The Collaborative International Dictionary of English v.0.48:

Sciaenoid \Sci*ae"noid\, a. [L. sciaena a kind of fish (fr. Gr.
   ?) + -oid.] (Zool.)
   Of or pertaining to the Sciaenidae, a family of carnivorous
   marine fishes which includes the meagre (Sciaena umbra or
   Sciaena aquila), and fish of the drum and croaker
   families. The croaker is so called because it may make a
   croaking noise by use of its bladder; the Atlantic croaker
   (Micropogonias undulatus, formerly Micropogon undulatus)
   and the squeteague are a members of the croaker family, and
   the kingfish is a drum.
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

Atlantic croaker
    n 1: a silvery-bodied croaker with dark markings and tiny
         barbels [syn: Atlantic croaker, Micropogonias
         undulatus]