate immunity and growth and development of animals, and pathogens continue to mutate and have strong drug resistance. In particular, the frequent use of high-priced new veterinary drugs has led to epidemics that are incurable. Some pig farms have used all methods after the disease occurs, until all the pigs that should die have died, and the disease is considered cured. I am not opposed to the use of antibiotics, but they must be used scientifically, combined with biosafety and health care based on the actual situation of the farm, try to use low-priced veterinary drugs, and strictly add them according to the preventive amount. The time of medication should be different for different pig groups. It is generally recommended to use it once every 30 to 60 days, with a cycle of 5 to 7 days, and use medium and high-end veterinary drugs for treatment.

IV. Application of Probiotics

Microecological preparations include probiotics, enzyme preparations, oligosaccharides, bacteriocins and other products. Biological additives will develop in the direction of complex, special and specific types, with outstanding functions and good effects: Microecology also has the function of improving the body's immunity and changing the intestinal absorption function (small peptides, lactobacillus), increasing growth rate and reducing feed-to-meat ratio. Sows are the most laborious production function. They are constantly pregnant and giving birth under high reproduction frequency and fixed living space, and they are also injected with quite a lot of vaccines. Therefore, their physical constitution and health directly affect production and piglet health. It is even more important to use microecological preparations in the sow stage. Piglets will complete 90% of the immunization injections before 30Kg, which is also a critical period of physiological development (such as Dingzai'an: synbiotics, etc.), so the microecological health of piglets is also very important.

Hardware conditions are the foundation for raising pigs well and the premise for ensuring the regulation of the pigs' living environment. For new pig farms, scientific planning must be carried out to improve the level: for existing pig farms, improvements should be made if possible, and if not, manual management should be strengthened to maintain appropriate density and a good sanitary environment, provide good lighting and ventilation, and provide a good microenvironment: temperature, humidity and sanitary management are especially key. In short, raising pigs is more important than prevention, and prevention is more important than treatment. The combination of raising, prevention and treatment can improve the comprehensive benefits of breeding.

2. How to improve the efficiency of dairy cattle farming?

As the quality of life of the people continues to improve, the demand for milk is also increasing. I have the following opinions on how dairy farmers can improve their farming efficiency:

1. Improve milk quality and prevent and treat dairy cow diseases

In dairy cow breeding, limb diseases, uterine diseases and mastitis are the most likely to occur. These are common diseases that seriously affect the lactation of dairy cows and are extremely harmful. Therefore, in the process of dairy cow breeding, a comprehensive prevention and control method combining prevention with feeding management should be adopted to improve its breeding efficiency. By strengthening the disinfection of the cowshed environment, strictly implementing the correct milking operation procedures, and regularly conducting disease screening, problems can be discovered and solved in a timely manner.

2. Breeding high-yield dairy cows

An important problem in my country's early dairy farming was low milk production and poor milk quality. How to eliminate low-yield dairy cows and introduce and cultivate high-yield dairy cows that are suitable for my country's farming is an important issue. In the early days, my country spent a high price to introduce high-yield dairy cows from foreign countries. Their milk production was several times that of Chinese dairy cows. Through breeding with local dairy cows in my country, my country gradually cultivated a group of high-yield dairy cows, but their number has not been expanded on a large scale. Therefore, choosing high-yield dairy cows is a necessary choice for farmers to improve their efficiency.

3. Establish a risk-benefit sharing mechanism between dairy farming enterprises and milk processing enterprises

Nowadays, many farmers in my country choose to share risks and benefits with corresponding processing companies. This model can prevent the problem of farmers' milk not being sold and the price not being high when there is excess milk production capacity, and can effectively avoid the risks brought by market uncertainties. At the same time, companies will also expand their milk sales channels and increase demand for milk for their own interests. Dairy farmers can expand the scale of breeding and increase breeding benefits in a relatively safe situation.

Finally, we welcome everyone with other insights to discuss below!

