Need fresh tuna? Think Super frozen! Sashimi Quality and Supreme Taste. Immediately stored at a temperature of -60°C, Super Frozen tuna sustains no deterioration at this temperature and can therefore compete with so-called fresh fish. Even the most experienced chefs are impressed with how fresh Super Frozen tuna can be, it’s like “Just-out-of-the-Water” tuna. Loss of moisture and flavor is the primary complaint of the professional chef when using conventional frozen tuna products. With Super Frozen tuna this is not the case.