We describe good seafood as tasting “of the sea.” It sounds like something a menu writes to sell a dish — poetic, vague, a little romantic. But that taste is not a metaphor. It’s a specific set of molecules, and you can name every one of them.
Let me explain.
When you eat a cold-water shrimp and get that clean, savoury, faintly sweet “ocean” flavour, you’re tasting a small orchestra of compounds working together.
There’s glutamate — the same molecule behind the savoury depth of aged cheese and ripe tomatoes. It’s the source of umami, that full, mouth-filling savouriness. On its own, it’s already good. But in shrimp it doesn’t work alone.
Alongside it sit nucleotides — inosinate, guanylate, adenylate. These are the quiet amplifiers. Combined with glutamate, they don’t just add to umami; they multiply it, producing a savouriness far greater than either could reach on its own. It’s why the flavour feels deep rather than flat.
Then come glycine and alanine — free amino acids that bring the delicate natural sweetness cold-water shrimp are known for. And underneath it all, betaine and TMAO round out that unmistakable marine character.
Here’s the part worth pausing on.
Those last compounds — betaine, TMAO — aren’t there for our benefit. They’re survival chemistry. A shrimp living in cold, salty water needs to protect its cells from the constant osmotic pressure of the sea, and these molecules are part of how it does exactly that. They’re tools for staying alive in salt water.
Which leads to something quietly poetic after all: the “taste of the sea” is, quite literally, the taste of what it takes to live in the sea. The flavour isn’t added to the shrimp, and it isn’t a figure of speech. It’s the chemistry of survival in cold salt water — and we happen to experience it as delicious.
So the next time seafood is described as tasting “of the ocean,” it’s worth remembering the phrase is doing more than sounding nice.
It’s just accurate.
