Feeder Fish. What is the deal here?

"soup" wrote in message .uk...
"Feeder fish" are exactly that they are fish that are going to get fed
to something, so they (the LFS) may realise that the fish in question
is going to die shortly, and selling a lot of fish that die soon after
they
are sold is bad business, hence moving it to the "feeder fish tank",
hence the reduction in cost. There are those who like the challenge
and buy "feeder fish" and "nurse" them so that they live a long time.

I never thought deeply about the word "feeder" until now.
They actually feed these fish TO something?

I thought they were called feeders because all they do is eat (i.e. feed) and they are generic/cheap!

So do all fish in the store become feeders if they show signs of ill-health?
And isn't it a bad idea to feed these sick fish to something else?

Why weren't there any full-grown Fantails and Orandas at the store?
Do the stores manage to sell all their little Orandas and Fantails?
Or does a more sinister future await little fish that don't get sold by some expiry date?