3. How to improve the efficiency of cucumber planting?

1. Apply organic fertilizer

The well-developed root system of cucumber can ensure sufficient nutrition supply and healthy growth of the plant. If the root is infected or the root volume is small, the nutrition supply will be unbalanced, which is not conducive to improving the marketability. Since the activity of cucumber rhizosphere microorganisms is particularly important for the root nutrition of the plant, organic fertilizer needs to be applied during planting. The organic fertilizer fermented by Rujin Planting Special (original solution) is non-toxic and harmless, and can also supplement the probiotics in the organic fertilizer, which not only increases the number and activity of beneficial bacteria in the rhizosphere soil, effectively preventing soil-borne diseases, but also enhances soil fertility, promotes root growth, and effectively improves marketability.

2. Don’t leave too many melons

If the melons are too dense, it will not only lead to insufficient nutrition, short melon strips, slow growth, and reduced marketability, but also cause vines to fall and affect yield. Therefore, it is necessary to thin the melons in time, generally leaving one melon after three leaves, so as not to affect the normal growth and development of the melon strips and stems.

3. The falling vines should not be too low

Vine removal is an important management technique that can evenly distribute leaves, maintain a reasonable lighting position, maintain the best leaf coefficient, and improve photosynthetic efficiency, thereby enhancing growth potential and extending the fruit-bearing period, directly affecting the yield and quality of cucumbers, and also facilitating agricultural operations. However, vine removal should not be too low at one time, so as to avoid too few effective leaves, insufficient supply of photosynthetic products, affecting the development of cucumber strips and causing a reduction in yield. For cucumbers to complete normal photosynthesis, each plant is required to have 16 to 20 functional leaves, and generally vine removal of 0.4 to 0.5 m is appropriate each time.

4. Picking at the right time

The commercial cucumbers are usually about 30-35cm long and 2.5cm in diameter. Generally, they can grow into commercial cucumbers and be picked 7-8 days after the flowers bloom. If they are picked too early, the yield will be low. Although they are tender, they have less juice and poor flavor. If they are picked too late, the cucumbers will become thick, with thick and hard skin, poor quality, reduced commercial quality, and difficult to sell. In addition, the fallen vines will hinder the growth of other cucumbers. Therefore, it is necessary to pick the cucumbers at the right time.

5. Microbial Agents

Rujin Planting Special (original solution) can not only ferment organic fertilizer, but its most important function is to increase crop yields. Rujin fungus not only makes cucumber seedlings strong and vigorous through measures such as seed soaking, root irrigation, and leaf spraying, but also has a significant effect on improving the fruit setting rate of cucumbers.

4. How to improve the economic benefits of wild boar farming?

Answer: When raising wild boars in the mountains, you must first choose good breeds, which generally refers to pig breeds with good quality, fast growth, high stress resistance, stable traits, and the ability to adapt well to the natural conditions of a certain area and suitable for large-scale breeding. You need to determine the breed based on your own breeding purpose.

Selection of wild boars The appearance of wild boars for breeding should be gray-black or brown-red, with coarse and sparse hair, small ears, long and pointed mouth, small head and abdomen, thin and high feet, straight back without concave, and sharp teeth. At the same time, it is required that the sexual characteristics are obvious, the forequarters are deep and wide, the sexual function is vigorous, and the testicles are well developed; wild boars over 18 months old are tolerant of rough feed, eat quickly, eat a large amount, and are not picky eaters. Such wild boars have strong breeding performance. Wild boars were originally wild animals, and their main food is leaves and weeds. 60%~70% of the feed for artificial breeding should be green feed such as grass and vegetables.

