Blue Gudgeon Dartfish
The Blue Gudgeon Dartfish, commonly referred to as the Blacktail Goby or Blacktail Dartfish, originates from the reefs of Fiji. They have an elongated body, which is pale blue or green in color with a prominent black spot on their tail. They enjoy being in pairs and make a wonderful fish for a fish-only or reef aquarium.
It should be housed in a 30-gallon or larger aquarium with plenty of loose coral rubble and requires ample swimming room with a sand bottom for burrowing. A tight-fitting lid is required as they may attempt to jump out of the aquarium or through small openings. Rarely will it become aggressive towards other fish.
Feeds mostly on prey suspended in the water column, and will also pick food off the substrate. A varied diet including live or frozen foods is recommended.
| Specifications |
|---|
| Species: Blue Gudgeon Dartfish (Blacktail Goby) |
| Origin: Fiji reefs |
| Size: Elongated body, up to 4 inches |
| Color: Pale blue or green with black tail spot |
| Temperament: Peaceful, social in pairs |
| Minimum Tank Size: 30 gallons |
| Substrate: Sand bottom for burrowing |
| Water Conditions: Stable, well-maintained reef or fish-only setup |
FAQ
What is the ideal tank size for a Blue Gudgeon Dartfish?
A 30-gallon or larger aquarium is recommended to provide enough swimming room and space for burrowing.
Is the Blue Gudgeon Dartfish aggressive toward other fish?
Rarely. It is generally peaceful and only becomes slightly active when feeding or during movement.
What kind of substrate and decorations does it need?
A sand bottom is essential for burrowing. Include loose coral rubble to provide natural hiding spots and enrichment.
Rebecca Chapman –
Added a pair of Blue Gudgeon Dartfish to my 40-gallon reef tank. They are active and peaceful, often hiding in the sand or darting through the rubble. The black tail spot is very noticeable. They seem to enjoy the water column feeding and don’t stress other fish. Only issue is they tried to jump once—had to install a secure lid immediately.
Jonathan Gray –
These dartfish are beautiful and calm. I kept them in a 35-gallon tank with sand and coral rubble. They pair well and spend most of their time near the substrate. Feeding them with brine shrimp and mysis works well. A tight lid is a must, though.
Heather Reid –
First time keeping a goby species. The Blue Gudgeon Dartfish is exactly as described—pale blue with a black tail spot. They are active but not aggressive. I’ve had them for three months and they’re thriving in my reef setup with plenty of sand and rubble.