If a recipe says 2 pounds Sea Bass - do they mean Chilean Sea Bass?
There are many fish called Sea Bass. In California: we have Striped Bass, White Sea Bass, Black Sea Bass (protected), and probably some more.
Chilean Sea Bass is a market name for Patagonian Tooth Fish, and is not a member of the sea bass family.
Chilean Sea Bass are an endangered species due to overfishing.
It's hard to say, since in Spanish there are many more precise terms for fish than are used in English...
I would guess that the original recipe would call for "lubina" or "dorada" (or possibly "besugo"). The latter two are technically types of bream, but are often translated into english as "sea bass." Here in Spain you can buy these fish farmed, wild, net-caught and line-caught. The trouble is that fishmongers in the states tend to mislabel fish quite a bit, so unless you know what a fish looks like, you don't know what you are getting.
What is the dish? I can check it against the Catalan cookbooks that I have.