Convict Tang: The Reef's Striped Grazing Crew

The convict tang is a small, silvery surgeonfish wearing six dark 'prison' bars — hence the name. They graze algae off the rocks in busy, roving groups, and they're a common, cheerful sight in our cove. Here's how to spot them near Jacó, plus five fun facts.

Convict Tang · Acanthurus triostegus

How to spot the convict tang near Jacó

Watch for small silver fish with bold black vertical bars, usually feeding in groups along the rocks. Convict tangs move together in numbers, grazing as they go, so where you find one you'll usually find many.

5 fun facts about the convict tang

• Named for the 'prison stripes'. Six dark vertical bars across a silvery body give the convict tang its unmistakable, well, convict look.
• A champion traveler as a baby. Its larvae drift in the open ocean for weeks before settling, which is why it's found across a huge range of the Pacific.
• Strength in numbers. Convict tangs often feed in large, roving schools that can overwhelm territorial fish guarding a prized patch of algae.
• A surgeon's spine, too. Like all surgeonfish, it carries a sharp spine near the tail — one more reason to look, not touch.
• A reef gardener. By constantly cropping algae off the rocks, it helps keep the reef clean and in balance.

The convict tang is just one of many characters down there. See the whole cast in our Snorkel Jaco fish directory, or read real guest photos and reviews on the Snorkel Jaco reviews.