For aquarium

Lemna for aquarium


Lemna in the aquarium: the benefits and harm

small but very useful aquarium plant

Greetings to all aquarists and regular readers

Today I would like to discuss a simple but very interesting question - question about duckweed in an aquarium: whether it is needed, useful or useless, how to grow it and what can be done with it. First, a little "official" information.

Lemna (from Latin Lémna) - genus of flowering monocotyledonous plants of the Aroid family (Araceae).

Duck varieties:

Small duck (Lemna minor) - the most common form. The leaves have an elliptical forum, yellowish-green, reaching 3 - 4.5 mm.

Lemna (Lemna polyrrhiza) - in this species, not one root, but a whole bundle, leaves each leaflet. Fronds are round and relatively large - 6 mm. The underside of the leaf is purple.

Lemna (Lemna trisulca) is one of the few species of duckweed that swims in the water column. It rises to the surface only during flowering. Leaves reach a size of 1 centimeter.

Humpback (Lemna gibba) - this duckweed, often found in the aquarium. Its leaves are glossy and convex, as if hunched. Size 5-7 mm. This is the fastest growing species of duckweed.

Well, now let's go directly to the issue of aquarium content of duckweed, its application and benefits.

There is an opinion that this small plant is useless in the aquarium economy, they say it is not beautiful and in addition covers the entire surface of the water surface, which significantly reduces the intensity of light, so necessary for bottom plants.

In my opinion, such sayings frighten a novice aquarist from breeding it in their reservoir. With such a categorical opinion, all its merits are unreasonably wiped out:

First of all, Lemna is so not fastidious a plant, that it can easily live and multiply without any care and special conditions. A minimum of light is all she needs.

Secondly, duckweed is a very useful plant, it contains bromine and iodine salts, there is practically no ascorbic acid in it. Lemna, being in aquarium water, releases it into plenty of oxygen, which greatly enhances and improves its quality. And of course, duckweed, like other aquarium plants, is a good helper in the fight against nitrites and nitrates in the aquarium.

You can list further the beauty of this rastyuchki. Perhaps the convincing argument is the fact that not only fish but also people "love" it. Lemna is an excellent homeopathic remedy. It can be taken as a desensitizing and antipyretic agent. Relatively recently, an anticarcinogenic effect was found in duckweed.

So the question is - how can you not use such a lovely plant in aquarism? At the same time, no one says that she should perform decorative functions and she needs to cover the entire surface of the water. The number of duckweed in the aquarium is easily controlled, moreover, it can be grown in any single vessel (bucket, basin) without any aeration, filtration, dressing and "decent" lighting. The only requirement of this plant is a temperature in the range of 12-30 degrees Celsius.

Now let's talk about the benefits of duckweed and its application:

It is no secret that feeding fish should be balanced and correct. And this means that both protein and vegetable foods should be included in their diet, for details see the article:how and how much to feed the fish.

To achieve these goals, many aquarists in addition to "meat food": live food, freezing, special stuffing and dry food give either special food containing plant elements, or feed their aquarium pets lettuce, spinach, fresh cucumber, cabbage leaves and even carrots.

The above vegetative top dressing is good, but agree that the duck is more natural top dressing, besides free!

Cultivation of duckweed is especially necessary when keeping a Goldfish family, they really like to feast on this plant. However, it is worth noting that it is not possible to grow a duckweed in a "golden aquarium", because the ear buds will eat it immediately. I grow a duckweed in an aquarium with an angelfish and about one twice a week I transfer it to an aquarium with goldfish. If you do not have a second aquarium as a "bed for duckweed" any basin or bucket will suit, other dishes that you want to put in a warm, bright place. Thus, you will ensure the fastest possible growth of the plant.

Recently, due to the lack of duckweed, I even began to throw it into buckets, where the water is replaced for weekly replacement. In a week, the duckweed in the “settling tank” grows, plus it additionally improves the quality of water.

It is also worth noting that if you have a surplus of duckweed, it should not be thrown away. Leash can be dried, then mixed with any dry food and given as needed.

