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Reef spotting guide · Hanauma Bay

Hanauma Bay Fish Guide

You do not need to memorize dozens of names. Start with body shape, color pattern and where a fish is feeding, then use this guide to recognize some of Hanauma Bay’s most memorable reef residents.

Start the Fish GuideMarine Life Guide
? Based on Hawai’i Sea Grant? Easy visual clues? Look, never feed
Best clueShape + patternColor alone can change
Where to lookReef edgesFish gather around habitat transitions
VisibilityOften best earlyBefore sediment is stirred up
RuleNever feed fishObserve natural behavior
A practical ID guide

Fish You Can Learn to Spot

Hawai’i Sea Grant’s Hanauma Bay Interactive Reef documents many of the animals visitors may see. The list below focuses on fish with strong visual clues that are useful to casual snorkelers.

Manini, or convict tang, with bold black vertical bars
Acanthurus triostegus
Manini

Convict Tang

Pale body with bold dark vertical bars. Manini often graze algae across shallow reef flats and may move in schools.

Look for: five dark body bars and an oval surgeonfish shape.
Colorful spectacled parrotfish, an example of an uhu species
Chlorurus perspicillatus
Uhu

Parrotfish

Large reef grazers with beak-like teeth. Colors vary by species, sex and life phase; this photo shows a spectacled parrotfish.

Look for: a heavy body, fused beak and bright blue-green patterning.
Kihikihi, or Moorish idol, with black white and yellow bands and a long dorsal streamer
Zanclus cornutus
Kihikihi

Moorish Idol

A deep, triangular fish marked with black, white and yellow bands. The long white dorsal streamer is its clearest feature.

Look for: a tall disk-shaped body and ribbon-like dorsal filament.
Lauipala yellow tang swimming above coral
Zebrasoma flavescens
Lau’ipala

Yellow Tang

A bright yellow, oval surgeonfish with a pointed snout and a small white spine near the base of the tail.

Look for: an almost solid yellow body that stands out above dark reef.
Reef triggerfish with angular body and geometric markings
Rhinecanthus rectangulus
Humuhumunukunukuapua’a

Reef Triggerfish

An angular fish with strong black, white and tan markings and a narrow mouth. Nesting fish can defend their area.

Look for: a wedge-shaped body, dark face band and bold diagonal lines.
Male spotted boxfish with blue body and yellow spots
Ostracion meleagris
Moa

Spotted Boxfish

A rigid, box-shaped fish covered in spots. Adult males and females can look very different, so shape is often the best clue.

Look for: a small mouth, armored box-like body and dotted pattern.
Moano manybar goatfish with broad pale body band
Parupeneus multifasciatus
Moano

Manybar Goatfish

A bottom-searching fish that may appear gray, reddish or purple. Goatfish use chin barbels to probe sand and reef crevices.

Look for: two broad body bars and whisker-like barbels beneath the chin.
Kole goldring surgeonfish with fine blue lines and yellow ring around the eye
Ctenochaetus strigosus
Kole

Goldring Surgeonfish

A dark Hawaiian surgeonfish with fine horizontal lines and a bright yellow ring around the eye.

Look for: the yellow eye ring, bristle-like mouth and many thin body lines.
Keeltail needlefish swimming just below the water surface
Platybelone argalus
‘Aha

Keeltail Needlefish

A very long, pencil-thin surface fish with narrow jaws. It can be easy to miss because its silver-green body blends with rippled water.

Look for: a straight slender body and an extended beak near the surface.
Puhi whitemouth moray eel resting between coral heads
Gymnothorax meleagris
Puhi

Moray Eel

Morays usually keep most of their long body inside reef holes. Repeated mouth opening helps move water across the gills.

Look for: a patterned head emerging from a crevice; keep hands away.
Use photos as a starting point. These are representative identification images and were not necessarily photographed at Hanauma Bay. Fish can change color and pattern with age, sex, life phase, lighting and depth, so identify shape and behavior as well as color.
Fish image credits and licenses

Manini: Brian Gratwicke, Wikimedia Commons, CC BY 2.0.

Uhu example: Dr. Dwayne Meadows / NOAA, Wikimedia Commons, public domain.

Kihikihi: Leonard Low, Wikimedia Commons, CC BY 2.0.

Lau’ipala: Kevin Lino / NOAA Photo Library, Wikimedia Commons, CC BY 2.0.

