pol·lock or pol·lack 
(pŏlək)
(pŏlək)n. pl. pollock or pol·locks also pollack or pol·lacks
Any of various marine food fishes of the genera Pollachius and Theragra, closely related to the cod, especially T. chalcogramma of northern Pacific waters, often used for manufactured fish products.
[Middle English poullok, the Atlantic pollock (Pollachius pollachius), of unknown origin.]