Who else recommended duck? Many people know how cichlids relate to living aquarium plants, duckweed recommended by many South American and African cichlids. Also, duckweed is recommended for some labyrinths (gourami, lyalius, macropods, etc.) and viviparous fishes (guppies, swordtails, mollies, petilles, etc.), for the first duckweed appears as a “spawning substrate” —they build "nest" for the second duck is an excellent shelter for the larvae and juveniles.

I hope the above information levels off the prejudices of some aquarists about the futility of this plant. Lemna - there is a place to be in our waters.

For the credibility of some of my arguments, especially for this article, I conducted a small experiment with a duckweed. In three bowls, I put on one grill.

The first bowl, I put on the east side, where the sunlight comes in the morning and until 12.00.

The second bowl, I put in a shaded place

Third, put on the west side, where the sun shines brightly from 12.00 until evening.


In the first bowl formed 3 children of duckweed

In the second bowl 2 ducks formed

And, in the third 8th subsidiary of ducklings

From the experiment, we can draw conclusions:

- Lemna is unpretentious, it can be grown in anything

- it grows exponentially. This means that the duckweed is a beautiful and free fodder crop.

- yet the minimum conditions (light) the plant needs

Video duck in the aquarium

Humpback, Lemna small, Lemna tripartite - aquarium plants.

Housing conditions
  • Latin name: Lemna gibba
  • Family: Lemnaceae (Lemnaceae)
  • Russian name: Humpback
  • Habitat: America, Europe, Southwest Asia
  • Temperature: 12-30 ° C
  • PH Acidity: irrelevant
  • Lighting: 0.5-0.8 W / L
  • Growth rate: fast

Description:Humpback - small, floating, perennial plant. Escape (or frond - what usually perceived as a leaf) - entire, egg-shaped. May be separate or loosely coupled to another leaf. Length is from 1 to 8 mm, width is from 0,8 to 6 mm. The upper surface is flat, and the lower is convex, hump, hence name of aquarium plants. Maximum sheet thickness up to 4 mm. The color is green, sometimes with tiny red spots. The lower convex part may also be red. Inside, the leaves are filled with aero chambers that provide them with buoyancy. Stems are able to reach lengths of up to 1 meter.

Sometimes duckweed is used as a feed additive for herbivorous hydrobionts: collected, dried in the sun, and then ground to powder.

Care Requirement:Lemna is light-requiring, and good lighting is the only thing it requires for rapid growth and comfortable existence. It should not be forgotten that too powerful lamps can cause excessively strong growth of duckweed, and then it will be difficult to get rid of it. If the plant looks weak, does not multiply and does not grow, then all the signs of low water saturation with nutrients are available - it means you need to make fertilizer. The temperature limits for this plant are very wide: from 12 to 30 degrees. The acidity and hardness of the water are not particularly significant. Is that the pH below 4.0 will be quite a destructive factor.

Landing in the aquarium: Due to its external originality, duckweed is perfect for decorating an aquarium. It floats on the surface, creating a cozy and beautiful biotope. True, plant growth in her case, phenomenally fast. Child shoots appear from a pair of side pockets at the parent plant. The way to combat growth is to pick up a part of the population with a net or simply with your hands, and also to turn off the upper lamp for at least a week. Side lighting while you can leave. Due to rapid growth, some lovers find duckweed undesirable. kind of aquarium plants. And it even gets into the aquarium, usually with new fish, plants from the pet shop or with daphnias caught in the nearest pond.

Lemna low content

Plant and maintain the plant is not difficult. The chemical composition of water is almost irrelevant. Absorbing mineral substances from water, it can clean it from excess of many mineral substances. Well saturates water with oxygen. Maintains temperature from 10 to 30 ° C. The optimum temperature is about 20 ° C. Does not need additional dressing. It multiplies and grows quickly and in a very short time is capable of covering the entire surface of a reservoir, regardless of its size. Therefore, most aquarists tend to regard duckweed as a weed. And really, what is this cultural plant over which one should not shake and which grows on its own, practically without stress on the part of man?

