The world's largest canned-tuna maker, Thai Union Group Plc, said on Monday any migrant labour abuse in the seafood industry was unacceptable.
The statement came after The Associated Press reported that shrimp processed in plants using forced and child labour in Thailand was on the shelves in US stores.
One of those plants allegedly supplied a subsidiary of Thai Union, AP reported.
Greenpeace called on the company and the Thai seafood sector to do more on the issue.
The news comes as Thailand faces pressure from the European Union to clean up in another problem area in the industry -- illegal fishing -- or face a trade ban.
"Any illegal or unethical labour practices are unacceptable to Thai Union," the company's chief executive Thiraphong Chansiri said in the statement. "This is yet another wakeup call not only to us, but to the entire industry."
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