Crayfish in a fish tank


Types and content of aquarium crayfish

Crayfish (lat. Astacidea) is an infra-series of decapod crustaceans (Decapoda). Freshwater crayfish accrue to more than 100 species, some of which have been cultivated in home aquariums. All aquarium crayfish require special maintenance conditions, with quality care, they will live 2-5 years or more.

The rules of the content in the decorative aquarium

The maintenance of crustaceans is possible in small tanks with fresh, prepared water. If you carry out regular water changes, then an aquarium with a volume of 40 liters per individual is sufficient. Crustaceans can hide their food, so install grottoes or caves in the nursery. Filtration of water and siphon of the bottom is necessary so that the remnants of the feed will not start to rot. Periodically check all shelters. Use the internal filter for the aquarium, on the outer crayfish can easily get out.

The maintenance of two or more crustaceans will require a larger tank with a capacity of 80-100 liters. The fact is that 1-2 times a year, aquarium crayfish molt, and if one congener catches the eye of another, they will eat the last one. Spacious aquarium with caches will protect everyone from cannibalism.

What is molt? Like all arthropods, crayfish molt. Their body is covered with a hard chitinous cover that is growing, and for the growth of the new, the old must be dropped. If the aquarium crustacean hides more often, it means that it is preparing for the process. After molting, he will eat his old shell, because there is still a lot of calcium in it to grow a new one. Fully cover will resume in a few days. Juveniles are subject to frequent molting, unlike mature ones.

Look at the feeding of Cuban crayfish.

In the natural habitat (and crayfish are found on almost all continents), they eat mostly plankton and plant food. Content in captivity involves feeding with special feeds for crustaceans, sinking granules and tablets. You can give vegetables - spinach, cucumbers, zucchini, lettuce, the remnants of aquarium plants. Also add to the diet protein foods, only 1 time per week: fish fillet and shrimp, live food in frozen form. Feeding - once a day in small portions. All crayfish are easily divorced in captivity, but the rules for each species are different.

The body size of the crustaceans also depends on the particular species. The largest freshwater cancer in the world is the Tasmanian giant cancer (50 cm in length, weight - 5 kg). Other species are small, reaching 12-20 cm in length.

Is it possible to settle in a common tank?

Is crayfish compatible with fish? Keeping with fish is difficult because either fish or crayfish can be eaten. The clamshell animal with its claws can have a bite in two of such small fish as guppies, molly, neons, corridors. Crayfish hunt at night, so in the morning you can not see your favorite pets. A species aquarium is an optimal security condition for all.

Also crustaceans do not get along well with fish of the Cichlid family. These are rather large fish, and the crustacean can easily break, during the molt they are attracted by the old shell. With shrimps, their distant relatives, crayfish also live poorly - small ones can easily be eaten.

All types of crayfish eat, uproot plants. Therefore, it is not recommended to keep them in aquariums with dense vegetation. Only one species - this is Mexican dwarf cancer, ignores the underwater flora. Crayfish are cold-loving animals, which are adversely affected by the warm water temperature, so the water parameters need to be adjusted in the water tank. Each type of cancer requires certain conditions of detention.

Varieties of beautiful aquarium crayfish

  1. Yabbi - body size can be up to 20 cm in length. This is an aggressive look, which is called a "destroyer." Body color is blue, lives 2-4 years in an aquarium. Natural habitat - Australia, loves muddy water and a slow current, a lot of thickets. Allowed content at a temperature of 20-26 ° C, with a change in the temperature range, may die. A female apple gives birth to 500-1000 small crustaceans.

    Observe the life of the apple cancer in the general aquarium.

  2. Florida Blue (Procambarus Alleni) has a brown shell color in nature, but a beautiful blue cancer was obtained by breeding. The natural habitat of brown is freshwater with a slow flow in the territory of Florida (USA). Body size is 8-10 cm in length. The female can produce 100-300 rachat, which grow very quickly.
  3. Australian red-fingered (red-flesh) cancer (lat. Cherax Quadricarinatus) - like many species, grows 14–20 cm in length. The color of the shell is variegated: bluish-green with yellow patches, the claws of the males have bright red stripes and growths in the form of thorns. In nature, lives in Australia, at the bottom of rivers and lakes. It feeds on small plankton and plants. Reproduction occurs with the participation of the female and male. The female crustacean produces 500-1500 calves, which are incubated in caviar for one and a half months.

