CATDOLL : CATDOLL: When raising eels in greenhouses, is the temperature controlled by water temperature or greenhouse temperature?

1. When breeding eels in greenhouses, is the temperature controlled by water temperature or greenhouse temperature?

The temperature of eels raised in greenhouses is controlled by the greenhouse temperature. The most suitable growth temperature for eels is 27-30℃. Plastic greenhouses are used, and no special heating equipment is required. It is easy to maintain this temperature in the greenhouse in spring, summer and autumn. Even in the cold winter, the temperature in the greenhouse can reach an average of 20℃. The water in the breeding pond is kept in a micro-flowing state, and the water quality will not deteriorate.

Farming eels in plastic greenhouses can achieve continuous production all year round, and soilless flowing water farming can effectively control diseases and increase benefits exponentially.

1. Breeding pond construction:

⑴Open breeding ponds are suitable for places with running water all year round. Breeding ponds are built with bricks and cement. Each pond has an area of ​​10-20 square meters, a depth of 40 cm, a width of 1-2 meters, and a bank width of 20-40 cm. Two water inlet pipes and two drainage pipes with a diameter of 3-4 cm are set at the relative positions of the ponds. The water inlet pipe is at the same height as the bank, one drainage pipe is at the same height as the bottom of the pond, and the other is 5 cm higher than the bottom of the pond. Metal mesh is installed at the inlet and drainage pipes to prevent escape. Several breeding ponds are arranged side by side into a unit, and the area of ​​each unit should not exceed 500 square meters.

⑵ Closed circulation filtration breeding pond. Suitable for use in places where there is a lack of water. The construction method of the breeding pond is the same as that of the open breeding pond. In addition, an aeration tank and a sedimentation tank need to be built, and some water purification, pumping and heating equipment need to be added.

2. Greenhouse construction: The construction of a plastic greenhouse is the same as that of an ordinary greenhouse. It is best to place each unit in the same greenhouse for easy management.

3. Stocking of eels: After the pond is built, plug the main drain outlet, fill the pond with water and soak for 5-7 days, then drain the water, then plug the drain pipe level with the bottom of the pond, drain the water to keep a slight flow of water in each pond, and the water depth is 5 cm. Then you can stock the eels. Before stocking the eels, prepare a liquid medicine at a ratio of 8 grams of copper sulfate and 10 grams of bleaching powder per cubic meter of water, stir it thoroughly, and soak the eels in the liquid medicine for 20-30 minutes (water temperature 10-15℃) after the medicine is dissolved. After the eels are disinfected, stock them in time, and stock 4-5 kilograms of eels with a specification of 35-50 per kilogram per square meter. The eels in the same pond should be of the same size.

4. Feeding: 2-3 days after the eels are released, chop up earthworms, snails, clams, frog meat, etc., put them in the feeding table for training, and increase the water flow appropriately. The first feeding amount can be 1-2% of the total weight of the eels. Check the next morning. If they have eaten all, the feeding rate can be increased to 2-3% at the next feeding, and then gradually increase to about 5%. As the eel's appetite increases, silkworm pupae, maggots, cooked animal viscera and blood meal, fish meal, bean cake, rapeseed cake, bran, rice bran, melon peel, etc. can be added to the feed until they are completely fed with artificial feed. The protein content of the feed should be 35-40%. When the eels eat normally, they can be fed once a day at 8-9 am and 2-3 pm.

5. Daily management: When using plastic greenhouses to breed eels, the water quality is fresh and as long as there is enough feed, eels generally will not escape, but care must be taken to prevent damage from natural enemies such as rats and snakes. After a period of breeding, if the eels in the same pond are uneven in size, they should be separated and raised in time. Eels can be put on the market after 5-6 months of breeding, with a size of 6-10 per kilogram, and a survival rate of more than 90%.

2. Can the eels raised in greenhouses be released in April and May?

The eels can be raised in greenhouses and released in April and May.

