Looked at the brand name Tuna in my cupboard and of course it was canned in Thailand.
Then went to tuna.com.au (a website apparently created by people that sell Greenseas) to discover:
"Check your can of tuna. Does it say “Product of Thailand“? The majority of canned tuna in Australia does. Thailand has developed a very efficient and high quality tuna canning industry with easy access to global markets.
Thailand currently processes around half of the canned tuna consumed globally. That’s approximately 750,000 tonnes every year. Australia’s share of the global canned tuna market is pretty small by comparison – only around 31,000 tonnes per year.
Still, that’s a lot of tuna and demand is increasing because canned tuna is such an affordable, convenient and healthy snack – high in protein, low in fat and contains essential nutrients like Omega-3."
I guess there is nothing wrong with Thailand, but again, the inference is that (some) cheap Asian processing might cut corners including hygienically.