Fresh Bluefin Tuna Belly (Otoro)

  • Riviera Seafood Club's Fresh Bluefin Tuna Belly (Otoro), scientifically named Thunnus orientalis, is responsibly ranched and harvested using the Ikejime method in the waters surrounding Baja, Mexico. With each bite your palate is pleased with waves of full and rich umami flavor, complemented by a soft and buttery texture with the skin-off and no bones. Our Bluefin Tuna Belly is prepared as a sushi and sashimi grade Saku (block), which is typically only found at high-end sushi restaurants.

    Otoro is the belly cut of the highly prized Bluefin Tuna featuring intense fat marbling resulting in a rich, melt-in-your-mouth buttery flavor and tenderness not found with any other fish. Our Bluefin Tuna is responsibly wild-caught as a juvenile and farm raised at Baja Aqua Farms in Mexico where they are raised into healthy adults. Riviera's Bluefin Tuna and other fish are NEVER injected with artificial colorings or carbon monoxide to retain color.

    All orders of Fresh Bluefin Tuna Belly are individually packed and shipped in a refrigerated box using overnight express delivery. We guarantee our Bluefin Tuna is the best quality that you can find, perfect for sushi, sashimi or a light searing.


    • Species: Bluefin Tuna
    • Scientific Name: Thunnus orientalis
    • Japanese Name: Hon Maguro
    • Cut: Saku (Block)
    • Flavor: Full rich flavor with very high umami
    • Texture: Soft and buttery; skin-off, no bones
    • Source: Ranched in or near Baja, Mexico
    • Method of Harvest: Ikejime
    • Sustainable: No
    • Responsible: Yes
    • Packaged: Fresh (not frozen)
    • Sushi Grade: Yes
    • Recommended Preparation: Sashimi, Sushi, or Light Searing
  • For a quality seafood experience and maximum freshness, we recommend defrosting and using as soon as possible.

    If the superfrozen fish is not going to be consumed immediately, it can be stored in a conventional freezer for approximately up to 2 weeks before losing quality (change color/oxidation).

    Superfrozen Defrosting Instructions

    1. Method I:  Place superfrozen product in cold water for 15 to 30 minutes, until thawed.  Remove the portion from the plastic, pat dry with a paper towel, cut and enjoy within 24 hours.
    2. Method II:  Remove the portion from the plastic bag, wrap with a paper towel and place in the refrigerator overnight.  Cut and enjoy within 24 hours.


    What is Superfrozen Technology and How Does it Work?

    Conventional Freezing

    We all know that if you put a bottle of water into a freezer the ice EXPANDS, breaking the bottle.  On a cellular level, when fish freezes the ice crystals break through the membrane of the cell, and later when the fish is thawed there’s an accompanying pool of water, and a “spongy” texture to the thawed fish.

    Superfrozen Technology

    Maximum ice expansion occurs at -5°C, but CONTRACTS at lower temperatures.  Superfrozen technology takes advantage of this property, wherein  fish “flash frozen” at -60-70°C (superfrozen) temperatures, pass through the -5°C phase so quickly that ice DOESN’T HAVE TIME TO EXPAND THEN CONTRACT, thus never lysing the cell membrane.  The result is firm, springy texture to the meat, with minimal loss of freshness and nutrients.

    The most dramatic example of this technology is that after being stored at superfrozen temperature for 2 YEARS some pieces of tuna in fact can “curl up” into rigor upon thaw--as they didn’t have time to go into rigor at time of capture or harvest !

  • Arrives in a 1/2 pound fresh portion, wrapped in food-grade absorbent paper, then in an individualized loin bag. Fresh, (not frozen) Tuna can be stored in the refrigerator for sashimi use immediately upon arrival. For raw consumption, eat within 1-2 days. Any longer, the portion will be searing, poke, or cooking grade. You can also freeze these portions immediately upon arrival and store for up to one week for sashimi use or 10 days for poke, searing, and cooking preparations (keep in mind that freezing sashimi grade fish does slowly diminish the quality of the meat as the cell membrane is not well maintained in conventional home freezers). Rule of thumb-- eat it while it's fresh!

Customer Reviews

Based on 33 reviews
Jon W.

Best Otoro I’ve ever eaten. Buttery, rich, flavorful!!!

Worth it!

You get what you paid for!! I was so happy and impressed with the quality and the taste of this otoro. Money well spent!

Paul F.
Luxurious and Extremely Fresh

Amazing tuna. Extremely fresh, flavorful, and that melt in your mouth feel. This is top notch quality on par with what I've had in high end restaurants both in Hawaii and Japan. The entire family loved it. Thank you for sourcing such amazing seafood.

Excellent Otoro

I was delighted that the Otoro arrived fresh. I had ordered (5) 8 oz blocks and had to test one and super-freeze the rest. Having once lived in NYC and now in FL, the quality of the tuna exceeded my expectations. Do something nice for someone or for yourself and BUY this product.

High Quality Otoro

I’ve been lucky enough to have had the pleasure of eating high quality Otoro in restaurants throughout Shinagawa City, Chiba, Yokohama and other locations in Japan so I was pleasantly surprised to find the Quality provided by Riviera Seafood Club to be in the same league. The melt in your mouth quality was what I experienced. Excellent with a slight touch of soy sauce or seared with Yuzu juice!