Crabs

[fish tamer]

are than any true freshwater crabs that wont need brachish water. and can just can stay underwater with no problems:confused:

[Pyramid_Party]

None that Ive heard of, but there is some land crabs. But I think they even need some access to some water, and the water is usually brackish.

[synodontisjack]

there are crabs that do great in freshwater but they all need a land area.

[fish tamer]

why do crabs need to breath air

[kydsexy]

^^^ is that a serious question? if so, i will respond after the gym.

[Veneer]

Yes, there are many true freshwater crabs ... including fully aquatic species that don't need land access. They show up less regularly than red-claws (one or a few species of SE Asian Sesarmids) and fiddlers (Uca spp.), both of which can tolerate freshwater but really need brackish and semi-aquatic conditions for long-term survival.

Here's one such fully aquatic freshwater species, Potamonautes orbitospinus, the Malawi blue crab (from Lake Malawi, of course):

http://crusta10.de/templates/images/galerie/pictures/142/crusta10_142_Potamonautus%20orbitospinus.jpg

Cardisoma spp. like this C. armatum (rainbow, Halloween, patriot, moon crabs) live in freshwater, but do best with a land area:

http://aquascope.ru/modules/wfsection/images/article/1/cardisoma_armatum.jpg

See this page (http://aqualandpetsplus.com/Bug,%20Mini-Crab%20I.htm) for the species you'll most likely encounter in stores.

[invisyblegypsey]

a blue crab will live in fresh water