Hawaii's reefs are some of the most accessible in the world — warm, clear water and an abundance of marine life make it the perfect place for your first (or hundredth) snorkeling trip. Here are the ten species you're most likely to spot, and how to identify them.
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Reef Triggerfish (Humuhumunukunukuapua'a)
Hawaii's state fish is hard to miss — and even harder to pronounce. Look for the distinctive angular body with blue and gold lines, and a dark stripe running from the eyes to the tail. They're territorial and often found in shallow, rocky areas.
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Yellow Tang
Unmistakable in their electric yellow, these disc-shaped fish travel in schools across the reef. They're herbivores, spending most of their time grazing on algae. Especially common on the Big Island's Kona coast.
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Moorish Idol
With their trailing white dorsal fin and bold black-yellow-white banding, Moorish Idols look like they belong in an art gallery. They're often confused with Bannerfish, but the Moorish Idol's elongated dorsal streamer and orange "saddle" on the snout are the giveaway.
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Green Sea Turtle (Honu)
Not a fish, but easily the most beloved creature on the reef. Hawaiian Green Sea Turtles are protected under federal law, so keep a respectful distance (at least 10 feet). You'll find them grazing on algae in shallow bays or resting on sandy bottoms.
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Parrotfish (Uhu)
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Named for their fused, beak-like teeth, Parrotfish chomp on coral and excrete fine sand — they're literally making Hawaii's beaches. Their colors shift dramatically as they mature, ranging from drab brown to vivid blue-green.
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Butterflyfish
Hawaii is home to several Butterflyfish species, including some found nowhere else on Earth. Look for the Raccoon Butterflyfish (black mask over the eyes) and the Ornate Butterflyfish (diagonal orange stripes). They're usually in pairs.
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Spotted Eagle Ray
These graceful rays "fly" through the water with slow, powerful wingbeats. Their dark dorsal side is covered in white spots, making them easy to identify. They're most often seen cruising sandy channels between reef sections.
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Achilles Tang
A sleek, dark-bodied tang with a signature orange teardrop marking near the tail. They prefer areas with strong wave action and are more common on the windward sides of the islands. A true trophy sighting for fish-spotters.
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Convict Tang (Manini)
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Named for their vertical black stripes on a pale body, Convict Tangs are one of the most abundant reef fish in Hawaii. They school in large numbers and are a great "starter fish" to practice your identification skills on.
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Snowflake Moray Eel
Peek into reef crevices and you might spot the blunt, patterned face of a Snowflake Moray poking out. Despite their fearsome look, they're shy and non-aggressive. Their mottled black-and-white pattern gives them their name.
Tips for Snorkeling Hawaii's Reefs
Go early. Morning hours mean calmer water, better visibility, and fewer crowds. Many fish are most active during the first few hours of daylight.
Wear reef-safe sunscreen. Hawaii law bans sunscreens containing oxybenzone and octinoxate, which damage coral. Look for mineral-based (zinc oxide) formulas.
Don't touch or stand on the reef. Coral is alive and fragile. Even a light touch can damage years of growth. Use a flotation device if you need to rest instead of standing.
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