These U-6 farmed white shrimp are among the largest shrimp sold at Costco, with fewer than 6 shrimp making up a full pound. The "U-6" designation stands for "under 6 count per pound," classifying these as colossal or extra-colossal shrimp — a size category rarely found at standard grocery retailers. Farm-raised white shrimp (Litopenaeus vannamei) are typically sourced from aquaculture operations in countries such as Ecuador, India, Thailand, or Vietnam. Sold fresh per pound at the Costco seafood counter, this product is generally previously frozen and thawed for display.

Due to their impressive size, U-6 white shrimp are especially well suited for grilling, seafood boils, shrimp cocktails, stuffed shrimp preparations, and any dish where the shrimp serves as a centerpiece. Their large, meaty flesh holds up well to bold seasonings, marinades, and high-heat cooking methods including broiling and pan-searing. As with most fresh-counter shrimp, they are sold shell-on and require peeling and deveining before cooking.