Wha? This is a mummy with level 10 fishing(and everything else) and done with the skill challenges. She was tutored to this level and, as shown in the picture, is the first time she caught a Minnow - from a pond that does not have Minnow.
Ah, but you have a point there. What if a beginner fisher went fishing in my pond? Hmm.. Well, since it's possible for a level 3 to fish Deathfish, then I'd think a beginner fisher could fish what was in the pond... but not what's not in the pond.