Eel culture technology

The secret of raising eels is "there are principles, no laws!" "well, it depends on the accumulation of experience! This is the experience that eel farmers have told us, and it is more necessary to accumulate experience in culture technology. here are the culture techniques summed up by our comprehensive books, eel research experts and farmers' opinions.

I. Culture density

The density of culture varies according to the size of the eel. Usually during the eel line period, because of the need for special care, they are all raised in the same pond to facilitate care, and the stocking density is higher. The bigger the eel is, the lower the culture density will be. For example, to produce 100000 tons per hectare, 83000 eel lines or 60000 eel fry should be stocked. When each eel is 10 grams, the stocking capacity is 3-6 kilograms per square meter. Generally speaking, it is most suitable to put one kilogram per square meter.

II. Water quality management

Eels grow in water, the quality of water is the key to breeding eels; maintaining good water quality can maintain the health of eels in the pond. In terms of water quality management, attention should be paid to:

1. Hydrogen ion concentration: ph represents the acid-base properties of water, the ph value of fish is between 5 and 10, and the water quality with low alkalinity is better than acidity.

two。 Dissolved oxygen: oxygen is an important element for organisms to maintain life. Terrestrial organisms get oxygen from the air, while aquatic organisms rely on dissolved oxygen in water. Eel farmers have oxygen equipment, there are a variety of electric water tankers, the use of water tankers to stir the pool water to supplement oxygen.

3. Discharge: half an hour after the eel eels eat, they will clear the bottom and drain about 10 centimeters deep, and then enter the water to the original water level.

4. Stable water quality: 0.5-2.0ppm potassium permanganate or 10-30ppm formalin can be added.

5. Aquatic plants: an appropriate amount of aquatic plants can absorb nutrients in water, reduce water pollution and help to stabilize water quality.

6. Mixed culture of other fish: some eel farmers will mix with other fish species, on the one hand, it can be used as an indicator of water quality, on the other hand, it can help purify the water quality, but we should pay attention to the competition for food of other fish species, such as brook, black carp, silver carp and grass carp.

Common diseases of eel and their treatment methods

1. How do I know the eel is sick?

When raising eels every day, eel farmers will carefully observe the bait situation of the eels and the appearance of the eels, and if they find that they are sick, they will give them appropriate treatment.

two。 The eel is sick. What should I do?

The eel is sick, but not one by one to feed medicine! Therapeutic drugs are usually mixed into the feed or sprinkled all over the pool. Will these therapeutic drugs accumulate in the eel and cause harm to eaters? Usually these drugs have a certain efficacy period, after the efficacy period, the digestion and metabolism in the eel has been completed, will not cause harm to the human body.

3. Common eel diseases include bacterial diseases and parasitic diseases. Several common diseases and treatments are listed below.

(1) bacterial diseases include vibrio disease, red fin disease, red spot disease, etc. Symptoms include loss of appetite, splenomegaly, Gill and muscle bleeding, fin redness, skin inflammation, systemic punctate bleeding and so on. Treatment methods include changing water, improving water quality, reducing salt concentration in water, removing sick and dead fish, raising water temperature to 26 ℃ ~ 27 ℃, antibiotic treatment and so on.

(2) parasitic diseases include white spot disease, rotifer disease, ring disease, third generation disease, oblique tube disease, nematode disease, etc. Symptoms include loss of appetite, itching, white spots, ulceration, etc. Treatment methods include increasing water temperature and soaking in 0.9-1.5% salt water at 25 ℃.