Gills didn't evolve into ears. Bones that evolved as supports for gills continued to evolve into jaws. Those jaws evolved in multiple directions (jawless fish are still with us today--this is not a linear process, but a branching one, and we're only addressing one branch). One of those branches had several bones in the jaw adapt to the point where they became part of the ear. This is a well-documented process and we have fossils from most if not all of those stages.
There is no serious scientific support for the Aquatic Ape Hypothesis. Paleontologists and anthropologists treat is as a joke; we get a good laugh out of it. The hypothesis is an exercise in speculation--it takes a few oddities of human physiology and speculates on how they could have arisen. The fossil record disproves it rather completely.
The last line has been demonstrated to be false repeatedly. 65% of retracted papers on PubMed had questions of fraud, and only 45% or so actually contained fraud. The actual percentage of fraud in PubMed publications is closer to 0.005%.
The only statement you made that's even close to reasonable is that scientists believe fish (however you define that term) and humans share a common ancestor. That ancestor has nothing to do with aquatic apes, however; it was a fish, or more accurately it was an extremely primative chordate more similar to fish than to mammals.