(This venue is closed.) That popeyed profile and those sturdy pecs could only belong to a mudskipper, an amphibious fish related to the goby that can muscle its way across mud flats using its strong pectoral fins. (Here's a clearer view of a related blue-spotted species; there's even an entire website devoted to the mudskipper.)
I never imagined them on any bill of fare, but American Fu Zhou Grocery (where English is not the first language, and maybe not the second) must be confident of the market: These mudskippers were swimming in a foam box marked with an Air China waybill.
American Fu Zhou Grocery
101 E. Broadway (Market-Pike Sts.)
212-385-0658