CATDOLL : CATDOLL: What is the reason for the early mass mortality of farmed fish?

1. What is the reason for the early mass death of farmed fish?

Hello, I’m Qing Gege. The large-scale early death of farmed fish is a headache for farmers. Let me answer this question below!

When breeding aquatic products, we may occasionally encounter some difficulties, troubles and situations. If there is no one to guide or help, it will be very difficult to solve them. Compared with aquatic products, fish are relatively easy to breed, especially as more and more farmers are breeding fish in rural areas. In the breeding process, no technology is required to achieve good results.

The main reasons for the early mass death of farmed fish are as follows:

1. Explosive mortality caused by viral infection. Some viral diseases do not directly cause large-scale mortality of fish, but after being infected with the virus, the fish's body resistance decreases and they are subsequently infected with bacterial diseases, which can also lead to explosive mortality of fish.

2. Explosive death caused by bacterial infection. The most harmful is the explosive hemorrhagic disease of fish caused by Aeromonas hydrophila, Aeromonas sobria and Yersinia ruckeri. The disease is prevalent from the end of February to November when the water temperature is between 9 and 36 degrees Celsius, and is most serious in the hot season when the water temperature is continuously above 28 degrees Celsius.

3. Explosive death caused by parasites. There are trichodinasis, tricholoma, dactylariasis, trichodinasis, ichthyosis, spore diasis, anchorhead mullet disease, Chinese mullet disease, etc., which usually only cause large-scale deaths in the fry stage of fish, but not in the adult stage. However, when parasites cause secondary bacterial infections, adult fish may also suffer large-scale deaths.

4. If you only feed pellet feed, the nutrition will not be comprehensive. Long-term feeding will cause excessive fat accumulation in the fish's body, damage the liver, and cause fatty degeneration. The fish's immune ability will be greatly reduced, making it easy to develop pathogenic diseases and cause mass deaths.

5. Certain indicators in the water quality environment are seriously exceeded. When they exceed the tolerance range of fish, a large number of fish will die.

6. There are cases of poisoning by pesticides, improper use of disinfectants or insecticides, overdose of drugs, poisoning by ingestion of toxic substances, etc. Usually, fish poisoning has a clear history of exposure to poisons. Some poisons can cause acute poisoning in fish, and the disease progresses rapidly, which can cause mass death of fish.

Do not ignore fish farming, because many details are also critical, that is, the movement of fish species or the change of water color should be paid attention to, and then to manage, can greatly reduce the death of fish. After grasping the key points, the cause of death can basically be analyzed, in order to increase its yield during the farming process.

The above are the reasons and solutions for the early mass death of farmed fish. I hope it can help you! I wish all your farmed fish can grow healthily!

2. 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.

3. 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.

4. Which fish has the largest farm volume?

The fish with the largest farming volume are definitely the four major carps because these fish have a relatively high market demand.

5. What is the cause of the rabbit’s death?

Causes of sudden death:

1. Rabbits need to drink water. All animals need to drink water. The water content in the food they usually feed cannot guarantee the amount rabbits need.

2. If the patient suffers from an acute infectious disease, check whether there is blood in the natural orifices (such as mouth and anus) at the time of death, and whether the hair around the anus is contaminated with feces.

3. Did the rabbit scream or stretch its limbs before dying? If so, it has coccidiosis. It is best to prepare well for rabbits, including cages, water bottles, fodder, rabbit food, coccidiosis vaccine, etc. Rabbits under six months old only need to be fed rabbit food, and those over six months old should be fed with grass and vegetables, but they must all be dry. Rabbits cannot live without water. Young rabbits should be vaccinated with coccidiosis vaccine, otherwise they will die easily. It is best to put a mat under the cage for rabbits, otherwise they will get foot dermatitis if they stand in the cage for a long time. Let them run for about an hour every day.

6. What causes lawn death?

Guo Dunyong replied: 1. Check whether the acidity and alkalinity of the soil will harm the survival of the grass; 2. Check whether the harmful bacteria in the soil will harm the roots of the grass; 3. The grass on the lawn is very delicate, and whether it can withstand the harmful gases in the air; 4. Check whether there is a severe water shortage or drought.

7. 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.

8. 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.

9. Which fish are suitable for freshwater farming in the north?

The following freshwater fish species are suitable for breeding in northern China

1. Carp Carp is one of the common freshwater fish in the north. They are often found in soft mud bottoms and waters with ditches, slopes, branches, rocks and other places where it is easy to hide or forage. Carp is an omnivorous fish and mainly feeds on vegetarian food. Fresh corn kernels and bran can be used as bait. Additives should mainly be fish meal, shrimp meal, silkworm meal, etc. with fishy smell.

2. White Stripe White Stripe is a primary freshwater fish. It has high requirements for water quality and reproduces quickly. This fish is similar in appearance to the horse mouth and the black bass. White Stripe likes fishy food and is a common fish at low altitudes. It likes to live in groups in the upper water layer of streams, lakes and reservoirs, and the depth of its habitat is generally 0 to 10 meters.

3. The scientific name of the Cockroach is Erythroculter ilishaeformis. It is large and slender. It is a large freshwater economic fish in the middle and upper layers. It moves quickly, is good at jumping, has a violent temperament, and is easily frightened. It grows rapidly and is a ferocious carnivorous fish that feeds mainly on live fish. The Cockroach can grow to the size of a meter and is very large.

4. Crucian carp is one of the common freshwater fish in the north. It grows in small rivers with stable water flow and abundant aquatic plants and plankton.

10. What’s the reason for the good quality of fish?

Fish is an important part of people's daily diet. It has high nutritional value and is therefore loved by people. There are many varieties of fish farming in my country, and the farming area is also very large. As we all know, good quality fish sells for a high price, so what factors affect the quality of fish? Today, let's take a look at the four major factors that affect the quality of fish.

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.

fish

2. Feed feeding: select palatable, high-quality, fresh feed according to the physiological characteristics of fish, and strictly follow the four principles 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 use 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.

The above are the four major factors that affect the quality of fish. Different species of fish have different nutrition, taste and market demand. Before breeding, we must consider our actual situation and choose a suitable species. During the breeding process, we must ensure that the feed and water sources are clean and hygienic, and do a good job of disinfection and disease prevention to improve the quality of fish.