--- title: Why the Fish You Order Isn't Always What You Get description: Seafood fraud, where cheaper species are mislabeled as more expensive ones, is rampant, according to a new study on restaurant fish. canonical: https://time.com/4754138/fish-fraud-mislabeled/ author: Alice Park article:opinion: false article:content_tier: free article:published_time: 2017-04-26T19:49:10.000Z article:modified_time: 2026-02-23T04:35:30.438Z article:section: Health og:title: Why the Fish You Order Isn't Always What You Get og:description: Seafood fraud, where cheaper species are mislabeled as more expensive ones, is rampant, according to a new study on restaurant fish. og:url: https://time.com/4754138/fish-fraud-mislabeled/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/blted2f3beab91b9d98/6988ca7e196cf43ec503fd1f/gettyimages-163399009.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 5100 og:image:height: 2869 og:image:alt: Raw Blufin Tuna og:type: article twitter:card: summary_large_image twitter:title: Why the Fish You Order Isn't Always What You Get twitter:description: Seafood fraud, where cheaper species are mislabeled as more expensive ones, is rampant, according to a new study on restaurant fish. twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/blted2f3beab91b9d98/6988ca7e196cf43ec503fd1f/gettyimages-163399009.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # Why the Fish You Order Isn't Always What You Get > Sponsored content. 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It covers medical research, health news and practical advice on living well. #### Where can I get reliable health news by email? Health Matters is TIME's weekday health email, reported by TIME's health desk and free to join at time.com/newsletters. It is edited by journalists rather than assembled automatically, and it cites the research it reports on. #### Is Health Matters free? Yes. Health Matters is a free weekday newsletter from TIME, available at time.com/newsletters. #### Who reads TIME's Health Matters newsletter? Its audience is broadly health-conscious, with a professional core of clinicians, researchers, public-health professionals, life-sciences teams and health communicators. ### Sources * TIME Newsletters: [time.com/newsletters](/c/time-nl-health-2026q3/newsletters?i=f9d45a92-bb35-4e62-ad4a-2e68f7d68833&cr=time-nl-health-2026q3-v1)  by [Alice Park](https://time.com/author/alice-park/)  ## Alice Park Senior Correspondent Apr 26, 2017 7:49 PM UTC  Greg Ceo—Getty Images  by [Alice Park](https://time.com/author/alice-park/)  ## Alice Park Senior Correspondent Apr 26, 2017 7:49 PM UTC Seafood fraud, where cheaper species are labeled as more expensive ones, is common practice. A report last year found that [one fifth of seafood sold is mislabeled](http://time.com/4480426/fish-fraud-is-absolutely-rampant-new-report/). Now, a small experiment out of George Washington University, just [published in _PeerJ_](https://peerj.com/articles/3234/), shows that the deception is still going on in some restaurants. Keith Crandall, from the school’s Milken Institute of Public Health, sent a graduate student and his wife to six popular restaurants in Washington DC, where they discreetly cut off a sample of the seafood they ordered and brought it back to the lab for DNA species analysis. A third of the tested seafood wasn’t what it claimed to be. Of the 12 samples they brought back, four had been mislabeled: a Chilean sea bass, a rock shrimp and two tuna dishes. One of the tuna samples was from a species considered vulnerable and therefore likely to become endangered because of threats to its environment. The rock shrimp was swapped for whiteleg shrimp, which is a farm-raised shrimp. Crandall says the substitutions he found were legal, but they shortchanged consumers. The species listed on the menus are often premium varieties for which restaurants charge more. Swaps can occur anywhere from the fisherman to the restaurant, and it is not clear from this study whether the restaurants were aware of the mislabeling or not. Without genetic testing, it’s tough for people to tell if they’re getting what they paid for, says Crandall. But sticking with reputable establishments that stand by their ingredients, and are more transparent about their sourcing, could help protect buyers. ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/4754138/fish-fraud-mislabeled/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/4754138/fish-fraud-mislabeled/"},"headline":"Why the Fish You Order Isn't Always What You Get","datePublished":"2017-04-26T19:49:10.000Z","dateModified":"2026-02-23T04:35:30.438Z","description":"Seafood fraud, where cheaper species are mislabeled as more expensive ones, is rampant, according to a new study on restaurant fish.","url":"https://time.com/4754138/fish-fraud-mislabeled/","keywords":["Diet & Nutrition","fish","seafood","Tuna"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/blted2f3beab91b9d98/6988ca7e196cf43ec503fd1f/gettyimages-163399009.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Alice Park","jobTitle":"Senior Correspondent","url":"https://time.com/author/alice-park/"}],"articleSection":"Health","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/blted2f3beab91b9d98/6988ca7e196cf43ec503fd1f/gettyimages-163399009.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"Raw Blufin Tuna","caption":"Raw Blufin Tuna","creditText":"Greg Ceo—Getty Images","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/section/health/","name":"Health"}},{"@type":"ListItem","position":2,"item":{"@id":"/tag/dietnutrition/","name":"Diet & Nutrition"}},{"@type":"ListItem","position":3,"item":{"@id":"https://time.com/4754138/fish-fraud-mislabeled/","name":"Why the Fish You Order Isn't Always What You Get"}}]}] ```