Lemna small Growth control

hydra can be brought into the aquarium with plants

If you decide to buy a duckweed, you need to keep in mind that, most likely it is collected in one of the country ponds, and in no case should it be allowed into the aquarium without quarantine. It is necessary to carefully examine it for the presence of mollusks and protozoan parasites. And only after a two-week quarantine, it is possible to put a certain amount of fronds into the main aquarium or into the breeding area of ​​labyrinth fish. More often in the aquarium Lemnaingested with other plants or poorly washed live food. And from this point on, the aquarist will have the task of either completely destroying the uninvited guest, or at least keeping its number within acceptable limits.

For this purpose, the mechanical collection of duckweed net from the surface of the water. Collected duckweed must be placed in another vessel with water. This vessel should be shaken properly, to ensure that you do not scoop a net along with the duckweed baby fry or shrimp hidden in it, if you hold them. And only by making sure that in the plexus of its roots there are neither fish nor shrimp, it is possible to continue the processing of green mass.

The green mass collected in this way can be dried in the shade and used as a vegetable food for fish. If you set out to completely get rid of small duckweed, then you need to collect all the fronds from the surface and leave the aquarium without overhead lighting for about a week. For this period, you can temporarily adjust the side lighting. During this time, as a rule, all the smallest fronds that could not be mechanically assembled perish. Also in the fight against duckweed can help the fish, who consider it a delicacy. For example, lyalius.

Ka see Lemna has many wonderful properties that may be a person will find application in the future. After all, the yield of green mass from one square meter is truly a record one - in the southern regions up to 20 kg per season. And its endurance, unpretentiousness and adaptability expands its habitat right up to the Arctic Circle.

In the aquarium, this plant can also do good service if the aquarist is able to handle and control its growth. However, though a number of positive points are listed that are able to justify the content of duckweed in an aquarium, before you decide to consciously put it on the surface of the water, you should again, how you should weigh the pros and cons. Lemna It is considered a weed because of its rapid growth. Before you put this plant into your aquarium, you need to be sure that you will cope with its rampant growth. And you can get rid of her when the need for her “services” disappears.

Lemna three-part photo with names

Growing area

Three-sided leash (Lemna trisulca) can often be seen in lakes, ponds and other standing water bodies located in the temperate climate zone.


Lemna grows under water, forming beautiful open-air thickets at a depth, and only during flowering can it be seen on the surface. Thin light green leaves are collected in groups of three. Each sheet has an elongated shape with a sharp tip, the sheet is about 10 mm long. Among the thickets, Legs love to hide and spawn aquarium fish.

Conditions of detention

Favorable for growth Stitches triple The following conditions are: the temperature of the water should be in the range of 18-22 ° C, the hardness should be up to 8, the water should have a neutral or slightly acidic reaction. The plant prefers bright natural light, but without direct sunlight. For artificial lighting, fluorescent lamps of at least 0.5 W / liter are best suited. The aquarium, where the Duck grows, requires good filtration, because plaque deposited on the leaves prevents proper nutrition and can lead to plant disease.

Lemna rarely found in amateur aquariums due to some difficulties in the content. This is due to the seasonality of growth: in winter, the plant must be transferred from the aquarium to a separate container, where the temperature should be 5-12 ° C and dim light. In the spring, the overcrowded ryaska is returned to the aquarium.


Breeds Lemna vegetative way. In nature, under favorable conditions, this aquarium plant can quickly cover the entire surface of a reservoir. At home, in order to avoid unnecessary shading, it is advisable to periodically thin out the Duckweed.




Lemna in the aquarium

In most cases, duckweed in an aquarium appears by chance. This unpretentious plant, taking root in any conditions, is used as an additive to the feed, or to create a shadow.

