|Rock shrimps resemble penaeid shrimps in size and body shape but are easily distinguished from them by their thick rigid stony carapace. They are nocturnal and are usually found in deeper waters than most commercially caught shrimp. These shrimps were generally not targeted by commercial fishermen because their hard shells made them hard to process in large-scale. In 1969 a Florida man invented a machine that would peel and devein the rock shrimps. Since then there have been directed fisheries to catching these shrimps, although most of it in the Gulf of Mexico is centered around Florida. The rock shrimps are said to have a sweet taste, similar to lobster. There are 2 rock shrimps in Texas waters, the brown and the lesser rock shrimp.