Do Vampire Crabs Breed More in a Smaller Tank

No. A smaller tank won’t push a vampire crab female into a bigger clutch, so it won’t give you more babies. What changes how many young you raise is cover and separation, because adults eat the young they catch.

How many babies does one vampire crab clutch produce?

One clutch gives up to about 40 crablets. Nothing on record ties the size of the enclosure to how many eggs a female carries, so if you were hoping a smaller box would push her into a bigger clutch, it won’t help you there. If that’s more young than you want, check whether a male and female vampire crab can live without breeding before you pair them.

The vampire crabs sold in the hobby breed in fresh water, and their large eggs hatch straight into tiny crabs with no larval stage.¹ There’s no brackish step to arrange. Once they hatch, the young stay on or under their mother for a short time, then walk off into the same enclosure as the adults. That fresh-water cycle keeps vampire crab breeding simple in a home paludarium.

Do adult vampire crabs eat their babies?

Yes. Adults eat the crablets they catch, and that’s where tank size starts to matter.

In a large, densely planted paludarium, some crablets grow up alongside the adults. Shrinking the tank doesn’t add hiding places, so it won’t add young either.

Moving the crablets, or the adults, to a second container as soon as you spot crablets is the step that raises the most young. If you move adult vampire crabs after the babies appear, the young never have to be handled.

Should you buy a smaller tank to breed vampire crabs?

No. Pick the enclosure for the adults you keep and size it by normal vampire crab care, not by breeding goals.

Adults kept in a group do fight, most often when a dominant male chases or attacks the others, and a crab can lose anything from one leg to both claws and several legs that way. Give the group enough hides that every crab can be out of sight at once. That includes a berried female, who carries her eggs for about three to seven weeks and spends most of that time dug in or tucked into a burrow. If one crab keeps getting chased into the open, add more cover or split the group.

Planning a breeding group? You choose male or female on each product page for our vampire crab lines. Everything in our catalog is bred or propagated in our own tanks rather than collected from the wild. We don’t promise breeding or a number of young from any order, since that comes down to the crabs and the tank they live in.