CATDOLL : CATDOLL: Eels are fish, similar to snakes but without scales. What are their living habits?

1. Eel is a fish, similar to a snake but without scales. What are its living habits?

Eels are warm-water fish, which means they are not resistant to high temperatures and can only survive in water temperatures between 3 and 38 degrees Celsius. The most suitable water temperature for eels is between 10 and 30 degrees Celsius, and the most suitable water temperature for eels is between 22 and 28 degrees Celsius. When the water temperature exceeds 10 degrees Celsius, eels will start to prey, but when the water temperature exceeds 29 degrees Celsius, the amount of prey they prey on will decrease. If the water temperature is below 5 degrees Celsius, the eels will enter hibernation. One thing to note is that if the water temperature exceeds 38 degrees Celsius, it is very likely that the eels will die.

Eels can breathe through their skin, so they are very resistant to low dissolved oxygen. If you want to raise eels in a pond, the dissolved oxygen level in the water must be above 5.0. If you want to raise eels indoors, the dissolved oxygen level in the water must be higher, generally above 7.0.

Eel is actually a kind of euryhaline fish, which means that this fish can grow in fresh water with a salinity of 0, but can also grow in salt water with a salt content of 1.2% to 18%. Eels generally have relatively high requirements for the ammonia nitrogen content in the water, so if eels are raised artificially, sewage treatment must be done well. Eels prefer to live in groups. If they are in a breeding environment, these fish like to crowd in groups in pipes or on feeding tables. Eel fry are usually nocturnal. They hide under the water during the day, but come out together to find food at night.

Eels have certain requirements for living conditions. They prefer clean water. If they live in waters with poor water quality, they will basically not be seen. Most eels like to lay eggs in unpolluted waters. If they live in fresh water, they usually eat some, such as small fish and shrimps, and some rotten animals.

They particularly like to live at the junction of fresh water and salt water. The river water must be very clean. They are very timid and afraid of light, and usually live at the bottom of the water.

The water temperature suitable for eels to grow is 22~28℃. When the water temperature is above 10℃, eels will start to prey, but when the water temperature exceeds 29℃, the amount of prey will decrease. If the water temperature is below 5℃, the eels will enter hibernation.

It likes to live in warm water and will hibernate if the water temperature drops below 5°.

2. How to keep river eels at home

Prepare containers: Prepare a suitable fish tank for raising eels at home, and add an appropriate amount of water after disinfection. Adjust water quality: The water temperature should be controlled at around 8-38 degrees. Feed: The feeding time is 8 o'clock in the evening, and the feed should be earthworms, snail meat, etc. Note: Observe the growth of eels and the amount of food they eat, and do a good job of preventing diseases in advance.

How to farm eels at home 1. Prepare the container

To raise river eels at home, you must first prepare a container of appropriate size, disinfect it thoroughly, and then inject an appropriate amount of water. River eels usually live in the sea area where fresh and salt water meet, so the water for breeding should be carefully prepared light salt water, and tap water cannot be used directly.

2. Adjust water quality

River eels have high requirements for water quality. The water temperature must be controlled at around 8-38 degrees, and the pH value in the water must be controlled at 6.0-9.0. At the same time, oxygen must be added to the water. When there is a lack of oxygen, the organic matter in the water will produce a large amount of toxic gases, which will cause great harm to the eels.

3. Feeding

River eel is an animal that likes darkness and is afraid of light. The best feeding time is around 5 o'clock in the morning and 8 o'clock in the evening. The feed can be earthworms, snail meat, small fish, shrimps, etc. Adding some antibiotics in appropriate amounts can improve the resistance of river eels.

4. Notes

Farming eels requires testing of the water used for farming to avoid sudden changes in climate, water temperature, etc., which may have a negative impact on the growth of eels. The second thing is to observe the growth of the eels and their daily food intake. If it is different from usual, preparations must be made to prevent diseases.

3. Is it easy to raise eels? How to raise eels at home, in deep water or shallow water?

Easy to raise! 1

Shallow water! 2

Rotten things!

Raising it at home requires decaying matter, so the smell is stronger...

4. Is the eel a marine fish or a freshwater fish? Can it survive in fresh water?

Eels have the characteristic of migration. Sometimes they live in seawater and sometimes in freshwater. Therefore, they are quite special. They can be said to be both marine fish and freshwater fish. When eels are still relatively young, they live in rivers, lakes and other freshwaters. When they reach a certain age and their bodies mature and need to reproduce, they will go to the ocean to reproduce. This is their migratory habit.

1. Is eel a marine fish or a freshwater fish? Eel is a kind of fish. If we classify fish based on their living environment, they can be divided into marine fish and freshwater fish. The difference between marine fish and freshwater fish is quite large, and their living environments are very different. But eels are quite special, and they cannot be classified into one of them, because they can be said to be both freshwater fish and marine fish.

