Many complications with health can be avoided by offering your crabs a constant environment , waterconditions and also a well balanced diet.
They are very sensitive too about fluctuations in temperatures. Keeping the temps too low or too high, must also be avoided. Also a light increasing of the nitrat are not toleratet as well for more than some days.It's also one of the most cases of death for aquarium-crabs. Social and emotional stress can make a crab sick as well.
Therefor the immune system isn't able anymore to work as well and finally several deseases can go inside the crab.< br> In despite of all precautions it sometimes can't be prevented, that crabs feel suddenly sick or suddenly die.The knowledge about this fascinating animals is too small until now. So it seems important to me, that we, the crab owners should collect and exchange informations and experiences.
This alo contains the knowledge about water chemistry and biological occurences in general.And the more you find out the more exciting this stuff seems to be.
The care for crabs isn't so very easy as many petstores are telling their customers. Some fundamental rules, exactly observing the crabs and the capability to realize after that what to do, finally are enabling a succsessful care for this exciting guys. br> Thus the death of my first two crabs is contributing a better life for the crabs are now living in my tank: Hannibal and the two ladies.
The begin of some deseases and problems can't be realized, so when the crab is really sick, it's too late in the most cases. Although you maybe know what's going on, than there is very often no possibility to help the sick one. Occasionally it may happen, that the after - affect of the care in the petstore ( when it is not beneficial for crabs at all like bad or lack food, too much crabs in the tank) comes out later in the new home.
Mostly the first molt in the new tank is ending with death, because the petstores had not realized, that crabs need calcium riched water and well balanced food.< br> To avoid some deseases of your crabs, offer them the leaves of some special trees:beech leaves for example.The 'humine' acids are helping to power up the immune system.And you will realize, the crabs like it!
But offer not the fresh leaves, better some rotted ones.Not from nearby some streets.
At this point I described before the foamlike substances as sign for breathing problems.That maybe prove right for other crab species,but not for our Red Clawed Crabs.
They are able to breath out of water in two ways: with their own watercycle and also through their skin.
This substances also can be realized at Red Clawed Crabs, but unfortunately I don't know exactly what's going on.I just lost a female crab with this foamlike substance appearing near the gills.I think it was maybe a kind of poisoning ??
But is was not a breathing problem for sure!.
For some time breathing out of the water is possible as well by creating a watercycle by the crab itself. The water is running from the mouth to the gills. (see also ANATOMY / RESPIRATION...). But once in a while the water inside the crab must be filled up again.Isn't the crab able to return back to the water, or because about other reasons it can't go back, there can be some foamlike substance be realized onto the gills, near the first legs. So the crab will die, when not returning immadiatly to clean water.
Although RCC's are coming out of tropic areas, they are sensitive to temperatures,that increases too much.
Neither the water nor the air should be too hot. Best is having both nearly the same temps, just as 22°C - 25°C.
Increases the value to more than 30°C, a circulatory collapse may follow because of an overheating. After a while it will kill the crab. So when it had happened, return the overheated crab just back in cooler space. And even hope, that the damage is not too strong.
While overheating the balance organ can be injured and will never be ok again. Especially in well covered tanks the sun can raise dramatically the temperatures. Create something to shadow the tank, that the crabs could not be harmed by a strong sunshine.
Occasionally crabs are observed which dragging their rear legs behind them. Unfortunately the cause of this RCC-typical behaviour is unknown. But possibly it shows an infectious desease. Thus there's no medical treatment .
Does a crab never appear out of its hiding place, also stays there at night , something's wrong. Especially when this behaviour is shown when the acclimation should be over after one to three weeks.
Maybe the crabs preparing for molting, in this case they also hide way without eating.But if there's no molt after a week you must have look for the circunstances in the crab tank.When these are ok, water clean and warm etc than there must be another problem.
Maybe the crab felt threaten because of crabs of its own kind or other tankmates not beeing crabs.
Some crabs kept alone, without other RCC's, never leaving their hiding too. But not evry alone crab is acting like this, just even what's the individual charactere like. I never made experiences like this, but I think, that mostly young and because of that, small female crabs feeling alone acting this way. Another possibility for afraid crabs is the keeping in the petstores.Mostly too much crabs are living in too small tanks.But I realized when the circumstances in the store is ok, the crabs are not afraid in their new home. That's emotional stress and must be avoided, because the crabs are sensitive to it and may get sick.
My first crab, the female 'Sebastian'( evenlater I was able to difference the sexes) lived alone.I didn't know enough about keeping crabs, but I think later now,one cause of death after four weeks was her lonelyness - maybe.
Once I decided to give the second crab - Kopernikus - a female to end his lonelyness. So I purchased the little lady Kassandra. I took her off the petstoretank, where too many males had already killed the most crabs.I found Kassandra deep hiding under a stone for days. Arriving at her new home she was very hungry and than built a new appartment to hide and wasn't seen again. Suddenly Kopernikus died. I was shocked because at first I wasn't able to see why.Finally I realized that he had eaten the moss I collect outside and there were some small fungus to see.I miss him so much but I did his body in alcohol and so he is sitting ontop of my working desk now.
Just when I removed the dead body,little Kassandra came out the first time. For now she acted not so afraid as the male crab was in the tank at all. I purchased another female, Kopernia, and both were happy together. Has had Kassandra fear because of the male Kopernikus, because she knew males only killing other crabs? At that time she was a very young crab. For now she let the curious frogs inside her home. Before that was not tolerated and she attacked the frogs when coming nearby. Maybe that Kassandra was afraid of males,I think it's possible. ( siehe: Crabs in Aquarium / RCC's home / Take a stroll landward .

Difficulties at molting time - Crabs without legs and claws - Fungus deseases - parasitic growth
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© by Annette Berkelmann
created by Andre Brandt
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