Along with Blizzard's 3.1 release for World of Warcraft, there were changes that effect how one fishes in Azeroth and Outland. Where before, there were both a minimum and a no-get-away level for each zone. After the patch, one can fish any where at any level. The catch is, one will catch more junk if he is in an zone that he is too low to fish in. Although, he will still gain fishing level as if he was fishing in a zone that he properly experienced for.
So the questions are, if one is fishing in a zone that he meets and exceeds the required minimum fishing level for, whether it be with or without fishing gear and bait, does he have a chance to fish up junk still, let a fish get away, and fish up the better catch at a higher rate for the zone? Along with those three questions, does the bobber have a higher chance to bob earlier in the fishing cast too?
Note: Please keep in mind that there are four questions with in this one Gaming SE question? Since I already know how to fish, please do not post links to fishing tutorials. These are questions that I have always ask myself time after time but was never able to find answers. I can't be the only one who has thought about these same questions. Maybe I am though?