maintenance, care, compatibility
Freshwater crabs are divided into species, most often they are representatives of the genus Decapod, family Potamonidae, which charges more than 100 species. They are found in temperate and tropical latitudes.
The freshwater crab Potamon Potamonis (Dutch) lives in the Black Sea. It feels great in water with low pH and hardness. Like all amphibious arthropods, it lives partly in water and on land.
In aquarium conditions it is recommended to keep it in fresh water.
In the natural environment lives only 2 species of crabs, accustomed in fresh and salt water. These are freshwater Eriohair and Helice. They came to us from the Far Eastern countries, and belong to the Grapsida family.
They can move from the sea to the rivers, they can also be kept in home aquaterrariums. They need clean and oxygenated water, in other conditions they die.
In tropical aquariums they often contain a crab with a special name – “vampire”. His homeland – Malaysia and Thailand.
The color of the body is purple-violet, the eyes are red, most likely, got its name because of the appearance. The vampire leads a land life, in the aquarium can live with a group of relatives.
Vampire crab eats peat and protein feed.
See what a vampire crab looks like.
In the nurseries of lovers you can often see the small crab of Cesarmid, which hails from tropical rain forests. Dwells in mangroves, where there is an abundance of sandy and silty soil.
It feeds on small crustaceans and insects.
Red-crown crab – comes from the Indochina Peninsula. On a 4-centimeter body, bulging eyes are noticeable, the body is red, oval and flattened at the sides.
It is recommended to settle in tanks with snags, branches and stones. Do not eat plants, but often digs out of the ground.
Thai microcrab Limnopilos niyanetri – found in freshwater rivers in Thailand. The body size is only 1 centimeter.
The shell is light gray, claws brown. Easily adapts to the aquarium.
The New Zealand spider crab Amarinus lacustris – with a brown or dark green body color 2 cm long. Loves aquaterreriums with abundant vegetation, many prongs, branches and labyrinth tunnels.
Leads nocturnal, itself peaceful and slow.
Favorable content in clean water and enriched with nutrients feeding does not guarantee the appearance of offspring. This is due to the fact that crabs – territorial animals, are prone to conflict.
Even the owner can pinch the finger.
In the natural environment, arthropods breed for three summer months, when the weather becomes warm and comfortable. Breeding females simultaneously monitor the older brood, bearing new spawn. Fry in the first months of life often molt.
Breed in the prepared shelters. Due to their nature, they are very sensitive and aggressive during this period.
Aquarium crabs from the infraorder decapod crustaceans inhabit the oceans and seas. There are only about 100 families spread all over the world.
The aquarium crab has become a welcome guest of home aquariums due to the interesting behavior and beauty of its color.
First you need to choose a suitable aquarium or aquaterrarium, as a freshwater crab needs more land than water. The land area should be about 30/35 cm.
The content in the aquarium implies a small level of clean water, from which protruding stones should appear on the surface, on which the crab will dry or bask under the lamp.
Crabs need shelter in the form of caves, grottoes, logs and pots. So their conflict with other inhabitants will decrease.
Crabs, like other crustaceans, often escape from the tank through cords or other ways, so the aquarium should be closed with a net or glass, while ensuring normal air circulation.
Good water filtration, moderate lighting, maintaining the correct temperature of 22-25 ° C and salinity of water are needed. Acidity should be not less than 7.5, and the hardness not less than 10 °.
Mineral-rich water will greatly facilitate the life of crabs in captivity. The sand should be regularly washed, as there is accumulation of crabs excrement.
Weekly you need to replace a quarter of the volume of water and siphon the soil.
The crab feels keenly that the water contains metal impurities, especially copper. Oxygen compressor plays a big role in the life of crabs.
One of the common causes of the death of crabs is overcooling or overheating. In a comfortable environment, these aquarium crustaceans live 3-4 years.
What crabs eat: make up a pet menu
Crabs are not only a tasty dish in a restaurant. Today, a new and rapidly growing trend has become the equipment of aquariums with sea water. Therefore, crabs have become favorite pets.
Interesting and clever enough, with a peculiar behavior, they attract the attention of fans of the underwater world. By the way, crabs exist a great many, there are freshwater individuals, which can be hooked into the most ordinary aquarium.
However, today we will talk about what crabs eat.
From technical equipment you will need a filter and aerator, as well as a set of lamps. It is advisable to immediately choose a large aquarium, so that each individual has at least 0.3 square meters, because these amazing creatures love to travel.
