CATDOLL : CATDOLL: How to farm cold water fish

How to farm cold water fish

Breeding methods of cold-water fish. As we all know, cold-water fish is a type of fish. It has a history of nearly 100 million years. Cold-water fish are called "living fossils in water". So do you know how to breed cold-water fish? Let me tell you how to breed cold-water fish!

How to breed cold water fish 1 1. Choose a good water source and ensure the appropriate water temperature

The species of cold-water fish farming are salmon and sturgeon. Their original living environment is mountain streams and rivers. The natural waters have good water quality and low water temperature. Therefore, when choosing water sources for cold-water fish farming, spring water and fresh river water should be selected, and the water temperature should be 10℃～18℃. Farms that use river water with higher water temperature as water source can add some groundwater in summer to lower the water temperature.

2. Build a fish pond structure that meets the needs of healthy aquaculture

Cold-water fish breeding ponds are preferably rectangular with rounded corners, no dead corners, and reasonable water flow. Fish can be evenly distributed throughout the pond. The width of the fish pond should be 4 meters and the length should not exceed 15 meters. A layer of fish fence and two layers of gates are set at the drainage outlet of the fish pond. Inverted siphon drainage is used, which is conducive to the discharge of bottom dirt. The water supply of the fish pond should adopt parallel water supply to reduce the chance of cross-infection of fish. The water supply conditions of the fish pond are not good. If the water supply of the fish pond is connected in series, a sedimentation tank should be set below the drainage outlet to reduce the harm of residual bait, fish feces and other metabolites to the fish in the pond below.

3. Implement scientific and reasonable stocking and feeding of cold-water fish. Although the stocking density can be adjusted according to the water exchange rate,

Since the metabolites produced by fish metabolism will increase the hydration indicators such as hydrogen sulfide, ammonia nitrogen, nitrate nitrogen, and nitrite nitrogen in the water, the fish will feel physiological discomfort, slow down their growth, and reduce their ability to resist diseases. Therefore, the stocking of cold-water fish should be kept within the range of 10 kg to 14 kg per cubic meter, which can fully utilize the water and improve the fish's resistance to diseases.

In the process of fish breeding, the nutritional balance and quality of the bait ingredients must be ensured. Attention should be paid to the control of the amount of bait fed. Insufficient feeding will cause hunger, uneven growth of fish, and easy occurrence of parasitic diseases; feeding too much bait will easily cause residual bait pollution, increase oxygen consumption and the chance of various infectious diseases. Feeding must be scientifically and reasonably based on factors such as water temperature, fish body condition, dissolved oxygen, etc. And attention should be paid to the adaptation of the bait particle size to the fish body specifications. Generally, the bait particle size is 2/3 of the mouth of the fish to be fed.

4. Maintain a healthy fish ecological environment to reduce the occurrence of fish diseases

Healthy breeding of cold-water fish is an ecological comprehensive project, and maintaining a good fish ecological environment is an important part of it. Therefore, healthy breeding of cold-water fish requires the improvement and maintenance of the surrounding environmental conditions of the fishing or town pond to reduce the adverse effects of the surrounding environment on the fishery ecology. Pay attention to whether there are fallen leaves and debris flowing into the water inlet at any time, and clean the bottom of the pond regularly (once a week) to prevent the accumulation of waste bait, feces and other dirt and the breeding of algae and bacteria; the bait should be sieved before feeding to sieve out the broken feed powder to reduce the pollution of the water environment and the harm to the fish gills; when the water source is insufficient and the water temperature of the pond is high, oxygenation equipment and groundwater supplementation can be used to increase the dissolved oxygen in the water and reduce the water temperature; for the reused breeding water, UV-C ultraviolet water disinfection and sterilization equipment can be installed at the water inlet of the fish pond to reduce the total number of microbial flora in the water and avoid cross-infection of fish diseases.

5. Increase fish nutrition and improve fish resistance to disease

Healthy breeding of cold-water fish increases the nutrition of the fish body on the basis of ensuring the nutritional balance and quality of the bait, which can improve the fish's resistance to disease. Therefore, feeding an appropriate amount of nutritious bait is one of the necessary means of healthy breeding.

