haddock \had"dock\ -du^k, n. oe. hadok, haddok, of unknown
   origin; cf. ir. codog, gael. adag, f. hadot. zool.
   a marine food fish melanogrammus aeglefinus, allied to
   the cod, inhabiting the northern coasts of europe and
   america. it has a dark lateral line and a black spot on each
   side of the body, just back of the gills. galled also
   haddie, and dickie.
   1913 webster

   norway haddock, a marine edible fish sebastes marinus
      of northern europe and america. see rose fish.
      1913 webster
see also:
melanogrammus aeglefinus haddie dickie norway haddock sebastes marinus rose fish 

rosefish \rose"fish`\, n. zool.
   a large marine scorpaenoid food fish sebastes marinus
   found on the northern coasts of europe and america. called
   also red perch, hemdurgan, norway haddok, and also,
   erroneously, snapper, bream, and bergylt.
   1913 webster

   note: when full grown it is usually bright rose-red or
         orange-red; the young are usually mottled with red and
         ducky brown.
         1913 webster
see also:
sebastes marinus red perch hemdurgan norway haddok snapper bream 
bergylt