Some farmers feed wild boars with complete feed, and do not limit the amount of feed in the early growth period. The nutritional level is too high, which makes the wild boars too fat, making it difficult for them to climb or mate normally. Therefore, wild boars should be properly restricted, mainly green feed, and exercise should be strengthened. Good management of wild boar breeding is the key to improving the breeding rate. Attach importance to breeding work. Wild boar dens are divided into inner dens and outer dens. The inner den is a place for "wild boars" to eat and sleep, with an area of ​​about 3.5 meters long and 2.5 meters wide; the outer den is a place for exercise, sunbathing and drinking water. A drinking trough is set up, with an area of ​​1.5 times that of the inner den. The inner and outer dens are mostly paved with cement mortar, but not too smooth, to keep the pens dry and clean. The difference between the "wild boar" and the domestic pig pens is that a passage must be built 1.2 meters away from the outer den to allow the breeding boar to enter any sows in estrus for breeding, and then return to the original room for breeding. 2. Feed formula: 20% corn flour, 33% wheat bran, 8-10% bean dregs or a little soybean Feeding technology Panax notoginseng sugar 22%, bone meal 0.5%, amino acid (per head per day) 15-40g iodized salt 0.5kg, green feed 15% 3. Disease prevention and control: ① Prevention and control of swine fever: Prevention and control of anti-swine fever disease: Anti-swine fever serum is injected intramuscularly 5ml each time, twice a day, for 3-4 consecutive days. A large dose (50 heads) of swine fever immune attenuated vaccine can also be used for subcutaneous intramuscular injection once. ② Prevention and control of swine pleuropneumonia: first inject penicillin 1.8 million × 2 intramuscularly (weight over 75 kg), then inject ofloxacin 5 ml × 2, twice a day, for three consecutive days, the effect is very good, ③ Prevention and control of swine erysipelas: This disease is also called "fighting mark". The treatment method can be deep intramuscular injection of 40,000 units of penicillin per kilogram of body weight, twice a day, for 3 to 5 consecutive days, and wipe the pig body with strong soapy water, rub it into a state where soap bubbles cover the pig body, which has a miraculous effect. Fattening method for special wild boars The staged fattening method of special wild boars not only saves a lot of concentrated feed, but also makes full use of green roughage to make up for the defects of slow growth and long fattening period of special wild boars. It reduces production costs and improves the quality of wild boar meat. It is a key technology for special wild boar breeding to obtain high benefits. If this technology is not mastered well, it may cause the decline of special wild boar meat quality and increase production costs, thus putting special wild boar breeding into a dilemma. On the one hand, there is no difference between the special wild boar meat produced and the ordinary domestic pork; on the other hand, the production cost of special wild boars is much higher than that of ordinary domestic pigs and they are eliminated by the market. The linear fattening method is also called the consistent fattening method. This fattening method is to supply high-energy, high-protein complete compound feed from small pigs to large pigs. It is characterized by fast growth rate and high feed utilization rate. It is suitable for fattening lean domestic pigs, but not for fattening special wild boars. Now some farms use compound feed to feed special wild boars. Although it increases the growth rate, it reduces the quality of wild boar meat and increases production costs. As a product with game characteristics, special wild boar meat must maintain the unique flavor of wild boar meat to attract consumers. If special wild boars are raised as domestic pigs, they will inevitably lose their market competitiveness.

5. How to improve the efficiency of laying hen farming from the perspective of reproductive science?

You can install electric lighting in the breeding shed to lay two eggs a day.

6. How can we improve the production efficiency of the breeding industry?

Grasping "increasing income and reducing expenditure" is the key to effectively improving the economic benefits of farmers. Specifically, the following points should be grasped:

1. Raise animals scientifically, select superior breeds, use reasonable and practical enclosures and feeding methods, master feeding techniques, and learn management;

2. Strengthen feeding management and do routine work well, such as regular and quantitative feeding, good pen hygiene, regular disinfection, routine immunization and deworming, etc.;

3. Market the animals at the right time and understand the market situation, etc.

7. What are the methods for evaluating the economic benefits of breeding?

Continuously improving and maintaining the economic benefits of the pig farm is the ultimate goal of breeding. The quality of the economic benefits is directly related to the survival and development of the pig farm. As the person in charge of a pig farm, you can scientifically analyze the economic benefits of the pig farm, predict and control the changes in the pig farm market in the near future, correctly analyze the real reasons for the pig farm's profit or loss, make correct decisions, and come up with feasible plans.

At present, the operation of domestic pig farms has been affected by the African swine fever last year, showing an ups and downs. However, the basic factors affecting the economic benefits of pig farms are still certain. Here are several methods of economic benefit analysis. Because there are many factors that affect the economic benefits of pig farms, but the main ones are: management, environment, nutrition, breed, disease and other factors.

The management of the pig farm is the first priority, which includes the management of human feeding activities and the management of pig feeding. Becoming a person who truly understands the management of the pig farm is a prerequisite for running a good pig farm, especially in large-scale pig farms. Only by scientific management can the annual production rate of sows be increased, the survival rate and growth rate of pigs be increased, and the cost of feed consumption be reduced.

