We have either fish or shellfish for dinner. I often skip either breakfast or lunch. It's really only difficult if we are attending a dinner function, but with so many vegetarians these days, I can usually find something.
I always found it ironic when people went out for King Crab or Lobster on Fridays (doesn't quite seem consistent with the idea of fasting...even mildly...does it?)
But, hey, it's something.
Maybe this country will return to that year 'round (like they recently did in, of all places, the UK)