What is the gray stuff in shrimp?

Verified Answer
Sometimes when you buy raw shrimp you will notice a thin, black string down its back. Although removing that string is called deveining, it is actually not a vein (in the circulatory sense.) It is the shrimp's digestive tract, and its dark color means it is filled with grit.
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it is actually not a vein (in the circulatory sense.) It is the shrimp's intestinal tract, and its dark color means it is filled with grit or other feces. ... The decision to devein shrimp is basically a matter of personal preference and aesthetics, not hygiene, and the vein is not harmful to the human body if eaten..
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Sometimes when you buy raw shrimp you will notice a thin, black string down its back. Although removing that string is called deveining, it is actually not a vein (in the circulatory sense.) It is the shrimp's digestive tract, and its dark color means it is filled with grit.
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