Apogon erythrinus,[1] also called Hawaiian ruby cardinalfish, is a marine fish species endemic to Hawaii.

It belongs to the family Apogonidae and the subfamily Apogoninae.

[2] The Hawaiian ruby cardinalfish is a relatively small red fish with a somewhat transparent appearance.

[6] These fish are very shy, nocturnal, and prefer to hide in and patrol along holes and crevices.

This order Gobiiformes (goby) related article is a stub.