Goldline Knifefish
Goldline Knifefish are seldom seen in the aquarium hobby. The Goldline Knifefish, or Yellowline Knifefish, are caught in the Amazon basin near the border of Colombia and Brazil. This makes for a difficult journey to the warehouses of AquariumFish.com! Goldline Knifefish are wild and require some live foods such as black worms or feeder white clouds, but you can transition them to frozen foods. These fish project an electric field to find their prey, but cannot generate enough power to subdue their prey the way the electric eel does (electric eels are technically knife fish). Little is known about the Goldline Knifefish – it is only assumed they grow as big as Black Knifefish. Their temperament is similar, and these fish are compatible with fish that cannot fit in their mouth.
Specifications
| Feature | Detail |
|---|---|
| Species | Goldline Knifefish (Yellowline Knifefish) |
| Habitat | Amazon basin, near Colombia and Brazil |
| Feeding | Live foods (black worms, feeder white clouds); can be transitioned to frozen foods |
| Electric Field | Used to detect prey, not to subdue prey |
| Growth Assumption | Similar to Black Knifefish |
| Temperament | Calm, compatible with fish that cannot fit in their mouth |
FAQ
What kind of food does the Goldline Knifefish require?
Goldline Knifefish require live foods such as black worms or feeder white clouds initially. They can be transitioned to frozen foods over time.
Can Goldline Knifefish generate enough electricity to subdue prey?
No, Goldline Knifefish project an electric field to detect prey but cannot generate enough power to subdue their prey like electric eels.
What is the expected size of a Goldline Knifefish?
It is only assumed that Goldline Knifefish grow as large as Black Knifefish, with no confirmed measurements available.

Robert Lee –
Received my Goldline Knifefish in good condition. The fish was active and seemed healthy after a few days. I started feeding it black worms and switched to frozen food after a week. It’s quiet and doesn’t seem aggressive. Works well in my tank with larger, non-aggressive species.
Maria Thomson –
The fish arrived safely and has been adjusting well. I had to provide live food at first, but after a week it accepted frozen options. It’s a unique addition to the tank and doesn’t interfere with other fish. A bit shy at first but now it’s active.
Alan Sharp –
Great purchase. The Goldline Knifefish is fascinating to watch. It uses its electric field to sense movement in the water. I’ve kept it with peaceful community fish and it’s been peaceful so far. Feeding transition went smoothly after a few days.