Management of the pig farm environment. The pig farm environment is divided into macro-environment and micro-environment. The macro-environment includes the market situation of pig farming and national policies. The micro-environment of the market includes the environment around the pig farm, especially the environmental protection environment, etc. The cost performance of pig feed is an important market factor affecting the economic benefits of the pig farm. People in the industry are accustomed to calling the ratio of the price of live pigs to the price of corn the pig feed price ratio. The profit and loss critical point is 6 to 1. If it is higher than 6:1, the market is profitable, and if it is lower than 6:1, it is loss-making. If the management is good, there may be no loss or less loss.

Feed, pig farming requires the use of scientific feed formulas. Nutrition is the foundation of pig farming, and feed is the key to the pig farming industry, generally accounting for 60% to 80% of the total production cost. How to rationally use feed, reduce feed costs, and scientifically formulate feed plays a vital role in improving the economic benefits of pig farms.

The breed of the pig farm is the key to ensure the economic benefits of the pig farm. On the one hand, a good breed is popular in the market. On the other hand, it has strong disease resistance, fast growth and high market rate. At present, the main breeds used in the market are the three-way pig breeds. At present, they are affected by African swine fever and the market rate is very low.

Pig diseases in my country present complex characteristics, which can be roughly divided into viral diseases, bacterial diseases, parasitic diseases and nutritional metabolic diseases. Of course, the viruses that endanger pig farming in my country mainly include porcine reproductive and respiratory syndrome, swine fever and foot-and-mouth disease. Therefore, it is necessary to strengthen the epidemic prevention measures of pig farms at ordinary times. Through quarantine, even if the positive reaction is detected, there is no need to be afraid. A corresponding eradication plan can be formulated to control the spread and spread of infectious diseases. Strict quarantine should be carried out, and correct and reasonable immunization procedures should be formulated. The use of vaccines should be carried out according to the vaccine instructions, and the dosage and method of use should not be changed at will. To create a safe and comfortable environment for pigs, we must create a safe and comfortable pig farming environment, continuously improve the health level and production performance of the main body, and carry out targeted drug prevention. Although some diseases are not yet prevented by vaccines, they can still be prevented from other methods, especially bacterial infectious diseases. The use of Chinese herbal medicines has good effects, but it must be highly targeted, especially when the environment of the pig farm changes, penicillin, oxytetracycline and local mycin are often used, and the effect of disease prevention is also very good. Of course, antibiotics must not be used indiscriminately because it will threaten human health.

In order to improve the economic benefits of the pig farm, another analytical method can be used - improving the pig production report. Mastering the production statistical method of the pig farm is very important for analyzing the economic benefits of the pig farm. Data is the effect, and it is very important to accumulate data.

In terms of production, we should also pay attention to the following aspects: 1. Timely record and analyze the production performance of sows, and timely eliminate sows with low performance. 2. Pay attention to the prevention and treatment of diseases, and timely isolate commercial pigs or sows with diseases. 3. If the funds are sufficient, purchase automatic feeders to reduce labor costs. 4. Establish information files, reflect the production situation of the pig farm in real time through data, and analyze the situation of the pig farm through the information system.

5. Calculate the cost of the pig farm, pay attention to the price changes in the market, predict the price changes in the next few months, and predict the cost price and market price ratio of the pigs to be slaughtered in the next few months. Determine the production volume and slaughter rate.

8. How to improve the economic benefits of breeding greenhouses?

Using greenhouses to grow off-season vegetables is an important project for our farmers to increase their income. Although the investment is much larger than that of open fields, if the planting is good, the income is far greater than that of open fields. However, if the management is not good, the loss will be greater. How to plant and manage to improve the economic benefits of greenhouses?

First, because greenhouses have the advantage of heat preservation, when choosing vegetable varieties to plant, priority should be given to vegetables that cannot be planted in winter and vegetables that have relatively harsh temperature requirements. At the same time, they are popular vegetables in the market, and they have certain cold resistance and stress resistance in the selection of vegetable varieties. They have high yields, good quality and good economic benefits in greenhouses. At the same time, they are vegetable varieties that cannot be preserved in the open field until they are sold in winter. Off-season planting will achieve good results. For example, vegetables such as cucumbers, eggplants, Chinese toon sprouts, peppers, and some melons.

