Diamond turbot. Species: Hypsopsetta guttulata. Common names: Diamond turbot, turbot, diamond flounder, flounder.

Identifying Characteristics and Biology

  • Diamond turbots are right-eyed flat fish with an overall diamond-shape.
  • The top side ranges from light green, to green-brown, to brown, with bright blue spots.
  • They have a yellowish patch on the bottom (blind) side, near the mouth.
  • Once landed, the top colors turn almost black. 
  • They have a high salinity tolerance.
  • They max out in size at around 18 inches in length and 4 pounds in weight.

Range and Habitat

  • This Pacific species is found from Cape Mendocina, Northern California, to the Baja California, Mexico and the Gulf of California.
  • The range from the surf zone to over 150 feet deep.
  • Diamond turbots live in bays, river mouths, surf zones and intertidal ways, where there are muddy or sandy bottoms, typically close to a structure.

Market Forms

  •  While diamond turbots aren’t major sportfishing catch, they are of excellent food quality.


For Diamond Turbot individual daily bag and possession limit, size limit, fillet length, skin requirement at sea, and gear restrictions or methods of intake, visit the link to the California Sport Fishing Regulations 2014-2015, Ocean Edition – Page 104 in the printed book – see below:

2014 – 2015 Ocean Sportfishing Regulations


Love, Milton. Probably More Than You Want to Know About the Fishes of the Pacific Coast. Santa Barbara: Really Big Press, 1996. Print.

State of California. California Finfish and Shellfish Identification Book. N.p.: California Department of Fish and Game, 2007. Print.

John Shelton, the Fishing Chef, will help you get ‘that’ fish onto ‘your’ plate. John’s motto is ‘release it unharmed or do it justice on the plate.’ Executive Chef, photographer, and surfer, John photographs ocean marine life when he's out fishing, and creates masterpieces in the kitchen with what he keeps on deck. His photo works have been used in OEHHA Fish Advisories, National Geographic presentations, and nonprofit marine life groups. When he's not fishing, he's making great BBQ. Visit him at johnsheltondesigns.com, and send him a message using the contact form using the link above.