CATDOLL : CATDOLL: What are the main marine farmed fish species in my country?

1. What are the main marine farmed fish in my country?

There are more than 2,200 species of marine fish in my country, of which at least 90 species from 30 families are farmed. The main farmed species include sea bass, grouper, red fish, cobia, crucian carp, sea bream, yellow croaker, pufferfish, and flatfish.

2. 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.

3. What are the farmed fishes in Rongcheng?

Rongcheng's sea is located at the intersection of cold and warm currents, and is recognized by the world as the most suitable latitude for the growth of marine life. Rongcheng's marine aquaculture started in the 1950s, grew in the 1970s, developed in the 1990s, and took off in the early 21st century. It has experienced five industrial waves of "fish, shrimp, shellfish, algae, and ginseng".

4. What is the difference between pure seawater aquaculture and sea crystal aquaculture?

There is basically no difference.

5. 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.

6. What impact does whitebait farming have on other fish?

If silverfish are mixed with other fish, it is very likely that the fish will float to the surface. Floating will also occur when the water temperature is above 20 degrees, which indicates that the dissolved oxygen content in the water is very low.

If you do not take immediate measures after discovering this situation, it will easily cause losses to silverfish and even large-scale deaths.

7. What are the dissolved oxygen requirements for farmed fish?

Dissolved oxygen is a necessary condition for fish survival, and the amount of dissolved oxygen in water has a great impact on fish feed utilization and growth.

When the dissolved oxygen content is above 5 mg/L, fish feed normally; when the dissolved oxygen content drops to 4 mg/L, fish feed decreases by 13%; when the dissolved oxygen content drops to 2 mg/L, its feed decreases by 54%; when it drops to below 1 mg/L, the fish stop eating.

Not only that, sufficient dissolved oxygen in the pond can also improve the living environment of fish and reduce the concentration of toxic substances such as ammonia nitrogen, nitrite nitrogen and hydrogen sulfide.

However, the higher the dissolved oxygen content in the water is not necessarily better. When the supersaturation of dissolved oxygen in the pond water reaches over 150% and the dissolved oxygen content reaches over 14.4 mg/L, it is easy to cause bubble disease in fish.

Appropriate dissolved oxygen levels are crucial for the survival, growth and feed utilization of farmed fish.

The dissolved oxygen in pond water is mainly produced by photosynthesis of phytoplankton in the water. 60% to 70% of the dissolved oxygen in pond water is produced by photosynthesis of phytoplankton.

To this end, in order to keep a certain amount of oxygen in the pool water from escaping into the atmosphere, the aerator can be turned on from 13:00 to 14:00 on sunny days when photosynthesis is strong, so as to send the dissolved oxygen in the upper layer to the bottom layer to supplement the lack of oxygen in the bottom layer and improve the water quality conditions in the bottom layer.

8. What are the methods of marine aquaculture?

At present, fish are raised in ponds and cages.

Rope culture usually consists of seaweed or shellfish.

The seedlings put into the sea are usually parasitic non-swimming animals such as (marine life, sea urchins)

9. What is good about marine aquaculture?

The advantages of marine aquaculture are: focusing on the development of certain fish, shrimp, shellfish and echinoderms (such as sea cucumbers) with high economic value, short production cycle and high output per unit area. According to the aquaculture objects, it is divided into marine aquaculture of fish, shrimp, shellfish, algae and marine treasures, among which shellfish and algae marine aquaculture are developing rapidly; shrimp, fish and marine treasures aquaculture are relatively weak. According to spatial distribution, it is divided into ponds, sea beaches, harbors and shallow seas. According to the degree of intensiveness, it is divided into extensive aquaculture (including care and management), semi-intensive aquaculture and intensive aquaculture, with extensive aquaculture as the main type.

10. What are the poisonous freshwater and marine fish?

Snakehead fish, also known as black snakehead fish. Class Pisces, Cyprinidae. It is a freshwater fish that is commonly bred in rivers and ponds in Cixi City. The body is elongated and cylindrical, and can reach more than 50 cm in length. It is bluish-brown with three longitudinal black spots, and two black longitudinal stripes from the eyes to the gill openings. It has a large mouth, sharp teeth, and the dorsal and anal fins are both elongated like mountain peaks. There is a wide suprabranchial cavity above the pharynx for breathing air. It is ferocious in nature, and the young fish feed on copepods and cladocerans and live on the bottom of freshwater. The young fish feed on aquatic insects, shrimps and other small fish. When it grows to more than 8 cm, it preys on other fish, so it is one of the harmful fish in the freshwater aquaculture industry. The aquaculture industry in Cixi City generally adopts the measures of separate breeding or small breeding. Snakehead fish has plump meat and can be eaten.