Answer: ganoid

AnswerCrossword Clue
GANOIDSturgeon.
GANOIDOf a fish genus
ganoidganoid fish
ganoid(of the scale of a fish) having a smooth, shiny surface of ganoin or a similar substance
ganoidof or pertaining to the Ganoidei, a group of mostly extinct fishes characterized by hard, bony scales, the living species of which include the paddlefishes, sturgeons, and gars