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Despite strong lobbying from northwestern senators for a measure that would require more testing of genetically engineered salmon before it’s introduced in the US,  the Senate on Thursday voted it down. The “frankenfish” measure, introduced by Alaskan Republican Lisa Murkowski, failed by a 46-50 vote.

Murkowski put forth the measure as an amendment to the Food and Drug Administration Reauthorization Bill (a measure that would create a user-fee to partially fund FDA’s work).  Her measure would have required that the FDA hold off on approving or rejecting so-called “test tube salmon” until the National Oceanic and Atmospheric Administration has done its own tests on the environmental and economic impacts the salmon might have on fisheries.

The FDA granted preliminary approved for GE salmon back in September 2010, but it remains a contentious issue. If approved, it would be the first GE animal approved for human consumption in the US.

AquaBounty Technologies has been seeking approval for the fish for 15 years. The fish is an Atlantic salmon that has been tweaked to include a growth hormone gene from a Chinook salmon that allows the fish to grow to full size in half the time it takes for normal Atlantic salmon. But that’s probably the least strange thing about them. As the Los Angeles Times described last year, the company’s proposal “calls for the embryos of the fish to be sterilized in Canada before being shipped to Panama, where the males would be exposed to estrogen and sex-reversed.”