DHA and EPA from marine algae instead of fish are available now (google it). Algae is where the fish get it anyway.

I read somewhere that you're better off eating carnivore fish because the DHA and EPA are more concentrated than in herbivore fish or algae. Unless you're talking getting them from pills, in which case I guess it doesn't matter much.

P.S.: You should still avoid big species like tuna or swordfish, since they have high concentrations of mercury.

When you take pills, you get however many milligrams of the substance are in the pills. You're probably thinking of flax oil and other sources of ALA, which your body must convert itself into EPA and DHA. Yes, one of the reasons to get it from algae directly is you avoid the environmental pollutants that accumulate in the marine ecosystem as you go up the food chain (PCBs, dioxins, mercury, etc.).

Depends on your locale. I bought fish for a family lunch of twelve today. Six dozen fresh sardines, 24 EUR. It would have costed more to order hamburgers or pizza for twelve. YMMV.

Yeah, but then you had to eat sardines. ;)

What do you mean? Fresh, lightly grilled sardines (with boiled potatoes dipped in their grease) is far and away my favorite food. Maybe you only tried them canned?

Indeed. Or, actually, I've only smelled them as the can is opened; I don't think I've ever actually eaten any. But I understand that lots of people like sardines -- it was suppose to be merely funny. :)