Fish tacos

I know, I know, I shouldn't order them around here at all, really, but I did. Previously, they've been dry, unless some sauce was indicated, but when I ordered them locally they had a mayo-based sauce on them, in addition to the chipotle sauce (which was red) listed on the menu.

Is this normal around here? Should I expect a "fish salad" taco when ordering these unless otherwise indicated, much like how I learned (to my hungover dismay) that hot turkey sandwiches come with creamy country gravy in the south?