CATDOLL : CATDOLL: I want to raise yellow croaker. What experience do you have in raising yellow croaker?

I want to raise yellow croaker. What experience do you have in raising yellow croaker?

As a marine fish, yellow croaker was previously caught in the wild. However, with the increase in fishing volume, wild yellow croaker resources have been destroyed, so people began to try to artificially breed yellow croaker. Artificial breeding of yellow croaker is very difficult, and the most important method is to use cage breeding. The purchased fish species must be carefully selected before entering the cage, and fish with uniform size, strong and lively, and complete scales must be selected. In addition, they must be disinfected to avoid carrying germs and parasites. So today let us take a look at what experience is there in breeding yellow croaker in a shed?

1. Culture Preparation

Since yellow croaker is difficult to raise, sufficient preparations need to be made before breeding. If cage breeding is adopted, the cage should be arranged according to the specifications of yellow croaker. Usually, the water depth in the cage is about four meters. Secondly, in order to avoid abrasions on yellow croaker, it is best to use cages with softer materials for breeding. If pond breeding is adopted, it is necessary to choose a place close to the water source and disinfect the pond. The water god can be kept at about two meters. Finally, oxygen supply equipment and water quality regulating equipment need to be prepared. After everything is prepared, breeding can be officially started.

2. Breeding pond

The average water depth of the pond should be more than 3m, and the deeper the better. The water exchange conditions should be good. In the 15 days of each tide, the water should be exchanged for more than 12 days. The pond size should be about 15 mu. The pond should be strictly desilted and disinfected before stocking fish. In order to prevent the water level from dropping due to pond leakage, or the water quality from deteriorating due to the inability to change water during the flood season, pumping equipment of corresponding size and power should be equipped. The breeding pond is best located in a place with fresh water source so as to prevent leakage and adjust the water quality.

3. Environmental management

The environment around the wintering site should be kept quiet to avoid noise interference. Do not stir the pool water at will, and be careful when checking and operating to prevent the wintering fish from being frightened and running around, wasting energy, increasing oxygen consumption, scratching the skin, and contracting diseases. Due to the heating and insulation effect of the plastic greenhouse, although the temperature outside the greenhouse is sometimes very low, the water temperature in the greenhouse is basically above 10℃ throughout the wintering period, and can reach 20℃ at the highest. The yellow croaker eats normally and grows slightly during the wintering period.

These experiences are that you need to know the growth cycle of yellow croaker and the reproduction cycle of yellow-banded flower-carrying croaker. To create a better breeding environment, you also need better water quality and better breeding methods.

We must pay attention to the water temperature for breeding, the surrounding temperature, the spaciousness of the space, the clarity and cleanliness of the water source, the climate, and daily light.

To choose the right species for breeding, you must pay attention to the water shortage, cleanliness and hygiene, oxygen content, disinfection, and the ratio of feed is also very important.

Before breeding, you must make adequate preparations and arrange the cages according to the standards of yellow croaker. The water depth should be about 4 meters. The pond should be disinfected regularly and kept close to the water source.

What should we pay attention to during the artificial breeding of yellow croaker in cages?

Characteristics of large yellow croaker

Large yellow croaker is a warm-blooded, swarming migratory fish. Its adaptable temperature range is 10℃～32℃, its optimum growth temperature is 18℃～25℃, its salinity range is 24.8～34.5, its optimum salinity is 30.5, its pH value is 7.85～8.35, and its dissolved oxygen is generally above 7 mg/L. However, in artificial breeding, its dissolved oxygen can be below 6.5 mg/L, and its minimum cannot be lower than 2 mg/L. Large yellow croaker is a carnivorous, omnivorous fish, and is one of the main economic fish species in my country. In recent years, due to the decline of resources, the output has been far from meeting the needs of consumers. Therefore, in order to vigorously develop new species of fish breeding, after on-site investigation and demonstration, we have carried out cage artificial breeding in the Jiaozhou Bay waters, and achieved good economic benefits. The breeding techniques adopted are summarized as follows

Sea area selection

The sea area for artificial breeding of large yellow croaker in net cages is selected in Jiaozhou Bay, where the water is fertile, the high-quality biological population is thriving, the salinity is suitable, and the salinity is almost vertically uniform throughout the year, with the annual average minimum value of about 31.6. The annual average water temperature is 12℃, 25℃～27.3℃ in summer, the surface water temperature of the sea area is between 9℃～27℃, the temperature difference between the surface and bottom layers is less than 0.5℃～1℃, the flow rate is 0.3m～0.5m/sec, the water depth at the lowest tide in the breeding area is more than 10m, and the highest is more than 15m, the transparency is 50cm～120cm, and the dissolved oxygen is generally 7.1mg～8.0mg/L, which is a very suitable sea area for artificial breeding of large yellow croaker in net cages.

