New supplies of white shrimp from Vietnam and India, along with a resurgence in production in Thailand after last year’s floods, are all expected to lead to plentiful supplies in the United States — and that will cause prices to fall.

Many farmers in Vietnam are said to be switching to white shrimp from black tigers, with as much as a 70-30 ratio in favor of whites. Similar reports are coming from India, said one longtime U.S. shrimp importer.

“That’s going to put an awful lot of white…

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