The main types of duckweed

Four species of duckweed are most often grown in an aquarium. The most common species is small duckweed. Its elliptical leaves, yellow - green, reach a size of 3-4.5 mm. The multi-rooted duckweed - a characteristic feature of this plant is a tuft of roots, extending from each plant. This plant has the largest leaves, the size of which reaches 6 mm. The lower part of the petals are purple. Duckweed is a species of aquarium plants that are constantly in the water column. On the surface it emerges only during the flowering period. Humpback duck - differs in convex, bent leaves about 5 mm in size. This species grows most quickly in the aquarium.

Is the duckweed useful in an aquarium?

Many novice aquarists are wondering whether the duck in the aquarium brings benefit or harm. And the majority is inclined to believe that this plant is absolutely useless. In fact, she has many positive qualities.

  1. The composition of duckweed a large number of trace elements and special chemical compounds of salts of bromine and iodine.
  2. Besides the fact that some species of fish feed on duckweed, it feeds water with oxygen and removes nitrates from it.
  3. Also, some species of fish can hide among these plants and make nests.

These useful properties will save many people from the question of whether a duckweed is needed in an aquarium.

In addition to fish, people can also use it. The duck reared in an aquarium is useful as a homeopathic remedy to reduce the temperature and reduce the body's sensitivity to the reintroduction of allergens.

Leash can bring harm in an aquarium only in a single case. In the absence of systematic thinning, it can cover the entire surface of the water in the aquarium, which will reduce the intensity of illumination.

Features of reproduction and cultivation

For breeding duckweed does not require special conditions in the aquarium. Any other capacity may be suitable. Growing it there is no need to filter and aerate water, and to create special lighting. The only requirement is to maintain the water temperature in the range of 12 - 30 ° C. The reproduction process takes place with the help of daughter plants, by forming them at the edges of the leaf plate.

Unpretentiousness in the cultivation and maintenance, as well as the possibility of using as food make duckweed one of the most useful and unpretentious plants.


The plant known to almost every person, which is found in bodies of water with stagnant water, in fact deserves much more attention.

Duckweed contains an amazing amount of healthy substances. It is necessary to figure out what kind of plant, and what are its features.

Lemna: description and variations

So in Latin is called duckweed. Она состоит из множества маленьких зеленых листиков, обитающих на поверхности воды. Растение является цветочным, но цветы встречаются достаточно редко, используются его соцветия.In diameter, the size of the leaves reaches one to one and a half centimeters. On the web you can easily find a lot of photos of plants.
The peculiarity of duckweed is that it lacks a stem, there is only one small root, and the leaves (or fronds) represent its stem, structure. Where does a duck grow? It lives and breeds in those reservoirs in which the flow of water is very weak or completely absent. Very quickly multiplying on the surface of the water, the thallus of the plant covers it with a layer of leaflets, trying to occupy all possible space.
It is often found in swamps, in ponds and small lakes. And the most famous species of duckweed in Russia is called “swamp” or “small”. It is this species that can be met everywhere in central Russia.
It is very unpretentious, capable of experiencing severe frosts, difficult climatic conditions. For example, in winter, small duckweed goes under the ice, successfully breeding at an unfavorable time of year, and, as soon as it gets warmer, reappears on the surface.
The small duckle grows everywhere except in the arctic north, preferring a temperate and tropical climate. All she needs is standing water, rich in organic living matter, so that the plant can get enough nutrition. She also loves the sun.

Although it belongs to the type of floral, its structure allows to multiply in a vegetative way, perennial. From the main structure of the plant, processes are separated, which are spread by various living creatures: this is how it spreads in nature.
Other names Lemna minor (duckweed): duck grass, frog sacking, waterfowl birds love to eat it. During the course of her life, she constantly produces oxygen, enriching the space around them.

What are the varieties of duckweed (Lemna)

It belongs to the family of Aroid plants (or - Araceae), there are various species that vary in size and some other features.

