What is the meaning of Bluefin_tuna?

Any member of genus Thunnus of tuna, having blue fins, including:

  1. Atlantic bluefin tuna (Thunnus thynnus), found in both the western and eastern Atlantic Ocean, and also
    in the Mediterranean Sea.
  2. longtail tuna (Thunnus tonggol), found in tropical Indo-West Pacific waters.
  3. Pacific bluefin tuna (Thunnus orientalis), found widely in the northern Pacific Ocean and locally in the south.
  4. southern bluefin tuna (Thunnus maccoyii).

Atlantic bluefin tuna (Thunnus thynnus), found in both the western and eastern Atlantic Ocean, and also
in the Mediterranean Sea.

longtail tuna (Thunnus tonggol), found in tropical Indo-West Pacific waters.

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

southern bluefin tuna (Thunnus maccoyii).

Source: wiktionary.org