The Curaçao sponge that survived 2,300 years in the Caribbean

When this sponge began growing on a reef in Curaçao, the Roman Empire did not yet exist. Anchored to one spot on the seabed, the animal endured wars, empires and climate changes while carrying out one quiet daily task: pumping and filtering the water around it.

Which animal survived 23 centuries in the Caribbean?

This remarkable resident was a giant barrel sponge, Xestospongia muta. Photographed in Curaçao, the specimen was about 2.5 metres across and was estimated to be roughly 2,300 years old, placing it among the longest-lived animals ever recorded.

Often called the “sequoia of the reef”, the species earned this nickname because of its exceptional size and longevity. Like other adult sponges, it remains attached to the substrate. This individual stayed in almost exactly the same position after settling on the reef as a microscopic larva.

How can a giant barrel sponge live for so long?

Although it resembles a huge vase, a sponge is an animal. It has no brain, heart or nervous system, yet its body contains thousands of pores, channels and specialised cells that work together to move water, collect food and keep the organism alive.

This basic structure belongs to a very ancient branch of animal life. Its survival does not rely on fast movement or complex organs. By staying fixed to the reef, the sponge conserves energy and maintains a steady relationship with currents carrying oxygen and nutritious particles.

What did it do every day?

Water entered through tiny pores distributed across its body and travelled through an internal network of channels. Along the way, specialised cells removed bacteria, plankton and organic matter. The water was then released through a large opening at the top, known as the osculum. This process also benefits the surrounding environment.

• It collected microscopic particles suspended in seawater.
• It recycled nutrients essential to the reef's functioning.
• It helped link open water with organisms on the seabed.
• It provided shelter for small animals living on its surface.

Estimates published for a specimen of this size indicate filtration of nearly 1,000 gallons, or around 3,800 litres, each day. At that rate, the total volume filtered over 2,300 years could reach hundreds of millions of gallons. This is an approximation rather than a continuous measurement.

Watch the video shared by the Pawlik Lab YouTube channel, showing several giant barrel sponge species in the Caribbean.

How did scientists estimate its age?

Sponges do not produce annual rings like trees. To estimate their age, researchers compared photographs taken over time, measured the animals and applied mathematical growth models. A study published in the journal Marine Biology in 2008 showed that the species' growth rate varies considerably.

The Curaçao specimen's measurements were then entered into these models, resulting in an estimate of approximately 2,300 years. Scientists themselves caution that calculations involving such large individuals carry uncertainty. Academic records also indicate that the sponge died in 1997 during an episode linked to disease, rather than simply from old age.

Why does this story demand attention now?

The sponge's longevity demonstrates that a reef can hold stories that predate human records by a vast margin. For centuries, this animal filtered water, recycled nutrients and created space for other life forms. Its death is a reminder, however, that even millennia-old organisms are not safe from disease and environmental change.

Learning about these silent giants should inspire more than curiosity. Reefs are changing now, and protecting their water, diversity and organisms is an urgent task. By valuing marine conservation today, we help safeguard animals that may still be alive when our own time has become history.