You wouldn't want to use salmon or something like sea bass with a Lemon-caper sauce in any case; that sauce calls for a much more delicate white-fleshed fish. (Note that if you use sole, which is the classic fish with lemon-caper sauce, it tends to be very full of water and will shrink up a LOT when cooked; start with twice as much as you expect to eat.)
THE easiest way to make fish (and it works for nearly every variety) is to either saute it or bake it with ordinary bottled Italian salad dressing poured over it, plus a bit of garlic. Simplest thing ever.
BTW, on the sea bass thing; there are quite a few fish genera that get sold as sea bass. The fish commonly known as Chilean Sea Bass (actually Patagonian Toothfish) is quite oily, though most of the oil is omega-3, so it's still healthy. It's also a very endangered species. Goliath Grouper is sometimes marketed as Giant Sea Bass, and again, it's endangered, though not nearly as badly as Toothfish. "White" Sea Bass is actually a large species of saltwater croaker native to Pacific waters; that one isn't oily at all, and is very sustainable.
REAL sea bass, that is actually a species of bass, is more commonly known to fishermen in the US as "Striped Bass" or "Striper" (Billy Joel even mentions them in a song, The Downeaster Alexa). Stripers had been badly overfished in the Grand Banks area and off the Massachusetts coast and the catch was strictly limited for awhile to allow them to come back. The effort has been successful and they are now abundant again. It's a bit oily, but not seriously so.