🐟 How Old Is a 400kg Bluefin Tuna?
When people visit Japan, they are often surprised by the size of bluefin tuna.
At auctions connected to Toyosu Market,
some tuna weigh 300kg, 400kg, or even more.
So how old is a 400kg bluefin tuna?
The Answer
A 400kg Pacific bluefin tuna is usually around 15–20 years old.
Bluefin tuna grow slowly compared to other fish.
They become mature at around 5 years old,
but reaching 400kg takes many more years.
Why Winter Tuna Tastes Better
In winter, especially tuna caught near Hokkaido,
the fish build up more fat to survive cold water.
That is why winter bluefin has:
• More balanced fat
• Sweeter red meat (akami)
• Richer flavor
Size is important, but season is even more important.
What Really Determines Value
In the tuna industry, price depends on:
• Fat quality
• Color of the meat
• Damage-free handling
• Season
• Auction demand
Weight alone does not decide price.
If you love sushi, understanding the age and season of tuna
will change the way you taste it.
Welcome to the real world of tuna.
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