Second, in order to make full use of the effective space in the greenhouse. Use three-dimensional planting to increase the multiple cropping index. Generally, winter greenhouses mainly supply from New Year's Day and Spring Festival to around May Day of the following year. For the vegetables planted, plant them reasonably densely. For example, cucumbers should be cold-resistant varieties. Use main rows and secondary rows for planting. Increase to about 6,500 plants per mu. When the tenth leaf appears on the secondary row cucumber, remove the top. Leave about 12 leaves on each plant. Each plant has 3-4 cucumbers. When these three or four cucumbers are finished, the secondary row cucumber vines can be pulled out. This method can increase the early yield of cucumbers by about 30%.

3. Reduce the humidity in the greenhouse, reduce the occurrence of pests and diseases, and increase the ground temperature in the greenhouse. Low temperature and high humidity in the greenhouse can easily cause slow growth of seedlings and low disease resistance. Generally, double film covering is adopted. Before planting the seedlings, 3,000 kg of fully decomposed organic fertilizer is applied per mu, and the application of nitrogen fertilizer is appropriately reduced to prevent excessive ammonia in the greenhouse in the future, which will cause harm to the vegetables. After plowing, the fertilizer is mixed with the soil. Cover the whole greenhouse with ground film. If conditions permit, drip irrigation bags can be laid, which can significantly reduce the humidity in the greenhouse and increase the ground temperature in the greenhouse. When preparing the land, add 5 grams of carbendazim per square meter to disinfect the soil. Reduce the occurrence of diseases in the future. For some vegetables, an additional small arch shed can be added, which is more conducive to increasing the ground temperature.

Fourth, no one can accurately control the changes in the market. When choosing vegetable varieties, develop more high-end vegetables and manage vegetables carefully. For ordinary off-season vegetables, try to target market gaps. For the same kind of vegetables, if the weather is good and the temperature is relatively high in winter, the yield of the vegetables will be high and the price will be low. On the contrary, the price will be high and the yield will be low. Therefore, in bad weather, what matters is technology.

5. If you plant cucumbers, you usually use black seed pumpkin grafted seedlings for planting. Black seed pumpkin has relatively good disease resistance and can cope well with the occurrence of greenhouse continuous cropping disease. Generally, in continuous cropping land, the yield of cucumbers is increased by more than 20% compared with those without grafted seedlings. In order to increase the cucumber fruit setting rate, you can spray the leaves with a concentration of 0.2% ethephon solution when the cucumber seedlings are in the second leaf stage, which is conducive to the differentiation of female flowers of cucumbers.

Sixth, apply gas fertilizer. Since the greenhouse is relatively tightly closed and the air flow is relatively poor, the carbon dioxide gas used to make nutrients is obviously not as much as that in the open field. In order to increase the yield of vegetables in the greenhouse, carbon dioxide gas can be added to the greenhouse vegetables. The method of adding gas is generally to use sulfuric acid and ammonium bicarbonate to react chemically at around nine o'clock on a sunny day. When diluting concentrated sulfuric acid, first prepare three parts of water by volume, place the water in an open plastic bucket, and pour one part of concentrated sulfuric acid along the glass rod. Slowly pour it into the water. Do not pour the water directly into the concentrated sulfuric acid. 30-40 plastic buckets of the same type are required per acre. About 50-100 grams of ammonium bicarbonate are placed in each bucket each time. Carbon dioxide gas that can be used by vegetables is produced. It is generally best used during the peak fruit period. Close it for a period of time and ventilate it in time. If a reflective curtain is hung on the back wall of the solar greenhouse, scattered light can be increased, which is conducive to the production of light substances.

7. Selection of greenhouse film. The solar greenhouse generally uses polyvinyl chloride drip-free film. The drip-free film can increase the permeability of light and reduce the obstruction of light caused by water droplets condensation. It can increase the temperature of the greenhouse and reduce the humidity in the greenhouse.

9. 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.

10. 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.