How do you think they got where they are? You think the Tooth Fairy brings them? Every living thing on the planet reproduces. It's how the species survives.
Spider crabs reproduce sexually, the same as normal crabs
Hermit crabs use meiosis to reproduce
Yes! Crabs reproduce by laying eggs.
Not in captivity..
they have to be about 10-20.
Actually, you can't make your crabs have babies in captivity, they can only reproduce in the wild because they lay their eggs in the ocean.
Chritmas Island red crabs migrate to the shore to reproduce.
yes they are whatever you want them to be.
More likely the opposite, the crab will eat/kill your dragon fish. Plus fiddler crabs do not often reproduce in captivity.
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If blue crabs didn't have both makes and females they would not be able to reproduce, would they?
If you plan on making your crabs mate, you're out of luck because they only reproduce in the wild. They can become friends with each other in captivity. They can get as big as a baseball, but fear not, because not all crabs even grow that big.