Eels first live in fresh water, and their growth and development process is carried out in fresh water such as rivers and lakes on land. When they reach a certain age, they will go to the ocean to reproduce. This habit is what we often call migratory habits. The process of eels spawning is completed in the ocean, and they can only spawn once in their lifetime. This phenomenon is also called catadromous migration.

2. Can eels live in fresh water? As mentioned above, eels have the characteristics of migration. When eels are still relatively small, they live in fresh water, and they can be seen in rivers and streams. When they reach mature age and need to reproduce, they will go to the ocean to reproduce, and eels can only lay eggs once in their lifetime. It can be seen that eels can live in fresh water. In fact, their growth and development process is carried out in fresh water. In addition, artificially raised eels generally live in fresh water. If they are raised, fresh water can be used, and they will not be unable to adapt.

5. What is the salt-fresh ratio of water used to raise eel fry?

The total alkalinity you mentioned for eels, such as the pH of water used to raise eels, ranges from 6 to 9, with the most suitable range being 7.2 to .8. Eels like to live in clean, unpolluted waters. Eels grow in rivers on land, and migrate to the ocean to lay seeds after maturity. They only lay seeds once in their lifetime and die after laying seeds. This lifestyle is the opposite of the upstream migration of salmon, and is called downstream migration. Its life history is divided into 6 different developmental stages. In order to adapt to different environments, the body shape and body color of different stages have great changes: Seeding stage: located in deep-sea spawning grounds. The sex of eels is determined by the environment. When the population is small, the proportion of female fish will increase, and when the population is large, it will decrease. The overall proportion is conducive to the increase of the population. Eel fry cannot be cultivated by artificial breeding. This is mainly because eels have a very special life history that is difficult to simulate in an artificial environment. Japanese eels grow up in freshwater rivers and begin to migrate to the sea in the summer, that is, they swim from rivers to the ocean to lay eggs, which is the opposite of the upstream migration of trout and salmon, which swim from the ocean back to rivers to lay eggs. Its spawning ground is thousands of kilometers away in the deep sea between the Philippines and the Malay Islands. Scientists discovered this spawning ground mainly because they caught many of its newly hatched fry here. Eels lay eggs and reproduce in the deep sea and grow up in freshwater environments. They are ferocious, greedy, active, dormant during the day and come out at night, have strong phototropism, like running water, and like warmth. Adult eels grow fast, have a round, cone-like appearance, are black and thin, are mostly artificially cultivated, and have tender meat. This fish is common all year round, but it is the most plump and delicious in summer and winter. Eels are rich in nutrition, delicious, have few bones and more meat, and have the effect of cooling and relieving summer heat, nourishing and strengthening the body. Migratory fish are born in freshwater rivers, then enter the ocean, and when they grow up they return to freshwater rivers to spawn. Eels, on the other hand, spawn in seawater. When they are small, they are only the length of a finger and cannot distinguish between sexes, so they flow into the river until they grow to adulthood and can distinguish between sexes. A few years later, they return to the ocean to mate and spawn. Eel Recipe: Grilled Eel with Scallions Ingredients: 1 river eel, 8 scallions Seasonings: Ingredient A: 1 tablespoon each of rice wine and starch 3 tablespoons soy sauce Ingredient B: 1 tablespoon rice wine 2 tablespoons soy sauce 1/2 tablespoon each of sugar and vinegar A little pepper Wash the eel, blanch it in warm water, remove it, cut off the head and tail, cut open the fish belly, remove the large bones, cut it in half, and then cut it into small pieces. Put it in a bowl, add ingredient A and marinate for 20 minutes; wash the scallions, cut them into sections and set aside. Heat 2 tablespoons of oil in a pan, add the eel, fry until both sides are golden brown, and serve. Heat the remaining oil in the pan, sauté the chopped green onions, add the fried eel, add ingredient B and 2 cups of water, bring to a boil over high heat, then simmer until the eel is well seasoned, then turn to high heat and simmer until the sauce is dried up. Ingredients for Crispy Eel with XO Sauce: Ingredients/Seasonings: 300 g eel, 1 egg yolk, 5 g flour, 200 g asparagus, appropriate amount of green pepper, appropriate amount of red pepper, 30 g minced garlic, 5 g cornstarch, 10 cubic centimeters of water, 1/2 teaspoon salt, 1/2 teaspoon sugar, 1 teaspoon rice wine, 2 tablespoons XO sauce, 1/2 teaspoon sugar, 1 teaspoon fresh chicken powder Preparation: (1) Debone the eel and cut it into 8 cm pieces. Cut each piece into 3 slices along the grain, mix well with the ingredients and seasonings, and marinate for about 10 minutes. (2) Remove the coarse fibers from the asparagus and cut into sections. Remove the seeds from the green and red peppers and cut into thick strips. Then blanch all the ingredients in boiling water. (3) Deep-fry the eel in 120°C oil until it turns yellow, remove from the pan and drain the oil for later use. (4) Heat oil in a pan, sauté minced garlic, then add green pepper, red pepper, and asparagus, stir-fry, add eel and seasonings, stir-fry evenly, thicken with cornstarch water, and serve. Ingredients for Avocado Eel Colorful Roll: one kabayaki eel (300 grams), one avocado, some red crab roe, half a burdock, half a carrot, half a yam, and a handful of pea sprouts. Preparation: First, thaw the Japanese kabayaki eel naturally, and cut the eel into 3 to 4 cm long sections for later use. Peel the avocado and cut it into small dices, or blend it into a paste. Peel the burdock and yam, and cut them into thin strips longer than the eel. Soak them in salt water for a while, and cut the carrots and pea sprouts into thin strips of the same length. Boil water in a pot, add carrots and burdock shreds, blanch for 30 seconds and remove. Take some of the various filaments, arrange them neatly, and roll them with eel slices. Finally, cut the Japanese yellow pickled radish into thin strips and tie them tightly. Garnish with avocado and red crab roe. Ingredients for stewing eel with red dates: 1 eel, angelica, astragalus, red dates, and rice wine. Method: First wash the eel, cut it into sections and set aside; then add water to the pot, put all the ingredients and seasonings together, transfer to the pot and stew for 40 to 50 minutes, until the eel is cooked.

