The “vein” of the shrimp: the culinary detail that few know and many discuss

That dark, thin line running along the back of a shrimp? It’s commonly called the “vein,” but it’s not a vein at all—and whether you should remove it depends on more than just aesthetics.

Let’s clear up the confusion once and for all.

🔍 What Is the “Vein”?
It’s the shrimp’s digestive tract—essentially its intestine.
The dark color comes from undigested food or waste (often algae or plankton).
There’s also a white “vein” along the underside—this is the actual nerve cord, not a blood vessel.
🦐 Fun fact: Shrimp have an open circulatory system—their “blood” (hemolymph) isn’t contained in veins like ours, so there’s no true “vein” to speak of.
✅ Should You Remove It?
Yes—if…
The shrimp is large (26/30 count or bigger)—the tract is more noticeable and can be gritty or bitter.
You’re serving shrimp peeled and butterflied (like in scampi or salads)—appearance matters.
You’re sensitive to texture or flavor—some detect a slight “muddy” taste if left in.
No—if…