CATDOLL : CATDOLL: Can eels be raised indoors?

Can eels be raised indoors?

Eels can be raised indoors, but not for long periods of time.

Eels prefer dark places to grow and do not like to grow in a lighted environment, so feeding should be based on this characteristic. The feeding time is suitable at 5 am and 8 pm. Normally, they need to be fed twice a day, but it is cold in winter and the water temperature will drop, so the eel's food intake will decrease. At this time, only one feeding per day is needed, and the feeding time is set in the evening. The amount of feed to be fed should be determined according to the size of the eel and other factors. The time of each feeding should be unified and the feeding location should be fixed. If the time and location are not fixed, the eel will not be able to find food, which will affect its growth. Finally, pay attention to the quality of the feed, and do not feed with problematic feed.

This is all I have to say about the methods of eel farming. During the farming process, you should always observe the growth of the eels, as well as issues such as temperature, weather, and water quality. If you discover any problems, you should deal with them in a timely manner so that you can better farm them.

Greenhouse water stop

This breeding method is matched with open-air ponds. A steel frame is built above the breeding pond, covered with plastic tiles or films, and heating measures are taken to keep the pond water at around 25°C. The specifications and stocking density of eel ponds at all levels, as well as the feeding and management methods are basically the same as those of open-air pond breeding. The eel fry can be divided into ponds after about one month of breeding, and the survival rate is about 80%. The eel fry released in late February can be raised for 120 to 150 days and can grow into eel seeds of 3 to 5 grams. By the end of the year, they can grow into eel seeds of about 50 grams, and 20 to 30% of the eel seeds can be grown into edible eels for the market.

Open-air water-stopping

Open-air water-stopping aquaculture is the main aquaculture method in China. The scale of the eel farm is preferably 50 mu. The aquaculture facilities mainly include eel ponds, injection and drainage systems and ancillary facilities. Rivers, lakes, reservoirs and groundwater are used as water sources. Generally, only 1/10 to 1/7 of the pond water is exchanged every day. It mainly relies on floating blue algae and water wheels or aerators to increase oxygen to improve water quality. Its advantages are low pond construction costs and low power consumption. The disadvantage is low yield, generally only 1,000 to 2,000 kilograms per mu.

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Eel fry cannot be bred artificially, mainly because the growth habits of eels are very special and difficult to simulate in an artificial environment. For example, Japanese eels grow up in freshwater rivers and begin to migrate to the sea in the summer, that is, swim from rivers to the ocean to lay eggs, which is exactly the opposite of the upstream migration of trout and salmon from the ocean back to the river to lay eggs. Its spawning ground is thousands of kilometers away in the deep sea between the Philippines and the Malay Islands.

Selected list of indoor farming of eels

Indoor eel farming

Finally, we must also comprehensively consider factors such as soil quality, topography, climate, transportation, power supply, seedling resources and living conditions to better design the eel breeding tasks, production scale, breeding methods and long-term development plans.

Eel farming technology

The most suitable growth period for eels is that the eel fry are cultured in a greenhouse constant temperature room equipped with a boiler and a temperature of 28°C in the early stage. The water temperature is constant in early June.

White eel farming technology. How to increase the success rate?

Eel feed was fed once a day, with the feeding amount being 1-2% of the total body weight of the eels.

Which animal is the most valuable to raise in half a farm?

Yes, building a breeding pond indoors is the same as building an outdoor pond. The biggest difference between the two is the temperature. When breeding eels indoors, we must control the indoor temperature. The most suitable temperature is 25 degrees Celsius. The advantages of this breeding method are: the growth cycle of eels will be shortened, and the survival rate of eel fry will be significantly improved.

How to breed sand eels in detail?

1. Open-air water-stopping aquaculture

This is the main breeding method in my country at present. The scale of the sand eel farm should be 50 mu. The breeding facilities mainly include sand eel ponds, injection and drainage systems and ancillary facilities. Rivers, lakes, reservoirs and groundwater are used as water sources. Generally, only 1/10-1/7 of the pond water is exchanged every day. It mainly relies on floating blue algae and water wheels or aerators to increase oxygen to improve water quality. Its advantages are low pond construction costs and low power consumption. The disadvantage is low yield, generally only 1000-2000 kg per mu. 1. Breeding facilities (1) Sand eel pond specifications

Sand eel ponds can be divided into four types: primary ponds, secondary ponds, tertiary ponds and adult sand eel ponds. The proportions of these ponds in the eel farm are 2:8:15:75, that is, for a sand eel farm with a water surface of 50 mu, the primary pond is 1 mu, the secondary pond is 4 mu, the tertiary pond is 7.5 mu, and the adult sand eel pond is 37.5 mu. The uses and specifications of these ponds are as follows.

