I'm pretty sure that J.C.'s Mariscos Mexican Seafood is owned by Julio Cesar Chavez. I say that because his picture is on the sign, on the menu, on the walls -- his image is everywhere at this tiny, cozy restaurant on El Segundo Boulevard in Hawthorne.
In all, this is good, friendly, and quite cozy little mexican seafood place -- the interior reminded me of a Pizza joint, circa 1984 (Regular John's + Shakeys + lots of Mexican flags and boxing posters). I had the snapper fillet veracruzano -- almost a stew, with bell peppers, onions, and tomatoes. It is definitely on the fishy side, but that's kind of what I expected, and I really enjoyed it (and at $8.95, I was extremely satisfied).
My wife had breaded, fried fish tacos -- similar ingredients to other baja style tacos, but with a different end result. The batter, as opposed to the beer-batter/fish n' chips style of Tacos Baja Ensenada or Senor Fish, was more like what you'd find on fried catfish. It was "crumbed," really; in addition, the crema tasted more like tartar sauce (in a good way) and it was topped with a lightly pickled red onion. Had a tangy, sweet-sour taste we really enjoyed.
Sign promises hand made tortillas, but we ordered corn and ours were definitely not hand made; perhaps it's only a flour thing?
Not sure if it's worth a trip from very far away, but certainly for us South Bay-er's, it's a nice option...
(Note: there's quite a few other promising restaurants on El Segundo Blvd, east of the 405...)
J.C.'s Mariscos Mexican Seafood
4182 West El Segundo Blvd