Final answer:
The statement that 'fresh fish' is previously frozen can be either true or false, as it depends on context. Many 'fresh' fish sold in markets have been frozen for safety, but some may never have been frozen. Freezing is significant for killing parasites, particularly in raw sushi consumption.
Step-by-step explanation:
The statement 'fresh fish' is previously frozen can be true or false depending on the specific context in which the fish is marketed or sold. While 'fresh fish' generally implies that the fish has not been frozen and is recently caught, many fish sold as 'fresh' in markets have actually been previously frozen to ensure safety, particularly in regards to sushi consumption. However, it is also true that some fish is never frozen and is sold truly fresh. Therefore, the classification of fish as 'fresh' can vary, and the statement can be either true or false.
Notably, freezing is an important safety measure for fish destined for raw consumption, as the extremely low temperatures can kill parasites like worms and larvae, reducing the risk of infection. Although consuming fresh, raw sushi is a popular choice, one should be aware of the potential risks involved when eating fish that hasn't been previously frozen or cooked.