  • Lemna small (marsh). That it is common in Russia, the leaves are small, up to 0.5 cm., Bright green with a yellowish tinge. The Latin name is Lemna minor.
  • Humpback duckweed It is widely used in aquariums, it grows faster than everyone, its leaves are larger and "juicier" - shiny, bulging, up to 0.7 cm. In size. The Latin name is Lemna gibba.
  • Lemna is multi-rooted. The peculiarity of this species is that it has several roots, and not one. Size - about 0.6 cm, the leaves are round, with the underside of a leaf purple. The Latin name is Lemna polyrrhiza.
  • Lemna tricycle Unlike other species, lives in water, rising to the surface only for flowering and reproduction. The lemna is three-part used in aquaria. Leaf size - up to 1 cm. Latin name - Lemna trisulca.

Photos of various types are found on various thematic sites.

Medicinal properties and benefits of duckweed

Speaking about the impact on water, Lemna does not pollute, but purifies it, enriching it with oxygen, and is a food for various aquatics.
The chemical composition of this plant is surprisingly rich in various vitamins. In its composition are present:

  • lysine and arginine - amino acids that are not produced by the body independently;
  • various minerals: iron, magnesium, calcium, copper, zinc, iodine, etc .;
  • proteins and carbohydrates;
  • tannins, flavonoids and more.

After people saw that animals and birds eagerly consumed duckweed, they also tried and discovered its healing properties.
First, using it as a seasoning allows you to make food much tastier. Secondly, after winter, it is necessary to eat it in order to compensate for the loss of vitamins and strengthen the immune system. Thirdly, marsh leash is a homeopathic remedy, its medicinal properties are used in the treatment of various diseases, it has been used for a long time, since antiquity all over the globe, ranging from the ancient Slavs and European nations to Tibet and Ancient China.
What is the use of using duckweed:

  • lowers fever;
  • relieves pain;
  • drives bile;
  • destroys harmful bacteria and parasites;
  • removes carcinogens;
  • weakens or eliminates allergic reactions, etc.

Lemna destroys fungi and harmful microbes, also affects tumors of various kinds. The plant can be used as a sedative, it helps from a cold, stops bleeding and many others. Virtually every culture has unique recipes, where the properties of duckweed used to heal so many diseases. And take inside, insist or make compresses. Fresh leaves are applied to snake bites, used in the treatment of skin diseases, eye and eye diseases.
In the times of Ancient Russia, duckweed was used when sewing clothes and outfits.
Among the diseases that are treated with Lemna, are:

  • urticaria;
  • furunculosis;
  • jaundice;
  • an ulcer;
  • gout;
  • rheumatism;
  • glaucoma;
  • acne

List all diseases that treat "frog sackcloth" can be a long time.
In some cases, the active use of this herb is harmful: for example, in diseases of the IRR (vegetovascular dystonia). Despite the fact that sometimes the plant is used for sedation, it can be harmful if used in case of strong nervous diseases.

Aquarium duck: how to use at home

Some people may believe that using this plant in their tank does not make any sense or does harm (for example, closes the light, etc.). But in fact, lemna breeding in aquariums has great advantages. You can see how a homely reservoir covered with duckweed thallus looks in various photos or in specialized stores: experts widely use the properties of the plant.
Firstly, the duckweed trilobe and humpback is very useful for the fish themselves and the environment of the reservoir. It gives a lot of oxygen to the water, improves its quality. In its composition there is bromine and iodine, the duck aquarium helps to neutralize excess nitrates in the water.
Secondly, the duckweed in an aquarium serves as food for small fishes, is a source of protein and vegetable food. As you know, animals should eat a balanced, continuous feeding of meat products in fresh or frozen state, dry food has its disadvantages. With the help of duckweed, you can restore balance, give your fish a completely natural plant food.
For some fish (such as cichlids), duckweed in an aquarium is recommended for nutrition. In addition, duck grass can serve as a substrate, a place for spawning and shelter for young (larvae).
Thirdly, the three-sided duckweed is very unpretentious, especially it is not necessary to take care of it, these properties are very easy to maintain. There is no strong flow in the aquarium, only light is needed, and the plant will constantly multiply at a temperature of 10 to 30 ° C.

Since ancient times, small duckweed is used as an amazing tool, carrying universal benefits to people and the environment. All ingenious is simple - everyone can use this gift of nature in their life!