The Collaborative International Dictionary of English v.0.48:

Sea poacher \Sea" poach"er\ (s[=e]" p[=o]ch"[~e]r). Sea poker
\Sea" pok"er\ (s[=e]" p[=o]k"[~e]r). (Zool.)
   The lyrie.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Poacher \Poach"er\ (p[=o]ch"[~e]r), n.
   1. One who poaches; one who kills or catches game or fish
      contrary to law.
      [1913 Webster]

   2. (Zool.) The American widgeon. [Local, U.S.]
      [1913 Webster]

   Sea poacher (Zool.), the lyrie.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lyrie \Ly"rie\ (l[imac]"r[i^]), n. [Icel. hl[=y]ri a sort of
   fish.] (Zool.)
   A European fish (Peristethus cataphractum), having the body
   covered with bony plates, and having three spines projecting
   in front of the nose; -- called also noble, pluck,
   pogge, sea poacher, and armed bullhead.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sea poacher
    n 1: small slender fish (to 8 inches) with body covered by bony
         plates; chiefly of deeper northern Pacific waters [syn:
         poacher, sea poacher, sea poker]