Aquarist Atlas

Aquarium fish, the waters they come from, and how to keep them — free for everyone.

An open guide to the world's aquarium fish and the waters they live in. Easy to use, easy to learn from, and free to anyone curious enough to look.

Explore the Atlas →
16,419species documented
32water bodies
22fish families
133newly described species123scientific name updatesWhat’s new →

Why free matters

Curiosity shouldn't have a price tag. When information is free, the only thing standing between someone and a lifelong hobby is interest — not budget. A kid with a first ten-gallon, a student, a retiree setting up the tank they always wanted, a seasoned keeper checking a name — same door, same access, no barrier.

That's the whole idea: lower the bar to learning as far as it'll go, and let curiosity do the rest.

What you'll find

  • Organized by water, not just by name. The Atlas is built around the lakes, rivers, and drainage basins these fish actually live in — so species make sense in context, not as a wall of Latin names.
  • Taxonomy you can trust. Names anchored to authoritative scientific sources, so what you read lines up with current science.
  • Linked to the wider record. Articles point you to the other sources worth reading — so the Atlas is a starting point for deeper research, not a dead end.
  • Beginner to deep end, one site. “Will this fish eat my other fish?” and “how do I breed this rare wild-caught species?” live in the same place. It grows with you.

Where this is going

Every advanced hobbyist started as a curious beginner who found good information and kept going. The Atlas is meant to be that on-ramp — a single, easy place to go from what is this fish to I'm breeding something most people have never kept — and to grow the next generation of serious keepers this community runs on.

Free. Open. For everyone.