Not only is eating fish not the most sustainable of food choices, it's likely a rip-off. If you're eating a pricey fish like cod or salmon, there's more than a one in five chance that it's something much cheaper. The FDA, though, is developing a new regulatory program to fight fish fraud. The agency is building a library of fish DNA that it can use to test samples of raw, frozen, steamed, or deep-fried fish and determine the sample's species.

This genetic identification process is known as DNA bar coding, and it's gotten so cheap that the FDA can do a bar code test for about $10 a sample. That might keep sellers from trying to pass off fishy fish, which is pretty gross, as an ocean scientist explained to The New York Times back in May:

“If you’re ordering steak, you would never be served horse meat,” said Dr. Hirshfield of Oceana. “But you can easily be ordering snapper and get tilapia or Vietnamese catfish.”

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The agency isn't just concerned about overpriced snapper substitutes, though. Mislabeled, toxic fish has sickened people in the past.

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One point of order: if your fish doesn’t taste like it's supposed to, do not cut off a sample and send it to the FDA! They don't want your half-eaten dinner! You can file a complaint, though, and the agency might investigate.