① Feeding inorganic salt nutritious bait Dissolve 250 grams of inorganic salt in water and mix with 50 kilograms of bait, and feed it to fish species and adult fish that have been transported over long distances and have body surface injuries. It can adjust the osmotic pressure of the fish body to make the movement and storage of body fluids normal, promote the growth of skin and mucous membranes, and accelerate wound healing.

② Feeding VC and honey nutritious bait: Dissolve 10 grams of VC in water and mix it with 1 kilogram of honey and mix it with 100 kilograms of bait. Feed it once every 10 days. It can increase the fish's utilization of protein and fat and promote growth and bone development.

③ Feeding Ve and edible oil nutritious bait will

Mix 5 grams of Ve with 1 kg of oil and mix it with 100 kg of bait and feed it once a week. It can increase the fish's utilization of protein and fat and enhance the fish's anti-anemia function.

6. Carry out inspection and quarantine of new varieties

When introducing new varieties, we must fully understand the cross-regional risks of new varieties, require on-site inspections of the new varieties, introduce them from disease-free areas, and strictly quarantine them as required, and supervise them in accordance with relevant regulations after introduction.

In addition to implementing strict quarantine and re-inspection when purchasing seedlings, adult fish farming companies should follow the principle of purchasing seedlings from the same site to avoid cross-infection of fish diseases carried by the seedlings.

7. Use the correct method of applying pesticides to prevent and treat fish diseases

In addition to the right medicine and accurate dosage, the correct method of applying medicine is extremely important for the healthy breeding of cold-water fish in the prevention and treatment of fish diseases. The medicines used for the prevention and treatment of fish diseases are divided into two categories: external medicine and internal medicine. The external medicine application methods include dipping, soaking and soaking, and the internal medicine application method is feeding the bait.

The medicine used for dipping is highly irritating and has a high concentration, generally (20-50)×10E-6, to treat body surface injuries, bacterial and parasitic diseases. It is suitable for fish species with small sizes or that have been transported over long distances, and requires the fish to be put into the medicine solution and taken out immediately. For example: use 50×10E-6 iodine tincture to disinfect fish species.

The drugs used for immersion are somewhat irritating and have a high concentration, generally (10-15)×10E-6, to treat parasitic diseases and prevent bacterial diseases. It is suitable for the operation of dividing ponds in aquaculture, and requires that the fish in the divided ponds be placed in the drug solution for about 10 minutes and then fished out.

The drugs used for soaking are maintained for a relatively long time under certain concentration conditions, generally for about one hour at a concentration below 5×10E-6, to treat bacterial diseases, stubborn parasites and viral diseases. It is required to appropriately reduce the water exchange volume and water level, evenly sprinkle the wine liquid at the water inlet above the fish pond, and then use a drip tube to quantitatively add the agent slowly to the water inlet to maintain the concentration of the liquid in the pond for a period of time. For example: use 2×10E-6 of benzalkonium disinfectant to treat bacterial gill rot.

The drugs used in feeding medicated baits include Chinese herbal medicines, antibiotics, iodine preparations, etc.

How to breed cold-water fish 2 What are the ornamental species of cold-water fish?

1. Pearl scale goldfish

Pearl scale goldfish is a rare mutation. Its scales are hemispherical. If there are sharp objects such as rockery in the aquarium, the scales will easily fall off due to friction. Although they will regenerate, they will not be as beautiful as before. At present, the common varieties are red pearl scale, grass green pearl scale, five-color pearl scale, and crown pearl fish.

2. Eastern Bream

The Oriental bream is native to Europe, so it is also called the European bream. It grows fast, has a varied diet, is cold-resistant, salt-resistant, alkali-resistant, and resistant to hypoxia, and is extremely suitable for the aquatic environment in northern my country.

3. Herring

Guanbei herring is a small freshwater ornamental fish bred by artificial selection, hybridization and purification of wild herrings. It has a variety of species and is easy to feed and breed. It is omnivorous, mild in nature, likes to swim in groups, and is easy to raise.

How to raise cold water fish

The water temperature for cold-water fish should not be higher than 20 degrees. The fish tank (pond) should preferably have temperature control equipment, and the fish tank (pond) should have good excretion capacity. When feeding, it should be determined according to the size and number of fish. Feeding too much food will cause the fish to not finish eating, which will easily deteriorate the water quality. In addition, the fish tank (pond) should be cleaned and disinfected regularly.