CATDOLL : CATDOLL: What are the techniques for breeding fish? What are the quality requirements for farmed fish?

1. 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.

2. 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.

3. 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.

4. 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.

5. 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.

6. Which flat fish are suitable for family breeding?

There are many types of flattened fish, the most typical of which is the sunfish. This fish lives in warm waters. Its head is particularly large, and its body and tail are extremely small, making it look as if the back half of its body has been cut off. Its pectoral fins are very small, while its anal fins and dorsal fins are very long, and from a distance it looks like a "lantern" that children play with.

The skin of the sunfish is rough, and it is said that sharks are reluctant to eat it because of its rough skin. But the tough tissue of the sunfish makes up for its slow movement. Usually, it uses its dorsal and anal fins to paddle in the water, or simply drifts with the current to chase other fish.

The butterfly fish, which lives in tropical coral reefs, has a short and flattened body. Its body color is bright and beautiful, and it moves swiftly and flexibly. It moves freely in the coral reef ecological community, just like a butterfly flying among flowers.

Flat-bodied fish include rays, flounders, plaices, and stingrays that live on the seabed.

They are not very flexible in movement, and rely on their enlarged pectoral fins to move up and down from front to back to propel their bodies forward.

The body of the thorns and true thorns grows into a ball. They can no longer swim and can only float on the sea surface with the tide. Once they encounter danger, they will quickly swell up their bodies and spread their thorns, and even the most vicious enemies will be deterred.

7. What are the morphological characteristics of farmed fish?

Ancient warship

The ancient warship is a very common edible fish in Southeast Asia, its country of origin, but in my country, many fish lovers also raise them as ornamental fish. Since the ancient warship is very common and widely raised in Southeast Asia, fish lovers do not have to worry about their source.

1. Appearance characteristics

The ancient warship is a super strong fish species. And it grows very quickly. It can grow very large in a very short time. So you should be careful not to keep them in a small aquarium. The aquarium should be no less than 120 cm. Otherwise, it will have an adverse effect on their growth.

2. Reproduction characteristics

The reproduction method of the ancient warship is the same as that of the Siamese fighting fish. It also lays eggs in a bubble nest. The male fish is responsible for the protection of the eggs and young fish. The young fish that have just started to swim can immediately eat larger baits such as water lice and silk earthworms due to their large size. It should not be difficult to raise them. The young fish are quite aggressive. At about 2 years old, the ancient warship reaches maturity and can reproduce the next generation. This fish has a certain aggressiveness and is too large. Therefore, it can only be raised with large fish. In the process of raising ancient warships, an albino variety appeared, which is the golden warship. It is also called the fortune-bringing fish. In addition, the scientific community has disclosed two subspecies of the ancient warship: the red-winged warship and the seven-barred warship.

8. What marine fish are suitable for breeding in the north?

Cold-water fish such as rainbow trout, Taimen salmon, and Ussuri whitefish have advantages in breeding in Heilongjiang. Crayfish cannot be bred outdoors under the current temperature conditions in the north. If you have financial strength, you can breed them in a small laboratory and expand the scale when the time is right. Crayfish are mainly grown in Hunan and Hubei. The crayfish in Yuanjiang City, Hunan are good. Maybe there are fewer wild ones now, and they are basically farmed. I wish you success.

9. What large fish can be farmed at high density?

No. Because large fish need more living space and higher water quality requirements, high-density farming will lead to slow growth of fish, susceptibility to diseases, water pollution and other problems. At the same time, the breeding of large fish also requires more bait and more management manpower. If high-density breeding methods are adopted, the cost will be very high. Therefore, high-density breeding methods cannot be used to breed large fish. The breeding of large fish requires sufficient living space and water quality requirements, and requires refined management to ensure the healthy growth of fish. In order to avoid the negative impact of high-density breeding, reasonable breeding density should be adopted, breeding equipment should be upgraded, and management should be optimized to improve breeding efficiency. At the same time, supervision needs to be strengthened to avoid the damage to fish resources caused by illegal breeding activities.

10. What are the common fish farmed in my country?

I only know about the breeding of some common freshwater fish.

The most common species are the four major carps of "grass carp, silver carp and bighead carp". In addition, there are carp, catfish, bream, famous and special fish including yellow catfish, bigmouth catfish, sweet-scented osmanthus fish, whitebait and so on.