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Unraveling the Mysteries of Tuna Quality



a chef slices raw tuna.

The world of sushi and sashimi enthusiasts holds a special fascination for the exquisite and versatile tuna. Tuna, often referred to as the king of the sea, is not only prized for its delicious taste but also for the varying degrees of quality it offers. Understanding tuna grades is essential for both chefs and connoisseurs alike, as it provides insights into the flavor, texture, and overall culinary experience of this revered fish.


The Grading Process:


Tuna grading is a meticulous process that takes into account several key factors, including color, fat content, texture, and overall appearance. The assessment is typically conducted by trained experts who meticulously inspect each fish to ensure it meets specific quality standards.


  1. Color:

  • Grade 1 (Sashimi-grade): Tuna with a deep, vibrant red color is often considered the highest quality for sashimi. This indicates a well-fed and healthy fish with a high concentration of myoglobin, the protein responsible for the rich color.

  • Grade 2 (Culinary-grade): Tuna with a slightly lighter color may still be suitable for sushi and culinary preparations, but it may lack the visual appeal of higher-grade cuts.

  1. Fat Content:

  • Otoro: This is the most prized and fatty part of the tuna, found near the belly. Otoro is rich in marbling, resulting in a buttery texture and an unparalleled melt-in-the-mouth experience.

  • Chutoro: Located between the otoro and akami (leaner meat), chutoro is also prized for its balance of fat and lean muscle, offering a luscious texture and flavor.

  1. Texture:

  • Akami (Lean): This is the leanest part of the tuna, with a firm texture and a deep red color. Akami is commonly used for sushi and sashimi and is appreciated for its clean, meaty taste.

  • Saku (Loins): The loin section, also known as saku, is a versatile cut that combines the meaty texture of akami with a moderate amount of fat, making it suitable for various culinary applications.

  1. Overall Appearance:

  • Glossiness: A glossy appearance is often indicative of freshness. Dull or dry-looking flesh may be a sign of less desirable quality.

  • Bloodline: A smaller or minimal bloodline is preferred for higher-grade tuna, as excessive blood can impart a metallic taste.

It's important to note that the grading system may vary slightly between different markets and regions. Additionally, individual preferences and culinary traditions play a significant role in determining what is considered "high-quality" tuna.


Understanding tuna grades is akin to deciphering a secret code that unlocks the potential of this prized fish. Whether you're a seasoned sushi chef or an avid consumer, being familiar with the nuances of tuna grading allows you to appreciate the subtle differences in flavor and texture.


As you embark on your culinary journey with tuna, explore the diverse grades available, and savor the unique qualities that each cut brings to the table. Experience two types of sashimi grade tuna at your local Pokitomik.

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