Acapulco Damselfish (Juvenile)

Pacific Fish ID

Stegastes acapulcoensis

Family: Damselfishes (Pomacentridae)
Size: 2 – 6 cm (1 – 2.5 in)
Depth: 2 – 10m (5 – 33ft)
Distribution: Baja California to Peru.

Identification:
One of the most colorful fish on the shallow reef, looking nothing like its adult parent.

  • Color Pattern: A distinct "half-and-half" look. The head and upper back are electric indigo-blue with neon blue spots. The lower body, belly, and tail are bright lemon yellow.
  • The False Eye: A prominent black spot (ocellus) sits on the dorsal fin, ringed in neon blue. This mimics an eye to confuse predators about which direction the fish is swimming.

Behavior:
Small but fierce.

  • Habitat: You will rarely see them swimming in the open. They hug the bottom, hovering close to protective coral branches or empty barnacle shells.
  • Territory: Even at this tiny size, they are territorial. If you watch closely, you can see them chasing away other small fish from their chosen rock.

You just learned about this fish...

NOW COME SEE IT!

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Behind the Lens

Jalvan

Underwater Photographer & Instructor

Documenting unique marine biodiversity from the Red Sea across the Pacific Ocean. Dedicated to creating a visual catalog of Bahia Solano's marine life for conservation and research.

Photography: Sony A7C II | Olympus EPL10
Video: Osmo Action 5 Pro | GoPro




REFERENCES & DATA SOURCES

  • Scientific ID: Verified via FishBase.
  • Field Guide: Reef Fish Identification: Baja to Panama (Humann & DeLoach).
  • Regional Data: Ankla Azul Marine Observation Log (Bahia Solano).

More Than Kicking Your Fins

At Ankla Azul, diving is more than kicking your fins. It's patient teaching, sharp safety, and real care for the place we call home. As an SSI Instructor Training Center and an SSI Blue Oceans Center (2025 award), we blend skill-building with ocean awareness—Fish ID, coral nursery work, community education, and rescue support—so every dive grows confidence and respect for Bahía Solano's wild Pacific.