The regeneration can start right away, and you
will see a little bud where the old arm was. But
it can take several months to a year for the
arm to be normal-sized. Limbs regenerate
faster when the starfish is healthy and finding
enough good food. If conditions are bad, the
regeneration will take longer.
There is no reason they could not regenerate
limbs in a lab, but it takes some effort to keep a
good marine aquarium.
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