Sand Vein
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The Sand Vein is nickname for the digestive tract of the Shrimp, which is typically removed when Peeling & Deveining Shrimp.  The Sand Vein is a little white & green string located just under the shell and skin of the back of the Shrimp (the side opposite the legs).

The Sand Vein, also known as the “Main Vein” and the “Mudline” is typically gritty and off tasting, so it is normally removed before cooking and eating Shrimp.

The Blood Vein, a smaller vein-like organ on the front of the Shrimp, nearer the legs, is usually ignored. It contains no grit, has very little substance and is usually not noticed if it is ignored.