- Green, if caught via troll or pole from the U.S. Atlantic,
- Yellow, if caught via longline from the U.S. Atlantic, and
- Red, if caught elsewhere.
Indigestion is resolved. I made a call to the headquarters of the grocery store where I purchased the tuna and know the questions to ask the staff next time. The Seafood Watch pocket guide is handy for future shopping. I'll look at the list next time and keep working to find a trusted seafood supplier.