Reef triggerfish: Brian Gratwicke, Wikimedia Commons, CC BY 2.0.

Moa: Bernard DUPONT, Wikimedia Commons, CC BY-SA 2.0.

Moano: Bryan Harry / National Park Service, Wikimedia Commons, public domain.

Kole: NasserHalaweh, Wikimedia Commons, CC BY-SA 4.0.

‘Aha: Paul Harrison, Wikimedia Commons, CC BY-SA 4.0.

Puhi: Brocken Inaglory, Wikimedia Commons, CC BY-SA 3.0.

Images were cropped and optimized for this guide. Each image remains available under the license stated above.

How to Identify Fish Faster

1. Body Shape

  • Oval tang or surgeonfish
  • Long needlefish or trumpetfish
  • Box-shaped boxfish
  • Deep triangular Moorish idol

2. Pattern

  • Vertical convict-tang bars
  • Yellow tang’s solid color
  • Triggerfish geometric markings
  • Boxfish spots

3. Behavior

  • Algae grazing
  • Schooling over reef
  • Bottom searching
  • Hiding in crevices

Where Fish Gather

Hanauma Bay reef habitat and sandy channels

Reef edges are productive

DLNR notes abundant fish along reef edges around sandy-bottomed areas. The shallow reef flat extends offshore with several large sandy openings, creating easy-to-read habitat boundaries.

Look along the edge without drifting onto shallow coral. Fish may also use the sand, surface water and reef crevices depending on species.

Learn Families, Not Just Species

Once you recognize the major reef-fish families, individual species become easier. Hawai’i’s Marine Life Conservation Districts support many wrasses, butterflyfishes, tangs and surgeonfishes. At Hanauma Bay, the protected setting also allows visitors to observe natural feeding and schooling behavior at close range without fishing pressure.

W
WrassesOften active, colorful swimmers moving over reef and sand. Hawai’i has many wrasse species.
B
ButterflyfishFlat, disk-like bodies with precise patterns; many species forage around coral and reef structure.
T
Tangs and SurgeonfishOval bodies with tail-base spines. Many are important algae grazers.
G
GoatfishBottom-oriented fish with sensory barbels under the chin for finding prey in sand and rubble.

Best Time for Fish Watching

DLNR says underwater visibility is usually best at low tide and early in the day, before sediment is kicked up by snorkelers. Morning conditions can also be favorable for snorkeling, though ocean conditions always matter more than the clock.

Slow down. Many fish become easier to notice when you stop swimming, float quietly and watch the same patch of reef for 20 to 30 seconds.

Watch Natural Behavior

Do not feed fish to bring them closer. Feeding or attracting marine life is prohibited in the Hanauma Bay Marine Life Conservation District. Do not touch fish, coral, eels or other animals, and do not collect anything from the reef.

Hanauma Bay shoreline and reef

Use the official educational resources

Hawai’i Sea Grant publishes a 65-page waterproof Snorkeler’s Guide to the Fishes of Hanauma Bay and an interactive reef with species profiles.

For families, Sea Grant also offers a printable Hanauma keiki field guide for observing marine life and the natural environment.

FAQs

What fish are easiest to recognize at Hanauma Bay?

Manini (convict tang), yellow tangs, Moorish idols, parrotfish, triggerfish and boxfish all have strong shape or pattern clues that make them useful starting points.

Where should I look for fish?

DLNR notes abundant fish around reef edges surrounding sandy-bottomed areas. Stay within safe depth and avoid standing on or kicking coral.

When is visibility best?

DLNR says visibility is usually best at low tide and early in the day before sediment is stirred up by snorkelers.

Can I feed fish so they come closer?

No. Introducing food or another substance to feed or attract marine life is prohibited in the Hanauma Bay Marine Life Conservation District.

Is there an official fish guide?

Hawai’i Sea Grant publishes a waterproof Snorkeler’s Guide to the Fishes of Hanauma Bay and an online interactive reef.

Source Notes

Species descriptions are based on the Hanauma Bay Interactive Reef and Hawai’i Sea Grant fish guide. Habitat and visibility guidance comes from Hawai’i DLNR.

Keep Exploring

Sea TurtlesLearn responsible honu viewing.Marine LifeGo beyond fish to reef habitat and invertebrates.SnorkelingChoose safe areas and enter the water carefully.