Yellow Finned Hillstream Loach (Gastromyzon viriosus)
To protect our animals and ensure they get to our customers healthy, we will only ship orders with Nano Fish via UPS Next Day Air.
The Yellow Finned Hillstream Loach is a fairly newly discovered fish species. What makes this fish unique is its striking yellow fins, which stand out prominently against dark substrates and backgrounds. This species is not commonly available in the market, and we are pleased to offer it to our customers. It is naturally adapted to fast-moving streams and helps control algae in aquariums. Some fish in the order are juveniles and may not display full adult coloration. The yellow fins will become more vivid as the fish matures.
| Species | Gastromyzon viriosus |
|---|---|
| Habitat | Fast-moving streams |
| Behavior | Algae control, active swimming |
| Color Development | Yellow fins develop with age |
FAQ
Are the fish shipped in a live condition?
Yes, all fish are shipped live and transported under optimal conditions to ensure their health upon arrival.
Do the yellow fins appear immediately in juvenile fish?
No, juvenile fish may not show full adult coloration. The yellow fins become more prominent as the fish ages.
What kind of water conditions do these fish prefer?
Please contact customer service



Ian Lambert –
Received my Yellow Finned Hillstream Loach and it’s already active in the tank. The yellow fins are subtle now but I expect them to brighten as it grows. The fish seems healthy and is helping with algae control in the stream setup.
Deirdre Burgess –
First time getting a rare hillstream loach. The fish arrived safely and is swimming well. I noticed the fins are still light yellow, but I’m hopeful they’ll deepen over time. Good choice for a unique aquarium addition.
Emily Poole –
The fish is very active and has adapted well to the flow of my tank. It’s a beautiful addition with its distinct yellow fins. I’m impressed by the care taken in shipping and handling.