If I may just ... flesh this out a little ...
First, contrary to the news report

: nobody but nobody in this tale believe that "G-d revealed Himself in fish form." Ummm ... not a Jewish concept, G-d does not reveal Himself and does not take on a form (no offense meant by that to any Christians out there ...)
Well, correction: He did reveal himself to Moses. That's about the whole of it.
Second, the idea of tzaddikim being reincarnated as fish is not new in Jewish mysticism. It is one of the specific reasons that a traditional Jewish food on Shabbos is fish ... whether gefilte or otherwise.

Remembering that Jewish mysticism believes we keep being reincarnated until we "get it right," or fulfill all the mitzvot we can ... also, mystical teachings say that in the time of Noah, one reason the world was destroyed by flood was so the fish would survive, as they were they only other creatures on earth that remained ... well, good.
Personally, I've heard the story for weeks, but never heard about that Luis fellow. I guess that's why the story has gotten so huge ... it's not just one "crazy person" who heard it ... and not only a Jewish person, at that.
Fascinating to me that it's in the international press altogether ...
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