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Lemna in the aquarium

maintenance, care, compatibility

Greetings to all aquarists and regular readers FanFishka.ru.

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, some “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 a capricious plant that it can easily live and multiply without any care and special conditions. A minimum of light is all she needs.

Secondly, Lemna 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 improves 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. Probably, the convincing argument is the fact that it is “loved” not only by fish, but also by people.

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, either give special food containing plant elements, or feed their aquarium favorites with lettuce, spinach, fresh cucumber, cabbage leaves and even carrot.

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” – in it the fish 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.

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 deciding to consciously put it on the surface of the water should be done again, 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 it when the need for its “services” disappears.



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.

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.

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 water environment. 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!

О admin


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