Yellow Fin Tuna / Ahi. Scientific Name : Thunnus albacares

Fresh Yellow Fin tuna is graded based on color, fat content and texture.  Frozen Yellow Fin tuna is often treated with carbon monoxide or tasteless smoke to maintain a red color.  Longline caught fish can sometimes struggle on the line and will work up a heat, which cooks the fish from the inside.  Additionally, sometimes white puss pockets will develop in the meat, which degrade the firmness and texture of the product.  This is called “sashi,” which translates from the Japanese word for “hole.”  Each fish is graded with a core sample and a tail cut to help determine quality.  Unfortunately, it’s often impossible to notice sashi before filleting or steaking the fish.
Industry Sizing & Grading

Tuna Grade and Size

Tuna Nutrition

Tuna Nutrition 2

Expected Fillet Yield

From H&G:

  • To Skin-On, Untrimmed Loins: 70%
  • To Skin-Off, Bloodline Removed Loins: 55%
  • To Skin-Off Steak: 50%
  • To Sashimi: 35%
*Yield varies according to a number of factors including: size of fish, season, sex, and the skill of your fishmonger.


Courtesy of Chef’s Resources and Pacific Seafood, professional fishmonger Rene is going to give a demo on how to [cut] a whole Yellow Fin Tuna into 4 loins.