Pajama Cardinalfish, Sphaeramia nematoptera

The Pajama Cardinalfish (Sphaeramia nematoptera) is a fish that belongs to the Apogonidae family. These fish are a popular aquarium fish. The Pajama Cardinalfish can grow to be a length of 3 inches. The fish has red eyes and broad, dark, vertical “waistband” that is sprinkled with red spots that leads toward the tail. This fish has low vulnerability.

Pajama Cardinalfish circulate throughout much of the West Pacific, from Jave to Fiji and from south of the Ryukyu Islands to the Great Barrier Reef. The males of the pajama cardinalfish are mouth brooders.

Pajama Cardinalfish can live many years in a marine aquarium and are considered to be peaceful and hardy. These fish are reef safe since they typically do not bother invertebrates of other fish. Occasionally they may eat small shrimp.

These are social fish and are kept in groups of five or more. Unlike most marine fish they tend to breed in captivity. But only rarely are captive bred specimens available. If the pajama cardinalfish are in captivity with a long spinel sea urchin they will hide behind the spines when they feel as if they are threatened.

Image Credit: Drow Male/Wikipedia (CC BY-SA 3.0)