What's in that can of tuna?

Canned tuna is full of fishy secrets, according to Greenpeace.

A new study says that the cans have tuna, but not always the tuna that you're promised on the label.

Sometimes the cans have the wrong tuna, and sometimes a single can may have two different types of tuna, which Greenpeace says is illegal in the EU (I don't know if that's true).

Not a good thing if tuna companies want to build public confidence.

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