The dark line running along a shrimp’s back is its digestive tract, commonly called the vein. It isn’t a blood vessel, and finding it in cooked shrimp doesn’t automatically mean the food is unsafe.
What happens if you eat shrimp that hasn’t been deveined?
When shrimp are fresh, properly handled, and thoroughly cooked, accidentally eating the digestive tract is generally not harmful. However, there are a few things worth knowing:
- Texture: The tract can sometimes contain gritty material, including sand.
- Taste: Larger shrimp may have a slightly unpleasant or bitter taste if the tract is left intact.
- Appearance: Some people find the dark line unappetizing.
- Food safety: Removing the tract doesn’t replace proper refrigeration, handling, and cooking.
What about shrimp cooked with their shells on?
Cooking shrimp with their shells is common in many cuisines. The shells help retain moisture and can add flavor.
Some cooks remove the digestive tract before cooking while leaving the shell intact. Others cook the shrimp whole and let guests peel and clean them at the table.
Both approaches are common.
How to devein shrimp properly
- Rinse the shrimp briefly under cold running water.Buy Fresh Seafood
- Use a small knife or kitchen scissors to make a shallow opening along the back.
- Gently lift out the dark digestive tract with the knife tip or a toothpick.
- Cook the shrimp until the flesh is firm, pearly, and opaque, reaching 145°F (63°C).
For children, remove the shells before serving and check for any remaining pieces.
The bottom line
Your mother-in-law wasn’t necessarily doing anything wrong by cooking shrimp with their shells on and leaving the digestive tract intact.
Deveining is mostly a matter of preference, not an absolute food-safety requirement. The most important factors are freshness, proper storage, avoiding cross-contamination, and thorough cooking.
If you prefer your shrimp deveined, that’s completely reasonable too.