Proper fish breakfast buffets in Berlin

Hello Berliners,
I an an American living in Hamburg who just had a delicious "proper fish breakfast" at the Hamburger Fischmarkt cafe on Sunday morning. It was great - all you can eat for 12,50 Euros - smoked fish, fish salads, kraut, tons of fruit, breads, cheeses, meats, eggs, pudding, coffee, beer, etc etc etc. Plus there was the joy of watching all the Germans dance to the live band; some of them early riders and others had been up since the night before in the discos... I have some friends coming from the States in March to visit and I would love to share this experience with them. However we will be in Berlin over the weekend that they are here and was wondering if there is anything similar in Berlin that we could check out instead? Crossing my fingers...

Was at a party recently with a few Berliners. I asked the above question and discovered that there are some nice places to have breakfast, but didn't get a chance to write it down. Anyone know of anything? Thanks!