HealingCanh Shrimp

How to Kill Instant Water in Shrimp & Aquatic Ponds

Today we will talk about another unwelcome parasite in our shrimp tank - Freshwater Hydra.
How to Kill Instant Water in Shrimp & Aquatic Ponds

Shrimp farmers (as well as aquarists) consider them pests that can cause problems for their shrimp or aquarium tanks.

Shui Yi is named after the nine-headed sea snake in Greek mythology, which regrows its head after being decapitated. Luckily, I have a way to deal with it without chopping off its head. No Planaria, Hydrogen peroxide, Fenbendazole etc can easily remove it from the aquarium. However, we need to know more about this parasite to protect our shrimp.  

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What does Thuy mean?

Aqua is a small polyp from the same family (Cnidaria) as anemones and jellyfish. While most cnidarians live in the sea, hydra is unusual in that it lives only in fresh water.

It was first described by Antoni van Leeuwenhoek (1632–1723) in a letter he sent to the Royal Society on Christmas Day 1702. These creatures have long fascinated biologists due to their ability ability to regenerate from their fragments.

Remarkably, even cells from a mechanically separated hydrocele can recover and fully reassemble in about a week. How this process happens scientists still don't fully understand.

Classification of hydrocephalus

A number of aquatic species have been recorded, but most are difficult to identify without detailed microscopy. However, the two species are very distinct. They are most common in shrimp and aquarium tanks.

Hydro ie ChloroHydra Viridissima (water ie green)


Being a bright green species, due to the presence of many species of algae called Zoochlorellae, they live as symbionts inside endothelial cells.
In fact, they are usually more white in color. Green algae carry out photosynthesis and produce sugars used by hydroponics. In turn, the aquatic carnivorous diet provides a nitrogen source for the algae.

The ivy is small, rarely more than 0.4 inches (10 mm) long, with tentacles half the length of the pole.

Water means oligoctis (water means brown) 


It can be easily distinguished from other water hyacinths by its very long tentacles, which can extend up to 5 cm or more when relaxed.
The column is pale brown, 15 to 25 mm in length, with the base clearly narrowing to form the "stem" or "legs".

Aquarius spawn in the aquarium

Water ie reproduce asexually and sexually, hyacinth undergoes two mutually exclusive modes of reproduction: at a temperature of 18–22 °C, they reproduce asexually by budding. 

Aquatic reproduction usually takes place asexually by a process known as "budding". The shoot-like growth on the body of the water plant, the “parent” eventually develops into a new individual separate from the parent fish.

When conditions are harsh, or there is a shortage of food, water hyacinth can reproduce sexually. A single individual can produce both male and female sex cells, which are released into the water where fertilization occurs.

The eggs develop into larvae, which are covered with small hair-like structures called cilia. The larva can either settle in immediately and develop into a hydrocephalus or be enclosed in a tough outer layer that allows it to survive in extreme conditions.

How quickly does Shui regenerate?

The answer is very fast! Under favorable conditions, water hyacinth can "generate" up to 15 small water hyacinths per month. Which means every 2-3 days it makes a copy of it.

One water instant, in just 3 months, has the ability to generate 4,000 new water instants.

Why is water so dangerous to shrimp? 

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In the wild, hydra feeds on small aquatic invertebrates that are paralyzed by stinging cells when prey comes into contact with the tentacles. The prey is then brought to the mouth by the tentacles and brought into the body of the hydra.

Some of their favorite foods include creatures twice their size such as Daphnia, Cyclops, and other freshwater flippers.

The spawning and life cycle of the shrimp was in another article and it took 14 days for the juveniles to reach 5.4mm in length. This means that Thuy Tu can easily catch a 14-day-old baby shrimp. Any small shrimp under 1 month old will be in mortal danger if there is water in the tank.

NameHydra (water instant)
Typeparasitic polyps
Danger levelabove average
Treatment Easily
Effective treatment100%
Treatment cost50k-300k
Treatment timeAbout 1 week

How does Thuy eat?

Water means predators and voracious eaters. They feed on worms, insect larvae, small crustaceans, small fish and other invertebrates, such as Daphnia and Cyclops.  

Shui is not an active hunter. They are classic ambush predators that usually sit and wait for their prey to get close enough to attack. The prey is immediately close enough to trigger a stinging cell response.

It was an instinctive reaction. The tentacles then begin to curl and close to the victim, pulling it into the mouth at the base of the tentacle stalk.

If it is small enough, water will eat it. If it is too large to consume, it will be discarded. In the absence of enough prey, they can forage some amount of food by absorbing organic molecules directly on the surface of the body.

