mackerel scout

Same as mackerel - guide. mackerel-shark (mak'e-rel-shärk), n. One of several kinds of sharks, as Isurus dekayi, or the Mackerel-shark, or Porbeagle ( Lamna cornubica). porbeagle, Lamna cornubica. They have a forked tail like a mackerel, attain a length of 10 feet, and annoy fishermen by biting off their lines. See porbeagle.