Blueline Demoiselle is a type of damselfish found in the Indian and western Pacific Oceans.
As adults, these fish live around rocks and rubble in sandy areas with steep outer reef slopes.
They also live in areas with coral, algae, and rubble on deep slopes. Blueline Demoiselle fish usually stay in small groups near the bottom of the ocean.
They mainly eat tiny crustaceans called copepods. These fish are active during the day and are safe for coral reefs.
You can check out what this fish looks like over here.
Blueline Demoiselle Interesting Facts
- Blueline Demoiselle inhabits the Indian and western Pacific oceans, thriving in reef environments at depths of 20 to 65 meters.
- These fish display a striking neon blue stripe on their body and grow up to 2.4 inches (6.0 centimeters) long.
- They mainly feed on tiny crustaceans called copepods and form distinct breeding pairs during reproduction.
Blueline Demoiselle Habitat
Blueline Demoiselle is found in the Indo-West Pacific region, including places like the Eastern Indian Ocean (Rowely Shoals), New Guinea, Coral Sea, Solomon Islands, Fiji, Samoa, Guam, and the Ryukyu Islands.
It’s also present in Australia (Rowely Shoals) but not on most coastal reefs of the Indo-Australian area.
Blueline Demoiselle lives in marine environments near reefs.
It doesn’t migrate and is found at depths of 20 to 65 meters. This tropical fish is usually located between 30°N to 18°S latitude.
Blueline Demoiselle Physical Characteristics
Size: 2.4 inches (6.0 centimeters)
Blueline Demoiselle grows up to 2.4 inches (6.0 centimeters) long. This fish has 14 dorsal spines, 11 to 13 dorsal soft rays, 2 anal spines, and 13 to 14 anal soft rays.
This fish’s body and fins are pale yellow, while its head and front part of the body are bluish.
It has a wide neon blue stripe with deep blue edges that starts from its snout and goes across its back until it reaches the rear part of the dorsal fin.
The body depth is about 2.3 to 2.7 times smaller than its length.
Blueline Demoiselle Reproduction
Blueline Demoiselle reproduces by laying eggs (oviparous) and forms distinct pairs during breeding.
The eggs stick to surfaces underwater, and the male fish takes care of them, guarding and providing oxygen for proper development.