Bad things. Mushy texture is the big one. That beautiful, buttery, meaty flesh turns into cat food consistency. You’ll be able to flake it with a whisper.
You also risk bacterial growth. The “danger zone” for fish is between 40°F and 140°F. If your ahi hangs out there for too long, it’s not just gross—it’s unsafe to eat raw.
And nobody wants a raw tuna that tastes like a science experiment. Nobody.
What About Thawing in the Bag It Came In?
Yes! Keep it in that vacuum-sealed bag. That bag is its castle. It protects the fish from absorbing weird fridge smells (hello, leftover garlic) and prevents water from washing away flavor.
How to Defrost Superfrozen Yellowfin Tuna Tataki - YouTube
Just make sure you open the bag immediately after thawing. Let it breathe. Otherwise, it can develop a weird, metallic smell. No one likes tuna that smells like a penny.