It is the name given to a young catfish.
If you mean fingerling fish (young fish the size of a finger), it depends on the species. By the time something like a bass is a fingerling it already wants meat - instects and other fish. You have a hard time keeping preadatory fish from eating each other. Fish like catfish will eat food pellets and algae/bugs. Fish like tilapia will eat algae.
Fingerling
fingerling
Fry or fingerling..
Either fry or fingerling.
fingerling - starplazza
Well, isn't that just delightful! A baby catfish is called a "fry." Just like a little seed growing into a beautiful tree, these tiny fry will grow up to be strong and majestic catfish swimming gracefully in the waters. Remember, every little creature has its own journey and beauty to share with the world.
fingerling
A young salmon. See Parr.
Most times they are called fry or fingerling
Young fish in general are referred to as a fry, or fingerling.
Fry, fingerling, juvenile, adult.