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Founa in Sri Lanka

Thunnus maccoyii

  Order Perciformes
  Family Scombridae
  Genus Thunnus
  Species T. maccoyii
  Binomial name Thunnus maccoyii
  Local Name Southern bluefin tuna
  Status Native
  Conservation Status

Tuna are salt water fish from the family Scombridae, mostly in the genus Thunnus. Tuna are fast swimmers, and some species are capable of speeds of 70 km/h (43 mph). Unlike most fish, which have white flesh, the muscle tissue of tuna ranges from pink to dark red. The red coloration derives from myoglobin, an oxygen-binding molecule, which tuna express in quantities far higher than most other fish. Some larger tuna species, such as bluefin tuna, display some warm-blooded adaptations, and can raise their body temperatures above water temperatures by means of muscular activity. This enables them to survive in cooler waters and to inhabit a wider range of ocean environments than other types of fish.