The price and culture method of eel fry

Eel refers to the general name of species under the classification of eel order, also known as white eel, river eel, eel, etc., usually spawn and reproduce in the deep sea, grow up in a freshwater environment, rich in nutrition, delicious, less spiny and succulent, and have the function of cool summer heat, nourishing and strengthening the body, and the breeding value is very high. Let's take a look at the price and breeding methods of eel seedlings.

How much is the eel fry?

The price of eel fry is about 3-5 yuan, but the price varies greatly due to the specification, variety, origin and quantity of eel fry. And eel fry can not be cultivated by artificial reproduction, this is mainly because the eel has a very special life history, it is difficult to simulate in the artificial environment, the production is mainly through natural fishing to obtain larvae. At the same time, the sex of eel is determined by the acquired environment. When the population number is small, the proportion of female fish will increase, while the population number will decrease.

Culture conditions of eel

1. Water source: the plain area is dominated by rivers and lakes, and the mountain areas are dominated by streams and springs. It is best to have groundwater to facilitate the extraction of deep well water. The suitable water quality is pH 7: 8, transparency is more than 20 cm, and there is no harm of industrial sewage.

2. Power supply: the farm needs sufficient power. Generally, each mu of eel pond needs to be equipped with an aerator with 1 kilowatt power. An eel farm with an annual output of 100 tons of edible eel needs at least a 150 KVA transformer, and it is necessary to ensure that there is no power outage all the year round.

3. Others: loam is the best soil for construction, the topography is required to be flat, and the climate is warm. The benefit is more obvious if the thermal drainage or hot spring water of the thermal power plant can be used. In addition, convenient land and water transportation is required to transport feed and commodity eels.

Eel fry are domesticated in separate ponds?

1. First-class pool: the first-class pool is used for eel seedling feeding training and raising eel seedlings to about 0.2 grams. At this stage, there are about 7000,000 eel seedlings per kilogram, with an area of 50 million square meters, a depth of 0.8 million 1.0 meters and a water depth of 0.5 0.6 meters.

2. Secondary pond: the second pond raises eel species weighing 0.2 kilograms. At this stage, there are about 500 million eels per kilogram, covering an area of 200 million square meters, with a depth of 1.2 million 1.5 meters and a water depth of 0.8 million 1.0 meters. Pay attention to the serious weight differentiation at this stage, so the ponds should be divided regularly.

3. The third-level pond: the third-level pond raises eel species weighing 220g. At this stage, there are about 50kg of eel species, covering an area of 40000m2, with a depth of 1.4m and 1.5m, and a water depth of 1.0m and 1.2m.

How to release eel fry?

1. Stocking density: the stocking density of eel fry varies according to different culture methods. Generally, the stocking density is 150kg / m2 in watertight ponds and 500g / sqm in running ponds. Low density stocking is suitable for fast growth and high survival rate.

2. Disinfection of eel seedlings: eel fry have delicate physique and are easy to scratch and infect water mold and bacterial diseases during harvesting, temporary rearing and transportation, so they must be sterilized during stocking, one is to use containers for medicine bath, the other is to sprinkle medicine bath in the whole pool.

3. Fish fry restocking: eel fry can only begin to feed and grow when the water temperature is above 15 ℃. It is more suitable for eel fry to be reared in the open air when the natural water temperature is above 13 ℃. Eel fry can be eaten when the water temperature rises after a short period of temporary rearing.

Culture techniques of eel

1. Water quality environment: the sea area near the estuary where the water surface is open, the water quality is good, the wind speed is low and the water depth can be maintained at low tide is more than 4 meters. It is required that the water temperature range is 8: 30 ℃, the current speed is less than 1 m / s, and the water velocity of 0.5m / s is the best.

2. Cage specifications: 3 × 3 × 3 meters or 6 × 3 × 3 meters unjointed net cages are adopted. The mesh specifications are raised black eel, young eel 0.5 cm, adult eel 0.8 cm. The built-in 1 × 0.5 × 1 meter multi-layer net frame is the rest platform. The cage open has 15 cm anti-escape eaves.

3. Seedling release: young eel is the best, with a density of 150 eels per square meter. if there are no young eels, the density of black eel is 500 eels per square meter. eel seedlings should be sterilized with medicine bath before release to prevent infection.

5. Water quality management: the water quality management of eel culture is particularly important, requiring that the specific gravity of seawater is 1.01-1.02, the dissolved oxygen is more than 5 mg per birth, and the pH value is 7-8.5.

6. feed: "four decisions" should be achieved in feeding eel.

① timing: except for feeding at 8pm every day in early spring and winter, feeding once at 5am and 8pm every other time.

② positioning: feeding on a fixed bait table.

③ quality: feed the full-price formula feed with eel special multi-vitamins.

④ quantity: the total amount of diet is 15% in adult eel stage, 3% in young eel stage, about 5% in black eel stage, and 0.551% in high temperature and overwintering period.

7. Separate boxes in time: after about a month of feeding, the density of eels has greatly increased, and individual differences are also more disparate. Eels must be selected and raised in boxes in time, separated according to physical strength and individual size, and should be operated carefully in the process of screening boxes to avoid scratching the fish.

8. change the cage: in order to keep the cage clean, prevent disease and ensure the smooth exchange of water, the cage should be changed in time, every 10 days in summer and autumn, and every 50 days in early spring and winter. the replaced cages should be cleaned for next use.

9. Daily management: carry out group management on the cage, test the water quality every day, make detailed records of meteorology, water temperature, pH value, bait, prevention and control of diseases, observe the feeding and growth of eels, find problems, and deal with them in time.