  4. At first glance, the Louisiana dwarf crustacean (Latin Cambarellus Shufeldtii) looks simple in appearance. But if you look closely, you can see the reddish tint of the shell, which can be seen horizontal black stripes. Claw cancer has a small, long and smooth texture. It does not live long: a year or a year and a half, the life expectancy of males is longer than that of females. Dimensions of the form: 3-4 cm in length, so he is rather shy and shy, does not pose a danger if he lives with small fish in a common tank. Natural Habitat: Louisiana (USA). For one breeding, females bring caviar (30-40 pcs.), Bearing it for 3 weeks. This can happen twice a year.

  5. Blue Cuban crayfish (Latin Procambarus Cubensis) - one of the most common types of aquarium crayfish. Natural habitat - Cuba. The color of the shell is very bright - blue-blue, body length 10 cm. Hardy look, tolerates changes in the parameters of the aquatic environment. However, he eats aquatic plants, and his behavior with fish is quite aggressive.

Do crayfish live in an aquarium?

When the house has a large aquarium, there is a desire to populate it with all sorts of exotic inhabitants, so that it is beautiful and unusual. Many buy crayfish and settle them with fish. But is it possible to do that? Do two different kinds of inhabitants live together in the same container?

Almost all crayfish are peace-loving creatures. They do not create conflicts, sit quietly in the shelter during the day, and go out in the evening for food. They slowly move along the bottom of the aquarium, collecting prey. But sometimes the crayfish in the aquarium and fish - it is not compatible. There are many reasons for this.

Most importantly, small fish can easily eat cancer. Despite the fact that the fish move much faster, at night they sleep at the bottom of the aquarium. At this time, the hunt goes cancer and eats everything that is bad. He may not eat other inhabitants, but fairly cripple them, leaving without a beautiful tail. This applies to big fish. And sometimes it even causes serious wounds, after which the fish die.

The second reason for incompatibility is a possible famine. Pisces do not know the feeling of saturation and are able to eat everything that they will be given. Due to this slow, nocturnal crayfish may simply not get food. Having lived in hunger for several days, they will die.

This problem is quite easy to solve. You need to buy food that settles immediately to the bottom and pour it into the aquarium in the evening when the cancer comes out to eat.

Do crayfish live in an aquarium with other inhabitants? They live, but it is important to find him normal neighbors. Fish should be calm, not predatory, not very small. In this case, a favorable neighborhood is possible.

But, nevertheless, it is better to equip a separate terrarium for crayfish, where all conditions will be created for it. For example, they need a snag to get to the land. And the walls of aquariums must be high so that the crayfish cannot get out. Again, food. You can feed them with pieces of meat or fish. The remains of food quickly deteriorate and pollute the water. And often you can not replace the fish in the new liquid.

Wanting to get a crayfish, it is better not to risk the existing fish and not experiment with the health of a new tenant. Cohabitation can bring a lot of trouble to the owner and the cost of new fish. Therefore, it is better to equip another aquarium and then quietly enjoy the vital activity of healthy fish and crayfish.

Crayfish in aquarium

Crayfish in the aquarium are special inhabitants. The unattractive gray inhabitants of reservoirs wonders of breeding turned into real beauties. Their number is more than one hundred species: apricot crab, Cuban blue, peaceful by nature dwarf marsh, white Florida Florida and many others. Now decorative crayfish living in an aquarium, no one is surprised. To make them feel comfortable, you need to create for them a certain microclimate and even to equip the design of their home.

Caring for crayfish in an aquarium

The most demanding to the conditions in the aquarium familiar to all the crayfish, because in nature it is used to constant temperature changes. These crayfish do not like to be too hot. Water temperature above 25 ° C contributes to frequent molting, and this in turn affects the duration of their life. They feel well in non-acidic water of medium hardness rich in oxygen. It is necessary to be very scrupulous with regard to the chemical composition of water, since they can die from the smallest amount of copper, nitrates or nitrites.

Cancers behave actively at night, so they feed them in the late afternoon. The male is given food once every two days, and the female once every three days. The amount of food increases during the breeding season and molting. Feed the crayfish can be a special feed from the pet store, both animal and vegetable origin, but they still love the plants more. You can feed the crayfish with dry leaves of beech, oak or alder, which help clean the intestines.