Level 1 pool: used for feeding training of eel fry and raising eel fry to about 0.2 grams. The area is 50-60 square meters, the pool depth is 0.8-1.0 meters, and the water depth is 0.5-0.6 meters.

Secondary pond: for eels weighing 0.2-2 grams. The area is 200-400 square meters, the pond depth is 1.2-1.5 meters, and the water depth is 0.8-1.0 meters.

Level 3 pond: for eels weighing 2-20 grams. Area 400-800 square meters, pond depth 1.4-1.5 meters, water depth 1.0-1.2 meters.

Growing eel pond: grow eels weighing about 20 grams into edible eels weighing 150-200 grams. The area is 800-1200 square meters, the pond is 1.5-1.6 meters deep, and the water depth is 1.0-1.2 meters. (2) Shape and structure of eel pond

The shape of each level of eel pond is preferably a circle or square with the four corners cut off. According to the characteristics of eels that they are good at escaping, difficult to catch and have high requirements for water quality, the structure must have the functions of anti-escape, easy to catch and convenient injection and drainage. The pool wall is made of block stone, brick mortar, cast-in-place concrete and prefabricated concrete panels. The pool wall is vertical and smooth on all sides, with a wall height of 0.8-1.6 meters. The top of the wall is pressed with a cover plate, which extends 5-10 cm into the pool. The embankment surface should be 0.3-0.5 meters above the water surface. There are two types of pool bottoms: pot bottom shape and flat bottom shape. They are required to be hard and watertight. The bottom is paved with 20 cm thick slag, raked flat and compacted, and then paved with 5 cm yellow sand with tight seams. The first-level pool should also be smeared with cement mortar to facilitate seedling collection. The drainage center of the pot bottom shape is set at the lowest point in the center of the pool bottom. The flat bottom of the low-profile pool is inclined toward the drainage outlet, and the water inlet and drainage outlet are cross-opposed. The water inlet is located on the top of the pool wall, 20-30 cm above the highest water level of the pond, and extends about 30 cm into the pool. The drain outlet is located opposite the water inlet, and there are three gates on the periphery. The first gate is used to prevent escape, and is made of stainless steel mesh or polyethylene silk mesh. The mesh size is 1-1.5 mm for eel fry ponds, 1.5-2 mm for eel seed ponds, and 2-4 mm for adult eel ponds. The second gate or dark box is suspended at the bottom to press out the bottom sewage. The third gate is used to overflow water to keep the water level of the eel pond constant.

Eel ponds have very high requirements for water quality. Not only does each pond require separate injection and drainage systems, but the injection and drainage water sources of the entire eel farm must also be strictly separated. Otherwise, eel feces and the death of a large number of Microcystis will cause self-pollution, leading to serious deaths of eels. (3) Food sheds

Eels like to feed in the shade, so a feeding shed (including a feeding table, feeding area and shade shed) should be set up by the pond in a sunny and leeward place. The feeding table is a rectangular frame of 90×45×20 cm, with a nylon mesh of a mesh size that allows eels to pass freely on the bottom of the frame; the feeding area is set up on the bottom of the water below the feeding table, and is covered with gravel or snail shells, which must be firm and flat; a shade shed is set up above the feeding table. 2. Eel farming (1) Eel breeding

Eel seed cultivation is the process of raising white eels weighing 0.1-0.2 grams to small eels weighing 10-20 grams. In the second year, most eels can be grown into edible eels for sale (150-200 grams per tail). The cultivation of eel fry into eel seeds is generally divided into three levels. The stocking specifications and densities of each level of eel ponds are as follows: 0.1-0.2 grams of eel fry per square meter in the first-level pond, 0.2-0.3 kilograms of eel fry per square meter in the second-level pond, 0.3-2 grams of eel fry per square meter in the second-level pond, and 0.5-2 kilograms of eel seeds weighing 2-20 grams per square meter in the third-level pond.

Selection of eel fry: High-quality eel fry should have a broad head and blunt snout, uniform size, active swimming, no body trauma, smooth jade white body color, plump skin, strong body, and no pathogens. The size is about 6,000 per kilogram.

