In the level 55 Fishing quest 'Invasion of the Supper Snatchers' the player is tasked with catching 3 Shadowhiskers.

The Tailfeather hunter you speak to mentions "They ain't native to this area, see-some lunkhead hunter decided to bring them in special when no one was looking, and set them free in the river"

I've tried searching but these 'Shadowhiskers' are nowhere to be found outside of the Dravanian Forelands.

So, question is, where do the Shadowhisker fish originally come from?