#genus_Thunnus__Thunnus  tunas: warm-blooded fishes
  supertype:  #fish_genus  any of various genus of fish
  member of:  #family_Scombridae
  member:  #tuna__tunny  any very large marine food and game fish of the genus Thunnus; related to mackerel; chiefly of warm waters
  member:  #horse_mackerel__horsemackerel__bluefin__bluefin_tuna__bluefintuna__Thunnus_thynnus  largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics
  member:  #yellowfin_tuna__yellowfintuna__yellowfin__Thunnus_albacares  may reach 400 pounds; worldwide in tropics

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