What makes shrimp glow in dark?

Marine bacteria can cause glowing or luminescence when they grow on seafood products - a trait that may be exacerbated by the adding of salt during processing. The important thing to remember, she said, is that "glowing" seafood does not present a food safety problem, nor does it reflect mishandling during processing.

today.oregonstate.edu - Glow-in-the-dark shrimp? Don't fret, say seafood safety experts...

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NEWPORT, Ore. - Some Oregonians who recently purchased pink shrimp at the coast or at large retail stores have called Oregon State University's Lincoln County Extension Office over the past few days to report a rather unusual trait.

Their seafood was glowing in the dark.

What sounds other-worldly is actually surprisingly common, according to Kaety Hildenbrand, an OSU Sea Grant Extension specialist who works with coastal fishing communities. Marine bacteria can cause glowing or luminescence when they grow on seafood products - a trait that may be exacerbated by the adding of salt during processing. The important thing to remember, she said, is that "glowing" seafood does not present a food safety problem, nor does it reflect mishandling during processing. "This is a situation that pops up on occasion and this seems to be a banner year for glowing seafood," she said. "One person turned her lights off to watch a movie and her shrimp salad started to glow. Another man left his pink shrimp on the counter to thaw, and when he got up, it was glowing in the sink. "People are calling to ask about safety and we're assuring them there's nothing wrong with their seafood," she added. "I've even seen glow-in-the-dark salmon before." One reason many people haven't seen luminescent seafood is that they rarely prepare cooked shrimp, crabmeat and other products in the dark. According to the University of California Sea Grant Extension program, there are numerous marine bacteria that can cause luminescence, including Alternomonas hanedai, Photobacterium phosphoreum, P. leiognathi, Vibrio fischeri, V. harveyi, V. logei and V. splendidus. Some can grow at refrigerator temperatures - especially on seafood products where salt has been added during processing. Such bacterial growth is normal, said OSU Sea Grant Extension specialist Jeff Feldner, a former commercial fisherman. "These occurrences actually have gone on for years," he said, "and there haven't been reports of illness from luminous marine bacteria." The OSU Extension specialists suggest consumers keep cooked seafood products chilled at temperatures as close to 32 degrees as possible, and to consume these products within a day or two of purchase.

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How do you get the fishy taste and smell out of shrimp?

We've found an easy way to eliminate the smell: Soak the fish or the shellfish meat in milk for 20 minutes and then drain and pat dry. The casein in milk binds to the TMA, and when drained away, it takes the culprit that causes fishy odor with it. The result is seafood that's sweet smelling and clean-flavored.

americastestkitchen.com - Fix for ""Fishy"" Seafood | Cook's Illustrated - America's Test Kitchen

Unless the fish or seafood you’ve bought is literally the catch of the day, chances are it will smell and taste at least a little fishy, thanks to a compound found in nearly all seafood called trimethylamine oxide, or TMAO. This compound is odorless when fish and shellfish are alive, but once they’re killed, TMAO slowly transforms into TMA (trimethylamine), which has a fishy odor. But that doesn’t mean that the seafood has gone bad or is unusable. We’ve found an easy way to eliminate the smell: Soak the fish or the shellfish meat in milk for 20 minutes and then drain and pat dry. The casein in milk binds to the TMA, and when drained away, it takes the culprit that causes fishy odor with it. The result is seafood that’s sweet smelling and clean-flavored.

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