Twinspot Cardinalfish find shelter

Twinspot Cardinalfish find shelter during daylight hours. They hover in small groups among dense hard corals.

Identifying the Twinspot Cardinalfish

The Twinspot Cardinalfish gets its scientific name from two dark spots on its body. That name is Taeniamia biguttata. One spot is behind the head. The second spot is on the mid-tail base. The fish seems to darken or lighten its tail spot. Also, this cardinalfish has a dark bar below the eye. This dark bar distinguishes this species from others at times when the second spot on the tail is diffuse. These features help separate it from similar species.

As with many cardinalfish, the Twinspot’s body is pale and slightly transparent. Rows of narrow orange bars decorate it. And tiny dashes of bright yellow mark the mouth and eyes. Most remarkable in the Twinspot Cardinalfish found in Gorontalo are the electric blue markings on its eyes. This striking feature does not appear in other photographs of Taeniamia biguttata. Fishes of Gorontalo often appear more colorful than the same species found elsewhere.

Sheltering in Gorontalo’s hard corals

Schools of Twinspot Cardinalfish typically shelter among dense branching corals during the day. Only careful divers will notice them. Usually, they hover in place. They will only move when approached. Often, they will move as a school. Notice this behavior in our video.

Still photographs taken of these Twinspot Cardinalfish were carefully animated using AI. Notice which individual fish display the tail spot and which do not. Several other cardinalfish of different species have joined these schools.

Behavior & Feeding

Cardinalfish species rely on the group for safety. By staying close together, they reduce the chance of being eaten by predators. Their pale color also helps them blend into the background.

If disturbed, the group will move deeper into cover. They do not swim fast over long distances. Instead, they depend on hiding.

Twinspot Cardinalfish are active at night. In darkness, they leave their shelter to feed on plankton in the water. The eyes are large, which helps the fish see in low light. Most individuals are only a few centimeters long.

This species is found across the Indo-Pacific from Indonesia’s Sumatra to Japan. It prefers protected reef areas, especially places with overhangs or branching coral. Groups can be small or quite dense.

If you would like one of our dive masters to point out cardinalfish, please let him know. For bookings, please contact us.