Stocking of eel fry: Stocking time is March-April, and stocking is more suitable when the water temperature is above 20℃. Before stocking, the breeding pond and eel fry should be disinfected with drugs. The disinfection method of the breeding pond is the same as that of the domestic fish fry pond. The disinfection method of eel fry can be carried out according to Table 7-2. The stocking density is carried out according to the requirements of the first-level pond. Feeding training: Feeding training is the key technology for the success of eel farming, and it takes about one month to train. In the first week after the eel fry is put into the pond, efforts should be made to make the eel fry change from scattered feeding to concentrated feeding. Generally, starting from the evening, use silk earthworms as bait, scatter the clean silk earthworms on the feeding table, feed 4-5 times a day, and the daily feeding amount accounts for 20-40% of the total weight of the eel fry. At the same time, hang a 15W electric light above the feeding table to attract the eel fry to the feeding table and feed in a concentrated manner. You can also build a tent above the feeding table during the day to shade it, creating a dark environment, which also induces the eel fry to feed. If most of the eel fry are led to the feeding table to feed after one week, it indicates that the concentrated feeding training has been successful. Then gradually postpone the feeding time, and finally change it to daytime. Starting from the second week, the feeding amount of silkworms should be gradually reduced, and the minced meat of fresh feed such as clam meat, pig spleen or fresh fish should be increased. Feed 4 times a day, and the daily feeding amount accounts for 10-15% of the total weight of the eel fry. Gradual feeding: During the breeding, the eel fry have different abilities to compete for food, resulting in great differences in individual size. Therefore, eel fry of different sizes should be separated every 20-30 days, and feeding should be stopped for one day before separation. Because the eel fry are still small, they can be caught under the feeding table with a fine-eyed scoop for the first few times of separation, and the strong fry that are on the feeding table first should be separated first;

【Eel farming technology】

1. Open-air water-stopping aquaculture

This is the main breeding method in my country at present. The scale of the eel farm should be 50 mu. The breeding facilities mainly include eel ponds, injection and drainage systems and ancillary facilities. Rivers, lakes, reservoirs and groundwater are used as water sources. Generally, only 1/10-1/7 of the pond water is exchanged every day. It mainly relies on floating blue algae and water wheels or aerators to increase oxygen to improve water quality. Its advantages are low cost of pond construction and low power consumption. The disadvantage is low yield, generally only 1000-2000 kg per mu. 1. Breeding facilities (1) Eel pond specifications

Eel ponds can be divided into four types: primary ponds, secondary ponds, tertiary ponds and eel-growing ponds. The proportions of these ponds in the eel farm are 2:8:15:75, that is, for an eel farm with a water surface of 50 mu, the primary pond is 1 mu, the secondary pond is 4 mu, the tertiary pond is 7.5 mu, and the eel-growing pond is 37.5 mu. The uses and specifications of these ponds are as follows.

Level 1 pool: used for feeding training of eel fry and raising eel fry to about 0.2 grams. The area is 50-60 square meters, the pool depth is 0.8-1.0 meters, and the water depth is 0.5-0.6 meters.

Secondary pond: for eels weighing 0.2-2 grams. The area is 200-400 square meters, the pond depth is 1.2-1.5 meters, and the water depth is 0.8-1.0 meters.

Level 3 pond: for eels weighing 2-20 grams. Area 400-800 square meters, pond depth 1.4-1.5 meters, water depth 1.0-1.2 meters.

Growing eel pond: grow eels weighing about 20 grams into edible eels weighing 150-200 grams. The area is 800-1200 square meters, the pond is 1.5-1.6 meters deep, and the water depth is 1.0-1.2 meters. (2) Shape and structure of eel pond