Eel (scientific name: Monopterus albus) belongs to the order Synbranchidae, family Synbranchidae, genus Monopterus. It is also called yellow eel, silver eel, Luo eel, snake fish, blood eel, Chang fish, [1] long fish (in northern Jiangsu area). It is a general term for about 15 species of slender eel-shaped fish in the order Synbranchidae. There are two species distributed in my country, one is the common yellow eel and the other is the mountain yellow eel, which is distributed in Sichuan, Yunnan, Guizhou, Chongqing, Hunan, Hubei, Anhui, Henan and Guangdong and Guangxi. Eel is commonly known as yellow eel, which belongs to the class of bony fish, order Synbranchidae, family Synbranchidae, subfamily Monopterinae. It is a fish with a body like a snake but without scales. Its skin color is green or yellow. The large ones are two to three feet long. It likes quietness and usually lies quietly at the bottom of the water.

3. Do hibernating eels need to be fed?

In cold seasons, people can go without food for a long time without dying.

Habits:

The eel is a tropical and warm temperate fish. It is a bottom-dwelling fish with strong adaptability and can survive in rivers, lakes, ditches and rice fields. During the day, it likes to burrow in humus-rich mud or live in burrows in rock crevices near water on the embankment. It rarely moves during the day and comes out of its burrows to look for food at night. Its gills are not well developed, but it uses the inner wall of its mouth and throat as an auxiliary organ for breathing, and can breathe air directly; it can survive when the oxygen content in the water is very poor. After leaving the water, as long as the skin is kept moist, it will not die within a few days. The eel is an omnivorous fish that feeds on various small animals. It is greedy and eats most vigorously in summer. It can go without food for a long time in cold seasons without dying.

4. Are eel fry in March suitable for greenhouse farming?

Conventional pond farming is prone to disease and the hibernation of eels affects year-round farming. Using plastic greenhouses to farm eels allows for continuous production all year round. Soilless and flowing water farming can effectively control diseases and increase benefits exponentially.

The most suitable growth temperature for eels is 27℃～30℃. With plastic greenhouses, there is no need for special heating equipment, and the temperature in the greenhouse can be easily maintained at this temperature in spring, summer and autumn. Even in the cold winter, the average temperature in the greenhouse can reach 20℃.

Keep the water in the breeding pond slightly flowing so that the water quality will not deteriorate.

There are two main ways to cultivate soilless water in plastic greenhouses:

(1) Open. Suitable for building ponds in places with warm water all year round. The advantage is that the flow is stable and suitable for large-scale operations. The breeding pond is made of bricks and cement. The area of ​​each pond is 10 to 20 square meters, the depth of the pond is 40 cm, the width is 1 to 2 meters, and the width of the pond bank is 20 to 40 cm. Two water inlet pipes and two drainage pipes with a diameter of 3 to 4 cm are installed at opposite positions of the pond. The water inlet pipe is at the same height as the bottom of the pond; one drainage pipe is at the same height as the bottom of the pond, and the other is 5 cm higher than the bottom of the pond. Metal mesh is installed at the inlet and drainage pipe openings to prevent escape. Arrange several breeding ponds side by side to form a unit. The area of ​​each unit should not exceed 500 square meters.

(2) Closed loop filtration type. Suitable for use in large cities or places where water is scarce. Its advantages are that the water used for breeding can be reused, the water consumption is low, and the temperature is easy to control, but the investment is slightly larger. The construction method of the breeding pond is the same as that of the open one. In addition, an aeration tank and a sedimentation tank need to be built, and some water purification equipment, pumping equipment and heating equipment need to be added.

The construction of a plastic greenhouse is the same as that of an ordinary greenhouse. It is best to place each unit in the same greenhouse for easy management.

The breeding method of plastic greenhouse soilless water flow breeding is adopted. As long as there is enough feed, the eels will generally not escape due to the clear water quality. However, it is necessary to prevent natural enemies such as rats and snakes from harming. After a period of breeding, the eels in the same pond will be uneven in size and should be separated and raised in time.