Maui Sea Cucumbers Guide: What Loli Are And Why Reefs Need Them

If you’ve ever been snorkeling in Maui and spotted what looks like a squishy loaf of bread glued to the reef, congratulations. You may have just met a sea cucumber. In Hawaiʻi, you’ll often hear them called loli.

They’re not flashy like a parrotfish, and they don’t pose for photos like turtles. But sea cucumbers are quietly doing important reef work every day. Think of them as the ocean’s tidy little cleanup crew, just with way more squish.

What Is A Sea Cucumber

Sea cucumbers are marine animals that live on the seafloor. They’re related to echinoderms, which also include sea stars and sea urchins. Many species spend their lives moving slowly along sand and rock, feeding on organic material.

What Does “Loli” Mean In Hawaiʻi

Loli is a Hawaiian name used for sea cucumbers. You might also hear it used for specific types depending on location and tradition. Either way, if someone points at a sea cucumber and says “loli,” now you know you’re not being offered dessert.

Common Loli You Might See In Hawaiʻi

Hawaiʻi’s shallow waters have more than 14 species of sea cucumbers. Some of the better-known kinds include:

• Black sea cucumber (Holothuria atra)
• Ashy sea cucumber (Holothuria cinerascens)
• Banded sea cucumber (Holothuria pervicax)
• White-speckled sea cucumber (Actinopyga mauritiana)

Why Reefs Need Them

Sea cucumbers are detritivores, which means they feed on organic material in reef sediment. As they process sand and debris, they help recycle nutrients and turn over sediments. More recent reef research also suggests that losing detritivore sea cucumbers can worsen coral disease, which makes these “squishy reef janitors” more important than they look.

The Snorkeler Version

• They help clean up the reef environment
• They support nutrient cycling
• They’re a sign you’re looking at a living ecosystem, not just pretty rocks

Where You Might See Sea Cucumbers In Maui

You’ll often spot sea cucumbers in:

• Shallow reef flats
• Rocky areas with sandy pockets
• Tide pools and calm protected bays

They’re most noticeable when you slow down and actually look at the bottom instead of sprint-snorkeling like you’re late for a meeting.

Are They Dangerous

Generally, no. The bigger issue is what happens when humans treat them like toys. Some species can release defensive chemicals when stressed, and handling marine life is never a great idea.

So Here’s The Rule

Don’t touch them. Don’t pick them up. Don’t poke them. Don’t “just see what happens.” Maui doesn’t need your science experiment.

Fun Facts About Sea Cucumbers

• They can look like rocks, sausages, or sea potatoes depending on the species.
• Some have wild defense mechanisms that are impressive and also extremely not your business.
• They’re one of those animals that make you realize the ocean is basically an alien planet, in the best way.

How To Snorkel Responsibly Around Loli

• Look, don’t touch: the reef is not a petting zoo.
• Watch your fins: don’t kick up sand or scrape the bottom.
• Stay off the reef: don’t stand on coral or reef rock.

Learn more about reef-safe behavior in our How To Visit Maui Responsibly In 2026 guide.

Final Thoughts

Sea cucumbers might not be the stars of your Maui snorkeling photo album, but they’re absolutely part of what keeps reef ecosystems functioning. Next time you see a loli, give it a little respectful nod and let it keep doing its job. It’s earned it.