I know I know. (Just finished reading up on it.
You can introduced fish at around 8/9 mos and for shellfish to wait till after 1yo. If there is a history of allergy in the family then wait till 2. HTH
Oh, I'm in Canada and I know that guidelines tend to differ between countries. But I think that if there is no known allergy in the family then you can pretty much introduce anything other than the big no nos like honey, peanuts, egg whites, etc.