Check out these fish images:

Fish

Image by malias
Fish from Ueno market

Fish

Image by tkcrash123
Mucking around with fish in our tank

Fish Finger

Image by Nicolas Valentin
In fly fishing, fish are caught by using artificial flies that are cast with a fly rod and a fly line. The fly line (today, almost always coated with plastic) is heavy enough cast in order to send the fly to the target. Artificial flies can vary dramatically in all morphological characteristics (size, weight, colour, etc.).