observed luminescence in a piece of plaice A plaice fish bought for human feed has been cleaned and cooked. Some parts of the raw body have been left out of the fridge at about 22°C for about 15 hours. During the following night a luminescence phenomenon has been observed on the meat of the fish. !light_picture The second shot has been taken in a dark environment with a professional camera using a high sensitivity and long-time exposure. !dark_image What could it be?

It's probably bacteria.

Here's a pdf describing the phenomenon, along with an in-depth history of the reported occurrence, which should tell you everything you might want to know.

> These seafood products exhibited luminescence due to the presence of certain bacteria that are capable of emitting light. Luminescence by bacteria is due to a chemical reaction catalyzed by luciferase, a protein similar to that found in fireflies... Most of these species require salt except for the two nonmarine luminescent bacteria.

There is some link to potential pathogenicity, so I'd recommend **not** eating it. That document also requests that you contact the researcher, so why not? Here is a potentially-relevant paper but 1. is very old, 2. is in Russian, and 3. I have no access to it. And this supposedly tells you how to isolate them.