Do you buy frozen catfish and eat them, thinking that they're safe to eat? Maybe that they are healthy? 85,000,000 lbs Vietnamese catfish was sold to the US in 2009.
It's not a good idea to consume fish that are raised in the Far East. Often when ordering a fish in Asia, the live fish will be brought to your table for your approval, it will be cleaned and cooked table-side so that another fish can't be substituted.
I know of a company that tried to sell frozen rats to the USA, and was shocked when he found that there was no market for his wares.
There may be a lesson in this.
h/t BR Man