When picking up algae in an aquarium with crayfish, you need to consider that they will undermine their roots and try to snack on the stems in order to enjoy.

Equally important is the presence of shelters. During critical periods, such as molting, they hide most of the time. Therefore, there should be more shelters in the form of pipes, stones, snags and other objects in order to avoid a battle for the territory than the crabs themselves.

It is advisable to cover the aquarium; inside it you need to build a snag hole to get the cancer to the surface of the water.

Crayfish in the aquarium do not always get along with the fish. Someone from this neighborhood may suffer. It is impossible to keep along with crayfish bottom lovers, such as catfish, as well as goldfish and angelfish. which they can cut their tails and fins. Large cichlids that infringe the rights of crayfish are not suitable for living together.

Gray-spotted crab - marble aquarium dweller

Among the inhabitants of the aquarium there is one very curious representative of crustaceans - the marble cancer. Its maintenance and breeding does not take a lot of trouble, it is curious to watch him, and in food he is quite unpretentious.

This cancer got its beautiful name due to the color that resembles marble patterns. In nature, marble crayfish live in fresh river water. Another name is gray-spotted cancer.


Gray-spotted cancer hardly differs from its relatives. Adults grow up to 10-15 centimeters, including whiskers. Only born crayfish are very tiny - they resemble fleas, and they are even difficult to notice if not to look closely. Crayfish color from greenish to brown and black. At the same time the back is decorated with a pattern similar to stains on marble. In young crustaceans, this pattern is barely noticeable, but the older the cancer becomes, the clearer the pattern.

Gray-spotted cancer regularly sheds. A couple of days before the molt, he becomes fearful and sits in shelter. Many novice aquarists are frightened by the appearance of a discarded pelt, but this is a completely natural process. The shell can not be thrown away: when the cancer grows new, it will get out of the shelter and eat the old shell. It contains chitin, and, eating it, the pet replenishes the reserves of this substance to strengthen the new armor.

Marble crustacean is awake in the dark. During the day is not very active, preferring to sit in the shelter. Life expectancy is about 18 months.


The content of marble cancer requires space. The aquarium is usually selected on the basis of calculations of 5 liters per individual. The best option is an aquarium for 100-150 liters. If there is not enough space for a cancer, it will grow badly, and the life expectancy will decrease significantly.

As these crayfish are river, they will feel most comfortable in the water with good aeration and filter.

Water requirements:

  • temperature: from 20 to 28 degrees;
  • acidity: pH 6.5 to pH 7.8;
  • hardness: 8-12 dH;
  • Partial water change is desirable to carry out about a quarter of every 10 days.

Deciding to start a cancer in the aquarium, do not forget about the numerous shelters. He is a night resident who prefers to lie down in dark secluded areas during the day. You can use anything to create houses: chopped clay bowls, shells, coconut skins, snags, plastic tubes and much more. If in aquarium conditions there are several individuals at once, you need to make a shelter for each.

Sand or small pebbles are suitable as soil. Crayfish produce a lot of waste, so siphon soil will have often.

Be sure to have a cover on the aquarium! Cancer may seem cumbersome and sedentary, but in fact it is quite capable of deftly getting to the surface on objects established in the aquarium. Naturally, once on the surface without water, the cancer will die.

The content of cancer "threatens" you with almost complete rejection of plants. Choose a floating species - ground plants bite the cancer with their claws in rags. You can try to use Javanese moss, its crayfish usually do not touch, but the likelihood is still there.


Gray-spotted cancer is very unpretentious in food. This is mainly plant food. It can be given dry compressed feed (for example, for ancytrus) and natural products. Finely chopped spinach or lettuce, mashed carrots, zucchini and cabbage, peas and corn - all this can be included in the diet of cancer. Before feeding the crustacean, the vegetables should be scalded with boiling water, cooled and chopped.

In order to keep a full ration in winter, you can prepare food in the summer and send it to the freezer. Before feeding, freezing is filled with boiling water, cooled and fed to crustaceans.

The full development of cancer in an aquarium requires the presence of protein foods. About once a week he is given fish meat, pieces of baking or shrimp. It is better to feed the crustacean in the evenings when it wakes up and becomes more active.


Reproduction of marble crayfish - their feature. They multiply in a rather interesting way - parthenogenesis. This means that all individuals of only one sex - female. Their eggs can grow into full-fledged embryos without fertilization.

