Don't sue me if my calories and carbs are off.
Fish flesh has varying amounts of Mercury. The US RDA of mercury is NONE. Mercury in your food = bad. There are a few sites online that will give you some honest info about fish -- I like the ones that are more honest than the EPA and less honest than the sites that tell you to NEVER EVER EAT ANY FISH. A few have little printable forms you can take with you to the grocery store so you can compare what's on sale and looks and smells right to what could potentially cause irreversible damage to your central nervous system. And you know what I'm discovering? The stuff is more expensive than red meat!
But I really like fish so I go on clutching my list and shopping carefully.