Question: how much is 1 tuna fish worth?
Answer: A fish in Japan just sold for a record $3 million — here's why bluefin tuna is so expensive. Bluefin tuna can be very expensive, depending on where you buy it and which part of the fish you are eating. At the first bluefin tuna auction of 2019 in Japan, a 612-pound fish sold for a record $3 million.