I know a little bit of the history of the fish taco.
 
I never went with them, but several friends of mine, mostly police officers, used to take trips to Baja.  Specifically, they went to a town called San Felipe.  They would always come back raving about the fish tacos they got from a cart on the beach.
One of those guys, Steve Rubio, liked them so much, he opened a little restaurant on Mission Bay in San Diego.  He opened in a building that had previously housed an Orange Julius franchise.   Needless to say, the concept went over well.  A few years later, I found fish tacos on a menu in Florida.  Now they’re everywhere.  But Rubio was the visionary.