bloater

from WordNet (r) 3.0 (2006)

bloater
    n 1: large fatty herring lightly salted and briefly smoked

from The Collaborative International Dictionary of English v.0.48

Bloater \Bloat"er\ (-[~e]r), n. [See {Bloat}, {Blote}.]
   The common herring, esp. when of large size, smoked, and half
   dried; -- called also {bloat herring}.
   [1913 Webster]