Cage settings and specifications

The requirements for the cage setting in the growing stage of large yellow croaker are basically the same as those in the fish breeding stage, except that the specifications of the cage and the mesh size should change as the fish grow. The cage is made of materials such as polyethylene, and a nylon screen of 40 to 12 mesh can be selected, with a mesh size of about 30 mm. To avoid scratches on the fish body, the net material used should be relatively soft and free of nodules. The depth of the cage is generally 3.5 meters to 4.5 meters, and the water depth in the sea area reaches more than 8 meters at low tide. The specifications of the cage are 4 meters × 4 meters, 3 meters × 3 meters, etc.

Fingerling stocking

The fish species should be well-proportioned, strong, with perfect scales, free of disease and injury, and roughly the same size. It is best to have an average weight of 80 to 100 grams per fish. The large yellow croaker fry are transported in closed water tanks and buckets, and aerated for 24 hours by live water boats. Feeding should be stopped before transportation, and excess mucus should be removed during transportation. The fish species are transported from the south to Qingdao Port by boat, and then transported to the cage breeding site by small motor boats filled with water and oxygenated. Due to the short distance, the survival rate during transportation reaches 100%. The seedlings were released on May 20, and the water temperature was 18.5℃. After the fish species were transported back, we used antibiotics and formalin solution to soak and disinfect them, and then moved them to cage breeding. A total of more than 4,000 fish species were transported in, and the stocking density was about 25 to 30 per square meter.

Feeding

During the cultivation period, yellow croakers are generally fed once in the morning and evening, but they can be fed every other day in rainy weather. The daily feeding amount is mainly determined by the fish's feeding situation, weather, water color, tidal changes, etc. When the water temperature is above 29℃, the daily feeding rate of wet bait is about 6% to 8%. Yellow croakers are mainly fed with fresh bait, miscellaneous fish, miscellaneous shrimps, clam meat, etc. Each fish needs 2.5 catties of bait to be cultivated, and the cost is about 3 yuan per fish.

Management and operation during the growth period

The management and operation of the large yellow croaker cage culture period is the same as that of the fish seed cultivation stage, but the fastest growth in the culture stage is during the high temperature period, when the cages are most likely to be infected with plants and animals. The cages should be changed and cleaned frequently, generally every 15 days or so. Each time the cages are changed and cleaned, the fish in the cages should be soaked and disinfected with antibiotic solutions to reduce the occurrence of fish diseases. The dynamics of the fish should be checked three times a day, morning, noon and evening, and the tides, water flow, water quality and fertility should be observed and understood at any time to prevent death due to lack of oxygen, and problems should be solved and handled in a timely manner when they are found.

When breeding yellow croaker in cages, it is important to note that the cage depth should be between 3.5 and 4 meters, the mesh size should not be larger than 60 mm, and the water temperature should also be kept in mind.

The management and operation of the large yellow croaker cage culture period is the same as that of the fingerling culture period, but the fastest growth period is the high temperature period. At this time, the cages are most likely to be attached to animals and plants, so the cages should be changed frequently, generally every 15 days or so. Every time the cages are changed, the fish in the cages should be soaked and disinfected with antibiotic solution to reduce the occurrence of fish diseases.

The requirements for the cage setting in the grow-out stage of large yellow croaker are basically the same as those in the fish breeding stage, except that the specifications of the cage and the mesh size change as the fish grow. The depth of the grow-out cage is generally between 3.5 meters and 4.0 meters, and the mesh size is between 20 mm and 60 mm. In order to avoid scratches on the fish body, it is better to choose a softer texture nodular mesh as the net material.