Yellowtail Demoiselle [A Beginner’s Guide]

Yellowtail Demoiselle Featured Image

Yellowtail Demoiselle, also known by its scientific name Neopomacentrus azysron, is a type of damselfish found in the Indo-West Pacific region.

Sometimes, it’s available for purchase in the aquarium trade.

This fish usually lives in outer reef slopes. It often resides deeper down in surge channels or ledges nearby.

Yellowtail Demoiselle forms small groups in underwater habitats. This fish is active during the day and reef-safe since it doesn’t harm coral or other tank inhabitants.

You can check out what this fish looks like over here.

Yellowtail Demoiselle Interesting Facts

  • Yellowtail Demoiselle has a unique mating process. These fish form distinct pairs during breeding.
  • Males guard and aerate the eggs, which stick to underwater surfaces like rocks or plants.
  • This fish thrives in tropical waters from East Africa to the Indo-Malayan Archipelago and beyond.
  • With a maximum length of 2.9 inches (7.5 centimeters), it has an all-yellow anal fin that sets it apart from similar species.

Yellowtail Demoiselle Habitat

Yellowtail Demoiselle is found in the Indo-West Pacific region.

Its habitat stretches from East Africa to places like the Indo-Malayan Archipelago, Taiwan, Vanuatu, northern Australia, New Guinea, and the Solomon Islands.

This fish lives in marine environments near reefs and doesn’t migrate. It’s found at depths of 1 to 12 meters.

Yellowtail Demoiselle thrives in tropical waters with latitudes between 22°N to 18°S.

Water Temperature:Unknown
Water pH:Unknown
Water Hardness:Unknown

Yellowtail Demoiselle Physical Characteristics

Size: 2.9 inches (7.5 centimeters)

Yellowtail Demoiselle grows up to 2.9 inches (7.5 centimeters) long. It has 13 dorsal spines, 11 to 12 dorsal soft rays, 2 anal spines, and 11 to 12 anal soft rays.

Its body is gray with a bluish tint from its scales and blue streaks.

It also has a dark ear spot, a small black spot on the base of its pectoral fin, and a yellow tail that extends to the back part of its dorsal fin.

What sets it apart from similar species is its all-yellow anal fin.

The body depth measures about 2.5 to 2.8 times the standard length of the fish.

Yellowtail Demoiselle Reproduction

Yellowtail Demoiselle lays eggs, called oviparous. When it’s time for breeding, these fish form distinct pairs.

The eggs are demersal, meaning they sink to the bottom and stick to surfaces like rocks or plants.

Male Yellowtail Demoiselle fish guard the eggs and help supply them with oxygen by fanning water over them.

Yellowtail Demoiselle Scientific Classification

Scientific Name:Neopomacentrus azysron
Also Known As:Yellowtail Demoiselle
Conservation Status:Unknown

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