The shape of each level of eel pond is preferably a circle or square with the four corners cut off. According to the characteristics of eels that they are good at escaping, difficult to catch and have high requirements for water quality, the structure must have the functions of anti-escape, easy to catch and convenient injection and drainage. The pool wall is made of block stone, brick mortar, cast-in-place concrete and prefabricated concrete panels. The pool wall is vertical and smooth on all sides, with a wall height of 0.8-1.6 meters. The top of the wall is pressed with a cover plate, which extends 5-10 cm into the pool. The embankment surface should be 0.3-0.5 meters above the water surface. There are two types of pool bottoms: pot bottom shape and flat bottom shape. They are required to be hard and watertight. The bottom is paved with 20 cm thick slag, raked flat and compacted, and then paved with 5 cm yellow sand with tight seams. The first-level pool should also be smeared with cement mortar to facilitate seedling collection. The drainage center of the pot bottom shape is set at the lowest point in the center of the pool bottom. The flat bottom of the low-profile pool is inclined toward the drainage outlet, and the water inlet and drainage outlet are cross-opposed. The water inlet is located on the top of the pool wall, 20-30 cm above the highest water level of the pond, and extends about 30 cm into the pool. The drain outlet is located opposite the water inlet, and there are three gates on the periphery. The first gate is used to prevent escape, and is made of stainless steel mesh or polyethylene silk mesh. The mesh size is 1-1.5 mm for eel fry ponds, 1.5-2 mm for eel seed ponds, and 2-4 mm for adult eel ponds. The second gate or dark box is suspended at the bottom to press out the bottom sewage. The third gate is used to overflow water to keep the water level of the eel pond constant.

Eel ponds have very high requirements for water quality. Not only does each pond require separate injection and drainage systems, but the injection and drainage water sources of the entire eel farm must also be strictly separated. Otherwise, eel feces and the death of a large number of Microcystis will cause self-pollution, leading to serious deaths of eels. (3) Food sheds

Eels like to feed in the shade, so a feeding shed (including a feeding table, feeding area and shade shed) should be set up by the pond in a sunny and leeward place. The feeding table is a rectangular frame of 90×45×20 cm, with a nylon mesh of a mesh size that allows eels to pass freely on the bottom of the frame; the feeding area is set up on the bottom of the water below the feeding table, and is covered with gravel or snail shells, which must be firm and flat; a shade shed is set up above the feeding table. 2. Eel farming (1) Eel breeding

Eel seed cultivation is the process of raising white eels weighing 0.1-0.2 grams to small eels weighing 10-20 grams. In the second year, most eels can be grown into edible eels for sale (150-200 grams per tail). The cultivation of eel fry into eel seeds is generally divided into three levels. The stocking specifications and densities of each level of eel ponds are as follows: 0.1-0.2 grams of eel fry per square meter in the first-level pond, 0.2-0.3 kilograms of eel fry per square meter in the second-level pond, 0.3-2 grams of eel fry per square meter in the second-level pond, and 0.5-2 kilograms of eel seeds weighing 2-20 grams per square meter in the third-level pond.

Selection of eel fry: High-quality eel fry should have a broad head and blunt snout, uniform size, active swimming, no body trauma, smooth jade white body color, plump skin, strong body, and no pathogens. The size is about 6,000 per kilogram.

Stocking of eel fry: Stocking time is March-April, and stocking is more suitable when the water temperature is above 20℃. Before stocking, the breeding pond and eel fry should be disinfected with drugs. The disinfection method of the breeding pond is the same as that of the domestic fish fry pond. The disinfection method of eel fry can be carried out according to Table 7-2. The stocking density is carried out according to the requirements of the first-level pond. Feeding training: Feeding training is the key technology for the success of eel farming, and it takes about one month to train. In the first week after the eel fry is put into the pond, efforts should be made to make the eel fry change from scattered feeding to concentrated feeding. Generally, starting from the evening, use silk earthworms as bait, scatter the clean silk earthworms on the feeding table, feed 4-5 times a day, and the daily feeding amount accounts for 20-40% of the total weight of the eel fry. At the same time, hang a 15W electric light above the feeding table to attract the eel fry to the feeding table and feed in a concentrated manner. You can also build a tent above the feeding table during the day to shade it, creating a dark environment, which also induces the eel fry to feed. If most of the eel fry are led to the feeding table to feed after one week, it indicates that the concentrated feeding training has been successful. Then gradually postpone the feeding time, and finally change it to daytime. Starting from the second week, the feeding amount of silkworms should be gradually reduced, and the minced meat of fresh feed such as clam meat, pig spleen or fresh fish should be increased. Feed 4 times a day, and the daily feeding amount accounts for 10-15% of the total weight of the eel fry. Gradual feeding: During the breeding, the eel fry have different abilities to compete for food, resulting in great differences in individual size. Therefore, eel fry of different sizes should be separated every 20-30 days, and feeding should be stopped for one day before separation. Because the eel fry are still small, they can be caught under the feeding table with a fine-eyed scoop for the first few times of separation, and the strong fry that are on the feeding table first should be separated first;