Acapulco Damselfish: The Reef's Dusky Defender

Not every reef fish needs bright colors to make an impression — the Acapulco damselfish gets by on pure attitude, guarding its scrap of reef with endless energy. Here's how to spot it near Jacó, plus five fun facts.

Acapulco Damselfish · Stegastes acapulcoensis

How to spot the acapulco damselfish near Jacó

Look among rocks and rubble for a small, dark brown-gray fish that rarely strays far from one spot. Juveniles are a bit brighter, often with blue flecks and a yellowish cast. Watch for the telltale damselfish behavior — darting out to chase off any fish that crosses the line.

5 fun facts about the acapulco damselfish

• Named for Acapulco. The species was first described from the waters off Acapulco, Mexico, giving it its common name.
• A reef gardener. It farms a patch of algae, grazing and tending it like a tiny crop.
• Small but relentless. Despite its size, it defends its territory against fish far larger, all day long.
• Subtle good looks. Adults are plain dusky brown, but catch the light and you'll see soft blue flecks along the body.
• Eastern Pacific only. It's found just along the Pacific coast of the Americas, a common reef resident here.

The acapulco damselfish 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.