The Collaborative International Dictionary of English v.0.48:

Pollock \Pol"lock\, n. [See Pollack.] (Zool.)
   A marine gadoid fish (Pollachius carbonarius), native both
   of the European and American coasts. It is allied to the cod,
   and like it is salted and dried. In England it is called
   coalfish, lob, podley, podling, pollack, etc.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coalfish \Coal"fish`\, n. [Named from the dark color of the
   back.] (Zool.)
   (a) The pollock; -- called also, coalsey, colemie,
       colmey, coal whiting, etc. See Pollock.
   (b) The beshow or candlefish of Alaska.
   (c) The cobia.
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cobia \Co"bi*a\, n. (Zool.)
   An oceanic fish of large size (Elacate canada); the
   crabeater; -- called also bonito, cubbyyew, coalfish,
   and sergeant fish.
   [1913 Webster]