Rage tails, flapping hogs and other wild baits

I have them, use them, and they catch fish.

I have often wondered what they are supposed to represent since I could not think of a thing they looked like in the environment of the places most of us fish.

This morning I looked at the screen saver on my computer entitled aquarium. It's a "video" of gold fish in an aquarium. As they face you, all the fins are in motion, and the look amazingly like those wild videos of the Ragetail space monkey.

Here's an image of a goldfish with wild, flappy, outsized appendages (dorsal fins, pectoral fins, anal fins, pelvic fins, etc.)

This one appears to be a doubletail.