Article: Whole Foods, Wild Oats discontinue sale of tilapia: producers' use of hormones in the farmed fish violates chains' policies.(Retail)

Whole Foods Market and Wild Oats Markets, the nation's two largest natural-foods retailers, halted sales of tilapia after learning that their tilapia suppliers source from producers that use a synthetic hormone early in the production process, which is against the chains' policies.

The hormone, methyltestosterone, is used by a majority of fish farmers to dictate the gender of tilapia at birth. The hormone is added to the fish feed the tilapia receive for the first 28 days to produce more than 95 percent males, which grow faster than females.

MT is flushed out of a fish's system in 21 days and virtually undetectable at harvest about a year later.

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