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. They can grow up to 1.57" (4 cm).[3] They have a second dorsal fin spine that reaches at least to the base of the third ray of their second dorsal fin when depressed, and they have 14 pectoral fin rays.[4] They usually get about 4 months old.[5]
The Hawaiian ruby cardinalfish is endemic to the Hawaiian islands.[6] These fish are very shy, nocturnal, and prefer to hide in and patrol along holes and crevices.[6]
Apogon erythrinus, also called Hawaiian ruby cardinalfish, is a marine fish species endemic to Hawaii. It belongs to the family Apogonidae and the subfamily Apogoninae.