For about a month, the female bears a spawn, trying to hide in shelters. 50-100 crustaceans are born at a time. Since crayfish are lovers to feast on their own cubs, the female will need to be transplanted. But not immediately, as soon as you see the first babies - the process of the birth of crustaceans reaches days.

Since newborn crayfish are very small, catching fry is not easy. Better before reproduction begins, transplant the female into a separate aquarium. From the first minutes of life, small crustaceans feed on the same food as adults - vegetable food with added proteins.

Breeding crayfish - a responsible matter, if only because they are quite prolific. Therefore, it is better to immediately determine what you do with young crustaceans.


Marble crayfish can be kept in an aquarium with other inhabitants. Crayfish are quite friendly, but they cannot be kept with bottom fish (for example, catfish) and snails - conflicts can constantly unfold between them. Also, refrain from co-colonization of crayfish and veil fishes - their beautiful tails and fins will easily be damaged by the claws.

Crayfish do not get along with cichlids, especially with large ones. Fish simply eat cancer. Small cichlids pose a danger to crustaceans during the molting period, when they are most vulnerable.

Best of all with crayfish live fish, frolicking at the surface of the water - the swordtails and guppies. However, the danger that the fish can be eaten, still remains.

If you want to add zest to the aquarium, marble crab is a great solution. Compliance with a few simple conditions - and in your aquarium will be a pretty crustacean resident with a charming coloring. And ease of care allows you to get crayfish not only experienced aquarists, but also beginners.

Is it possible to keep crayfish in a fish tank


Cancers cannot be kept with bottom fish (the same catfish) that will compete for food and shelter, with small fish (neon, guppy, etc.), because at night when they sink to the bottom, he can eat them, any fish with a veil and threadlike tail and fins (goldfish, angelfish, labyrinths). It is also impossible to keep with large and aggressive fish, because the crayfish themselves can already suffer here. The temperature of the water in the aquarium should not exceed 25 degrees, the aquarium should be spacious. We need a large soil, because the crayfish dig their holes. Be sure to live plants that they will eat. In the aquarium should be shelter. Желательно предоставить возможность выходить из воды на сушу. Питаются раки тем же, что и рыбы, но еда должна падать на дно (например, корм для донных рыбок, мотыль и т. д.) . Следите, чтобы раки не недоедали, т. к. они довольно медлительны, и рыбы могут отобрать весь корм.

Yuri Ivanovich Podlesny

I kept a couple of crayfish in a 50-liter aquarium with macropods. About shelter, pulling out plants and digging up the soil - all true. Cancers are themselves designers. You can feed any feed with a high plant content. Plants from the aquarium, they practically do not eat, just shred from creative considerations. Not a single fish in my crayfish has suffered, although this does not mean that it would always be like this. I sent the crayfish into the pond when the clouds of suspension in the water from their bulldozer activity were finally bored.

And how do cobs and shrimps coexist with fish?


Crayfish, shrimp and fish together in an aquarium are incompatible. Fish with shrimp, but those without claw-filter feeders, get along well. I have been living athepsis shrimps for almost three years with fish.
Lived with fish and tiger prawns with pincers. They, like crayfish, hunted fish. And all the fish had tails and some plants bitten. If then atheopsis lived there, they would have been eaten long ago. Shrimp even molted each other during the molt, they are such predators.
But it is better to keep crayfish separately from both fish and shrimp. They are also predators, although they feed on plants. For crayfish, you can run guppies or other short-tailed fish into the aquarium. Even guppies with colored and long tails eat crabs very quickly. Survive only short-tailed.
Crayfish also repent all living vegetation. Therefore, crayfish need a separate aquarium with artificial hard-leaved plants and a lot of shelters, where they hide during molting and from uninvited guests.
Crayfish always eat shrimp. It is their natural food and competitor in the aquarium. Cancer will eat anyone who comes close to it while eating.
I had crayfish living in an aquarium with fish, small rodents were eaten during molting by big fish, and crayfish had bigger tails for many fish, and one crustacean even saw agamiksis in half, although it was about the size of a cancer.


Crayfish can bite off uryb tails, and our shrimps hid from fish in secluded places, so much so that they are not visible at all, they are alive or not, only with a rare general cleaning of the aquarium they could be detected.

Aquarium with crayfish and Florida