bluefin tuna

plural bluefin tunas

1. uncountableusuallyAny member of genus Thunnus of tuna, having blue fins, including

   The San Juan market is Mexico City's most famous deli of exotic meats, where an adventurous shopper can hunt down hard-to-find critters […] But the priciest items in the market aren't the armadillo steaks or even the bluefin tuna.

   2013 July 26, Nick Miroff, “Mexico gets a taste for eating insects […] ”, in The Guardian Weekly, volume 189, number 7, page 32

2. Any member of genus Thunnus of tuna, having blue fins, including:
   1. uncountableusuallyAtlantic bluefin tuna (Thunnus thynnus), found in both the western and eastern Atlantic Ocean, and also
   2. uncountableusuallyin the Mediterranean Sea.
   3. uncountableusuallylongtail tuna (Thunnus tonggol), found in tropical Indo-West Pacific waters.

      Synonyms: northern bluefin tuna

   4. uncountableusuallyPacific bluefin tuna (Thunnus orientalis), found widely in the northern Pacific Ocean and locally in the south.

      Synonyms: northern bluefin tuna

   5. uncountableusuallysouthern bluefin tuna (Thunnus maccoyii) of waters of the southern hemisphere.