Blue Velvet Damselfish
The Blue Velvet Damselfish, also known as the Japanese Damselfish or the Blue-Streak Devil, is black with small blue stripes and one large white vertical stripe. As it matures, it may lose some of its coloring, fading towards brown and black.
It will do well in a 30 gallon or larger aquarium. It is aggressive toward other fish and prone to disease if proper aquarium management techniques are not practiced.
It feeds on a variety of meaty items, herbivore preparations, and flaked foods.
Size
| Approximate Purchase Size | 1″ to 2-1/2″ |
|---|
FAQ
What is the typical behavior of the Blue Velvet Damselfish in an aquarium?
The Blue Velvet Damselfish is aggressive toward other fish and requires ample space. It should not be kept with peaceful or small species.
What type of food does it prefer?
It feeds on meaty items, herbivore preparations, and flaked foods.
How does its coloration change over time?
As it matures, the Blue Velvet Damselfish may lose its blue stripes and fade toward brown and black.

Michelle Newman –
I kept this fish in a 40-gallon tank with proper hiding spots. It was active and colorful at first, but became more aggressive over time. I had to remove a few smaller fish to avoid conflicts. Feeding it meaty foods worked well.
Natalie Peake –
The fish arrived healthy and showed vibrant colors initially. After a few weeks, the white stripe faded slightly. I’ve noticed it’s not compatible with community fish. Needs a large tank and careful management.
Owen May –
Great for experienced aquarists. The blue and white markings are striking when young. I feed it a mix of frozen and flaked food daily. It’s active and stays in one area, which helps with tank organization.