I was told that more than 3 fish market pictures was boring. So if this applies to you, you're done now. For bigger fish fans, the Tsukiji fish market, the biggest in the world, is my favourite Tokyo attraction. Between 5 and 6:15am (yes, we made it), you can witness the tuna auction:
Once auctioned, the tunas get cut with huge knives.
We'll skip some steps, but here is what's offered for breakfast. 
If your attention span can handle more, it's here.