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Thorny Catfish

Anadoras grypus

A compact Amazonian thorny catfish with surprising personality for its small size.

Thorny Catfish
AI-generated illustration
© Google Gemini 2.5 Flash Image · AI-generated

About

Found in the upper Amazon River basin of South America, Anadoras grypus is a small doradid catfish that most hobbyists outside specialist circles have yet to discover. Like other members of the thorny catfish family, it carries a row of lateral scutes along each flank. Bony, spine-bearing plates that give it a distinctive armored appearance and make it noticeably tougher to the touch than most catfish you'd handle. It stays on the smaller side for a doradid, which makes it workable in modest-sized tanks. In the aquarium, these fish spend much of their time in classic doradid fashion: wedged under driftwood, tucked into caves, or generally making themselves invisible during daylight hours. Come evening they become noticeably more active, picking through the substrate and grazing on whatever organic material they find. They're not aggressive toward tankmates, but they're sturdy enough that most fish leave them alone. A mixed diet of sinking pellets, frozen bloodworms, and occasional vegetable matter suits them well. This isn't a species for complete beginners, they benefit from a keeper who understands the importance of water quality and proper hiding spots, but they're a genuinely rewarding and underappreciated addition to a South American biotope setup.

Frequently asked questions

How big does the Thorny Catfish get?
The Thorny Catfish reaches about 3.5–5.5" as an adult.
What size tank does the Thorny Catfish need?
A minimum of 25 gallons is recommended for the Thorny Catfish.
What water parameters does the Thorny Catfish need?
The Thorny Catfish does best with a temperature of 72–79°F, a pH of 6.2–7.2, hardness around 10–15 dGH.
Is the Thorny Catfish aggressive?
The Thorny Catfish is generally peaceful and suits a community tank with similarly calm tankmates.
What does the Thorny Catfish eat?
The Thorny Catfish is an omnivore. It does well on a varied diet of quality flake or pellet plus occasional frozen or live foods.
How long does the Thorny Catfish live?
With good care, the Thorny Catfish typically lives 5-8 years.