East River Cafe on 1st Ave / 61st St ... Seafood?
I'm not familiar with the East River Cafe so I'm not sure what kind of place you are going for, but I've heard that the grilled fish from Nargila Grill on York betw. 84th and 85th is great. It's a kosher restaurant, so obviously no shellfish. We've been a number of times but stuck to meat, salads and Israeli specialties, all of which are fresh and good. I've seen the fish (whole grilled fish) going to other tables and it looks nice. Homemade flatbread and french fries are great. Atmosphere is casual.