When there is no food, hydras stop reproducing and start using their own tissues for energy. As a result, it will shrink to a very small size before dying.

How to get water into the tank?

Cling to new trees, wood, or rocks harvested from outdoor water sources. They can sneak into your tank like snails. It's almost impossible to notice them. In particular, when they retract their tentacles look like a floating piece of sand or a bit of floating debris.

How to remove water from the aquarium

Don't try to strangle it with anything. Remember that they can regenerate themselves.\

1. Manual Removal

If it is a small infection, you can try to remove it physically. Really the best way to kill them is to grab them and just remove them from your tank. You can also take out any water sign you see. If there aren't too many, just be careful not to damage them when you take them out.

2. Reduce food sources

Thuy means a predator. They only eat living things that they kill with their poison. Overfeeding often increases the population of the tiny prey that the water hyacinth feeds on. So it is better to avoid overfeeding, which is a very common mistake with many shrimp farmers. Use plates to control food.

You can try to starve water immediately. Like most pests, water hyacinths can only gain a foothold if they have access to food. Cutting back on food and giving targeted feeding can help keep water under control. It's a permanent solution (at least a few weeks), and it will work.

3. Add fish

Aqua itself is food for any fish willing to eat them. It is said that Sparkling gouramis, Blue gouramis, etc. will eat water. The problem is that the fish is the problem of the shrimp tank. Even small fish can wipe out the shrimp. In my opinion, it's not worth the risk in this case.

4. Add snail

There are several species of snails that are reported to be water-eaters, for example:
- Pond snails,
- Marisa cornuarietis,
- Asolene spixi snails.
However, don't think that the snails will particularly hunt for water hyacinths. Unfortunately, these snails (especially Marisa cornuarietis) can also eat certain plants. So be careful and do your research well in advance.

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The other important thing that most freshwater snails benefit from is the consumption of waste products. Because they are consuming waste products, less waste goes to microscopic organisms that can be a food source for aquatic animals.

5. Temperature

You can try using the heater to kill the water lice. In this case, you will have to remove all the fish from the tank if you do not want to kill them all. Then increase the temperature to 41-43 degrees Celsius for a few hours.

Most plants will survive this treatment. It's not a long time and shouldn't be hot enough to harm most of them. However, if you have any very sensitive or high-value plants, you should take them out and place them in separate containers of water. 

Another way is to put it in very cold water. Unfortunately, it can sometimes be more inactive than dead.

6. Light Trap

Mercury reacts to light, which is why you can see so many of them on the front glass of the aquarium. You need to:
– Shade your aquarium or turn off the lights completely.
– Add another piece of glass to the glass from inside the aquarium.
Use a flashlight or any other light source to let light pass through these 2 layers of glass.
- Wait a few hours.
– At the end of the day, the glass will move to the light and stick to this piece of glass.
– Carefully remove the second glass with the glass on it.
This method will not remove all. However, it can reduce the amount significantly. It is better to combine it with other methods.

7.Drug against water

Hydrogen peroxide (H2O2) - Hydrogen peroxide

Hydrogen peroxide is an oxidizing agent and is commonly used to kill bacteria on cuts or wounds.

When applied, the enzymes present in the cell act as a catalyst and the H2O2 begins to break down the water and oxygen atoms, which are in dire need of a second electron, damaged cell walls, and bacteria. dead bacteria. This is also how it kills water.

Warning: DO NOT overdose. Double check your calculations. Overdosing can kill your shrimp.

The recommended safe level is 14.3 ml H2O2/L, which is approximately 50% of the maximum applicable non-lethal dose (NOAEC).

Measure the water volume of your aquarium. Consider substrates, decorations, etc.

– Turn off your filter
– Use 3% Hydrogen peroxide with 1.5ml / 4.5 liters of water
– Spread H2O2 evenly over the surface of the aquarium.
- Stir gently to spread the water.
– Wait for 60 minutes
– Turn your filter back on.
In the same week, change the water and add your favorite microorganism back to the tank.
Note: in addition to killing water, it will give your tank a fresh start but with a filter that has been cycled.

Sea salt or table salt that does not contain iodine

In addition, sea salt or non-iodized table salt is said to kill water. Therefore, you can give 20g per 100 liters of aquarium water. It is not dangerous to plants and shrimp as claimed by shrimp farmers. Even in higher rates over a few hours.

No-planaria, Planaria Zero, Canine Dewormer safe-guard, and Panacur 

Medica alll

Use the above drugs with the dosage from the manufacturer to destroy the water hyacinth

There is no reason to panic if you have found water in the tank. They will not destroy your shrimp in a flash. However, it is better to prepare to deal with water as soon as possible. To reduce any loss. 

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