1. Water temperature: Changes in water temperature directly affect the metabolism of fish. River eels are warm-water fish, and the water temperature required for their breeding and growth period is 11-33℃, and 25-28℃ is the most suitable. Guangdong, Fujian and Taiwan in my country are the most suitable for eel breeding. 2. pH: Most of the water used in eel farms is taken from natural water. Due to the influence of the geographical environment, the water is acidic or alkaline. For the growth of eels, generally slightly alkaline water has a slightly higher productivity than acidic water. The pH range of water for eel breeding is 6.0-9.0, and the most suitable range is 7.2-8.0. 3. Dissolved oxygen: The maximum dissolved amount of oxygen in water (i.e. saturation) is directly related to water temperature. When the water temperature is low, the dissolved amount of oxygen is large; when there are many phytoplankton in the water, photosynthesis is vigorous or the air on the water surface is smooth, the dissolved oxygen content in the water will also increase. The dissolved oxygen content of water for eel breeding is suitable at 5-12 mg/L. Generally, groundwater has a low dissolved oxygen content and must be aerated before it can be used. 4. Calcium and silicate: When there are fewer calcium ions and more silicate ions in the water, the fish mortality rate is high. When the ratio of silicate to calcium is 1:3.5, it is harmless to fish, so it is more beneficial when there is more calcium and more silicate. 5. Biogas and hydrogen sulfide: These two gases are produced when there is a lack of oxygen in the water and a large amount of organic matter decomposes. These gases are toxic and very harmful to fish. The biogas and hydrogen sulfide content of water used for eel farming must be below 0.1 g/m3. 6. Ammonia: Ammonia is more abundant in surface water. According to Ellis (1944), the ammonia content of water used for eel farming must be below 1.5 g/m3. In addition, Brockway (1950) believed that for every 1 g/m3 increase in ammonia content in water, the oxygen in the blood decreases by 1/7. Therefore, when using groundwater and surface water, you should know its content and use it after aeration. 7. Iron: Surface water generally contains less iron. Groundwater, on the other hand, often contains a higher amount of iron, and it exists in the form of ferrous ions. Once it comes into contact with air, it will react to form trivalent iron precipitation, which not only consumes a lot of oxygen, but is also unsuitable for eel farming. The iron content of water used for eel farming is required to be less than 1 gram/cubic meter, and the most suitable is less than 0.05 grams/cubic meter.

You can feed 5 silver carp or bighead carp. Silver carp and bighead carp like clear water, dislike aquatic plants, and rarely enter waters with aquatic plants. In a pond with a depth of 2 meters, about 500-1000 small fish weighing about 100 grams can be raised per mu (about 1300 cubic meters of water), which is less than 1 fish per cubic meter. Generally, half a catty of fry are raised, and if there is enough grass in the same year, they can grow to more than 3 catties by the end of the year. One mu of fish pond with a depth of 2 meters can raise 600-800 grass carps weighing about half a catty.

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The total alkalinity you mentioned for eels, i.e. the pH of water used for eel farming, ranges from 6 to 9, with the most suitable range being 7.2 to .8. Eels prefer clean, unpolluted waters. Eels grow in rivers on land, and when they mature, they migrate to the ocean to lay their seeds. They only lay seeds once in their lifetime, and then die. This lifestyle is the opposite of the upstream migration of salmon.

Water quality management is particularly important for eel farming, requiring seawater specific gravity to be 1.01-1.02, dissolved oxygen to be above 5 mg per life, and pH to be 7-8.5.