K14-grade PRL (Pure Red Line) shrimp are a premium selectively bred variant of the Crystal Red Shrimp. They are prized for their intense red coloration, solid opaque white coverage, thick shell quality, and desirable features such as a well-defined red crown pattern. The K14 designation is used by some breeders to identify shrimp exhibiting exceptionally high genetic purity, color stability, and aesthetic quality within a Pure Red Line breeding program.