Ridgeback shrimp (Sicyonia ingentis) occur from Monterey, California to Cedros Island, Baja California. They are found at depths from less than 145 feet to 525 feet. Their maximum life span is five years. The Seafood Network Information Center Ridgeback shrimp are, technically, prawns. They are more tender and juicy than the famed spot prawns (themselves technically shrimp). Ridgeback shrimp are available in Southern California in June, and are mainly fished out of the Santa Barbara channel. Ridgeback shrimp are notoriously tough to peel, but aficionados know they are worth the effort. Molly Watson
There is about another 2 weeks that ridge backs will be showing up at the fishermans market, so get them while you can!