CATDOLL : CATDOLL: Large fish that can be farmed at high density?

1. 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.

2. High-density intensive fish farming technology?

Cage Specifications

Since it is a small cage, its volume should be 1-4 cubic meters. The shape of the cage should be square or rectangular, and polyethylene mesh can be used. The size of the mesh should be determined according to the size of the fish. For example, if the fish is 4.3 cm long when entering the cage, the mesh should be 1-1.1 cm; if the fish is 11.6 cm long, the mesh should be 2.5-3 cm. Setting the mesh in this way is not only conducive to water exchange, but also prevents the fish from escaping.

2. Cage production and placement

In principle, a dense mesh should be used as the bottom to prevent the loss of bait. A black mesh cover should be added 10-15 cm above the water surface to prevent direct sunlight and harassment by fish-eating birds. When placing cages in the water, they should be arranged in a straight line, and the distance between cages should be set to 2-3 meters. The bottom of the cage should be more than 0.5 meters from the bottom of the water.

3. Set up a feeding station or feeding conduit

If floating pellets are used for feeding, a feeding platform that occupies 25% of the cage area must be set up. The feeding platform has no bottom or cover, and is 40 cm underwater and 20 cm above the water surface. If sinking pellets are used, a funnel-shaped feeding conduit with a diameter of 10 cm must be made and fixed in the middle of the cage, with the bottom of the conduit about 30 cm from the bottom of the cage.

3. Choice of cage placement location

Fish farming in small cages can be carried out in rivers, lakes, reservoirs and other waters. In order to prevent eutrophication of water quality, the area of ​​small cages can only account for less than 3% of the total water area, and the cages should be placed in places with stable water levels, slow flow rates, and close to dams or river banks.

3. What should be the reasonable fish stocking density?

The stocking density of fish is mainly related to the fish species and size. Generally, the number of conventional fish species stocked per acre is 600-1200. For larger or faster growing fish, the stocking density can be controlled to be smaller. For smaller and slower growing fish, the initial stocking density can be higher.

4. Fish farming technology?

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.

5. How many species of fish are farmed?

Grass carp, black carp, silver carp, bighead carp, carp, crucian carp, bream, and bighead carp are farmed fish. These eight fish are all carp fish, warm-water fish, with large spawning capacity and strong reproductive capacity. They can spawn naturally, have sufficient seedling sources, strong disease resistance, a long history of artificial breeding, and mature artificial breeding technology. The breeding method is flexible, and can be intensive or extensive, and can be fed with artificial bait or commercial fish feed.

6. 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.

7. Marine fish farming cycle?

The breeding cycle of different species is different. The breeding cycle of blue grouper and oily grouper is about 1 year, while the breeding cycle of eastern grouper and humphead grouper is as long as 2-3 years. Cost analysis: The cost of breeding grouper includes seedlings, feed labor costs, water and electricity costs, management fees, epidemic prevention costs, etc. The breeding cost of one acre of grouper is about 400,000 yuan, and the profit is more than one million yuan, which is very considerable.

8. What is the definition of artificial fish farming?

Fishery farming is also known as aquaculture, which is the artificial breeding of various fish species and seafood to meet market demand. It can be roughly divided into three categories: freshwater farming, saltwater farming and marine farming. Freshwater farming is carried out in inland ponds, lakes and other waters.

Freshwater aquaculture includes fish farming in rice fields, reservoirs, ponds, etc., mainly breeding fish and shrimps, with a high production level, large output and high returns.

Saltwater aquaculture is suitable for breeding some seafood that have special requirements for water quality, such as tilapia, pike, white shrimp, American red fish, carp, etc.

Marine aquaculture utilizes coastal beaches and bays to cultivate fish, shrimp, shellfish, algae, sea cucumbers, etc. It has high yields, short growth cycles, and high economic benefits.

9. How to use fish oxytocin reasonably?

The drugs currently used to induce spawning using dried fish include: the commonly used fish ovulation induction No. 2 (LHRH-A2), fish chorionic gonadotropin (polysexual hormone, HCG), chorionic gonadotropin type A, chorionic gonadotropin type B, fish ovulation induction No. 3 (LHRH-A3), diometron (DOM), fish pituitary gland (pituitary gland, PG) and a variety of complex high-efficiency oxytocin, but the most commonly used ones are fish ovulation induction No. 2 (LHRH-A2) and fish chorionic gonadotropin (polysexual hormone, HCG).

For fish with low spawning rate and low total spawning volume, such as loach, Chinese spiny target (Qingbo) and other medium and high-end fish, dioic acid (DOM) and pituitary gland (PG) should be added on the basis of using LHRH-A2+HCG, and the effect will be doubled.

For common fish, such as grass carp, silver carp, bighead carp, carp, crucian carp, etc., LHRH-A2+HCG is effective, and there is no need to add other oxytocin drugs to reduce production costs. Grass carp using LHRH-A2 alone, silver carp using chorionic gonadotropin type A alone, and bighead carp using chorionic gonadotropin type B alone are sufficient to achieve the purpose of smooth spawning. Also refer to: Rational use of fish oxytocin

10. What is the reasonable density of shallots?

According to the purpose of cultivation and the characteristics of the variety, flat bed cultivation is adopted. Generally, the spacing of 7 plants per bed is: 6-8cm in March-July, and appropriately relaxed to 8-10cm during the high temperature period from August to September. In October, the planting depth should be kept to the point where the top buds of the onions are exposed. Seed quantity: It should be determined according to the different water content of the onions, and the sowing period is divided into early, middle and late. For example, the seed quantity required in the early stage of Gulei (late March to April) is 325-350kg, and about 200kg in the middle stage (May-July). Yunnan shallot 1 Liuhe shallot is about 100kg.