In the water you can inhabit small fish, like guppies. But larger fish crabs caught and eaten.
In captivity, crabs grow to 10 cm and live for 5-7 years.
To multiply them is difficult, they need special conditions and sea water. They have a planktonic larval stage, so it can hardly be expected that you will admire small crabs.
However, mating behavior in the aquarium is observed quite often. This is not surprising, since almost all species behave when the conditions of detention are close to ideal.
Let’s now pay attention to our countryman. He lives in large numbers on the Black Sea coast. A lot of tourists decide to grab one with the other.
If you can bring your pets home alive, you can settle them in your aquarium. What do Black Sea crabs eat?
In principle, everything is the same as crayfish. Will be happy to eat moths, any live food, chopped meat, that is, everything that falls to the bottom of the aquarium.
However, it is very difficult to maintain a sea crab at home, because it needs special conditions. Therefore, it is better to buy in the pet store freshwater, adapted crab.
You will also be offered specialized food for these arthropods.
The most important rule here is not to overfeed. In principle, we have already listed what sea crabs eat at home. Any fruits and vegetables, berries, meat and specialized food.
The most important thing is not to overfeed the pet. Daily feeding is the greatest evil for arthropods. You need to give food three times in ten days.
That is, once every three days.
In this case, protein products can be included in the diet of the crab no more than once a week. The quantity for one individual is about a large pea. You can change food from time to time, it can be a shrimp or a piece of raw meat, a little fish.
On major holidays (in the literal sense, stick to the calendar, so as not to be confused) you can give mussels and oysters.
Be sure to give your pet mineral supplements. It can be shredded eggshells or chalk for parrots.
It should always lie on land. In the water is to add a little sea salt, which is bought at the pet store.
Add will have to the eye, so it is better to less than more. This is important in order to preserve the integrity of the shell.
Do not use sea salt for bath, it has a lot of dyes and flavors.
Regarding this concern unnecessarily, your pet will definitely not starve. In nature, they can go without food for several months, and a week without food will not cause him any discomfort.
It is overfeeding that causes various problems with your pet’s health. The crab begins frequent and problematic molt, which is a great stress for his body.
Shedding is a normal physiological process, but in an aquarium the crab suffers from a lack of movement. In nature, it can go up to 3 km per day.
As a result, being in conditions of constant growth and lack of movement, he does not have time to go through a cycle of recovery and preparation for a new molt. And this will lead to the loss of limbs and death.
Aquarium crabs are very bright and entertaining crustaceans. These unusual creatures live not only in water, but also on land.
Therefore, an aquaterrarium is needed for their maintenance, with a dry area of at least 30×35 cm. One option for an aquaterrarium can be an ordinary aquarium filled with water not up to the top, but centimeters at 15. It should be marked with stones that will stick out of the water and serve for crab a place for taking air baths.
Crabs love to bask under the lamp.
However, you need to make sure that they do not overheat. The water in which crabs live should not be too warm either.
The optimum temperature is 25 ° C. Crabs in the aquarium do not need soil, provided there is a reliable biofiltration system.
Crab growth occurs during molting. They discard the old shell and actively grow until the new one has hardened. The process of formation and strengthening of the new shell requires an adequate supply of mineral substances, calcium and chitin.
Therefore, the addition of salt (1 tsp to 10 liters of water) and calcium chloride will have a beneficial effect on the pet. Freshwater crabs in an aquarium is a very conditional fact.
Of course, in the practice of aquarists described cases of successful content of aquarium crabs in fresh water.
But here there are some nuances: the water must be non-acidic (pH not less than 7.5) and have sufficient hardness (GH not less than 10). But still water rich in minerals will significantly facilitate the adaptation of pets to captivity.
The proportion of protein foods should not be about 1/3 of the total weight eaten. Excessive amounts of by-products, meat, squid and fish in the diet of the crab can lead to water pollution by nitrogen compounds, which are more dangerous to the life of crabs.
The presence of plants in the aquarium favorably affects the condition of the water, as they remove nitrates from the water. Given the fact that crabs have an excellent appetite and they are happy to eat fresh greens, you must immediately stock up on a large number of plants.
It is best to opt for floating plants, because everything that is planted in the ground is likely to be dug out by a crab. In order for the crab to not so actively eat the aquarium vegetation, it is necessary to offer him to eat lettuce leaves, spinach, dandelion leaves, fruits (pears, bananas, apples), vegetables (green peas, boiled carrots, pumpkin).