In the Squid Jump mini-game in Splatoon, there are randomly different fish scattered throughout the level. Example (from Wikia):
It is obviously what the red fish does: giving you a high jump boost. However, in later levels there are different colored fish. I only saw white ones, but I have no reason to assume it stops there. There was no apparent effect when I touched this fish.
So, what fishes can I encounter in which stages, and what are their effects?