Starfish Can Regenerate Entire Bodies

The incredible power of regeneration in certain sea stars is a marvel of biology, turning a potentially fatal injury into a form of asexual reproduction. The secret lies in the central disc, the starfish's main body cavity that houses its vital organs. If a severed arm retains even a small portion of this central hub, it possesses the necessary genetic blueprint and undifferentiated stem cells to begin the slow, methodical process of rebuilding an entire new body. This is no quick fix; the complete regeneration of a new sea star from a single limb can take a full year to complete.

This regenerative capacity has famously backfired on humans. In the past, oyster fishermen, viewing starfish as pests that preyed on their beds, would chop them in half and throw the pieces back into the ocean. To their dismay, they were not killing the creatures but inadvertently doubling their population. A similar challenge exists today with the invasive crown-of-thorns starfish. Its voracious appetite for coral (Deals) makes it a major threat to reef ecosystems, and its advanced ability to regenerate from even small fragments means that physical removal efforts must be done with extreme care to avoid accidentally propagating the problem.