Nature Field Guide
Giant Damselfish
- Spanish name
- Damisela gigante
- Scientific name
- Microspathodon dorsalis
What Do Pico & Tati Think?
Pico: “This damselfish looks almost black!”
Tati: “Adults and young can look different. Let’s compare their fin edges.”
Species overview
About the Giant Damselfish
Adults are deep-bodied and blue-gray to almost black, with narrow pale fin edges. The forehead lacks a pronounced hump. Young fish can have vivid blue markings.
It uses rocky reefs and eats algae along with small animal food. Juvenile and breeding colors can differ from an ordinary adult, so avoid relying on one color alone.
Identification
Key Features of the Giant Damselfish
Deep dark blue-gray body
Narrow pale fin edges
No pronounced forehead hump
Habitat & range
Pacific rocky reefs and nearby coastal marine habitats. Check the linked species reference for its wider range.
Local observations
Recorded at Cabo Blanco.
When to observe
Visibility depends on water clarity, currents, depth and conditions. No fixed local viewing or migration season is assigned.
Conservation & care
Observe with a qualified guide. Do not feed, chase or handle fish. Keep fins off the reef and take all litter home.
Threats & pressures
Habitat damage and degraded water quality are pressures to prevent in coastal fish habitats. This profile does not quantify a local decline.
Observation activity
Compare a juvenile and an adult photograph. Mark the colors that change.
Explore by location
Guanacaste · Puntarenas & the Gulf Islands · South Pacific · Ocean & Coastal Life