• The spawning period for mackerel in the North Sea 

      Bakken, Erling; Bjørke, Herman; Afonso, Maria Hortense Dias (ICES CM Documents;1977/H:26, Working paper, 1977)
      The intensity and duration of the spawning of mackerel (Scomber scombrus L.) was studied by daily plankton sampling from late May to early July 1976 at a single locality in the central part of the spawning area in the North ...