#mackerel_shark  fierce pelagic and oceanic sharks
  supertype:  shark  any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough skin covered with small toothlike scales
  member of:  family_Lamnidae
  subtype:  porbeagle__Lamna_nasus  voracious pointed-nose shark of northern Atlantic and Pacific
  subtype:  mako_shark__mako  powerful mackerel shark of the Atlantic and Pacific
     subtype:  shortfin_mako__Isurus_oxyrhincus  very swift active bluish shark found worldwide in warm waters; important game fish
     subtype:  longfin_mako__longfinmako__Isurus_paucus  similar to shortfin mako but darker blue
     subtype:  bonito_shark__blue_pointed__Isurus_glaucus  common blue-gray shark of southwest Pacific; sport and food fish
  subtype:  great_white_shark__greatwhiteshark__white_shark__whiteshark__man-eater__maneater__man-eating_shark__Carcharodon_carcharias  large aggressive shark widespread in warm seas; known to attack humans
  subtype:  basking_shark__baskingshark__Cetorhinus_maximus  large harmless plankton-eating northern shark; often swims slowly or floats at the sea surface

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