Definitions for fallfishˈfɔlˌfɪʃ
Random House Webster's College Dictionary
a large minnow, Semotilus corporalis, of E North America.
Origin of fallfish:
A small silvery freshwater fish (Semotilus corporalis) found in North America.
a fresh-water fish of the United States (Semotilus bullaris); -- called also silver chub, and Shiner. The name is also applied to other allied species