Hawaii Reef Fish Guide
Dartfishes
Dartfishes are shy, slender reef fish that hover above sandy or rubble-bottomed areas and quickly retreat into burrows when approached. In Hawaii, the Fire Dartfish and Indigo Dartfish are the two species found in local waters.
Small Reef Fish That Hover Near Burrows
Dartfishes are slender reef fish with two dorsal fins and a quick, darting style of movement. They often live near sandy or rubble-bottomed areas close to reefs. Because they are shy, they usually stay near shelter and retreat fast when something comes too close. Visitors can browse the broader Hawaii fish guide for more reef fish and marine animal profiles.
Two species of dartfishes live in Hawaiian waters: the Fire Dartfish and the Indigo Dartfish. The Fire Dartfish is especially eye-catching because of its pale front, bright orange-red tail and graceful body shape. For more reef background, see the Hawaiian coral reef and the broader Hawaii ocean life guide.
Quick Reef Fish Facts
- Family: Ptereleotridae
- Hawaii species: Fire Dartfish and Indigo Dartfish
- Body shape: Slender, elongated and streamlined
- Key feature: Two dorsal fins
- Habitat: Sand- and rubble-bottomed areas near reefs
- Diet: Plankton
- Behavior: Hovers above the bottom and hides quickly in burrows
Where to See Them in Hawaii
Dartfishes usually hover just above sand, rubble or open patches near reef structure. They often choose areas where they can feed in the current while staying close to a burrow or hiding place. As a result, careful observation works better than swimming directly toward them.
Snorkelers and divers may spot them near reef edges, sandy channels and rubble slopes. However, a quick approach can make them vanish into the bottom almost instantly. Visitors planning reef time can also review Hawaii snorkeling, Hawaii beach safety tips and guided options such as Oahu snorkeling tours, Maui snorkeling tours, Kauai snorkeling tours and Big Island snorkeling tours.
How to Identify Dartfishes
These fish have a slim, elegant body and a hovering posture. They may pause in the water column, then dart quickly back to shelter. The Fire Dartfish often stands out because of its bright tail colors, while the Indigo Dartfish has a more subtle look.
- Look for small, slender fish hovering above sand or rubble.
- Watch for a quick retreat into a burrow when approached.
- Notice the two dorsal fins.
- Check reef edges and open sandy patches near shelter.
Feeding Behavior
Dartfishes feed mainly on plankton. They hover in place and pick tiny drifting animals from the water. This feeding style lets them take advantage of currents while remaining close to their burrows.
Because they feed in open water above the bottom, they need quick escape routes. Therefore, burrows and nearby crevices are important parts of their habitat. Other small reef fish and bottom-associated groups to compare include blennies, wrasses, hawkfishes and damselfishes.
Viewing Tips
Move slowly if you want to watch dartfishes. Stop at a distance and let them settle back into position. If they hide, wait quietly; sometimes they return to the burrow entrance after the perceived threat passes.
With their shy behavior, plankton-feeding habits and quick retreats, dartfishes add a delicate and interesting presence to Hawaii's sandy reef habitats. Visitors interested in reef and shoreline habitats can also read about Hawaii beach sand composition, marine debris in the Hawaiian Islands and related bottom-dwelling animals such as goatfishes, bonefishes and crabs.