California Halibut

The California halibut is a large left-eyed flatfish in the family Paralichthyidae, native to the eastern Pacific from Washington State to Baja California, Mexico, with the greatest abundance off central and southern California. It is one of the larger flatfish species along the U.S. West Coast and is unusual among Paralichthyidae in that eye position can vary, with most individuals left-eyed but a notable minority right-eyed. California halibut are highly valued as a recreational and commercial sportfish target along the Pacific coast. They occupy shallow bays, estuaries, and nearshore sandy areas as juveniles before moving to somewhat deeper coastal waters as adults, making them one of the more accessible large flatfish for coastal anglers and divers to observe.

• Large, elongated oval body, less rounded than many other flatfish
• Eyes typically on the left side, though roughly 40% of individuals are right-eyed—unusual for the family
• Upper side is uniform brown, gray, or olive, sometimes with faint mottling, lacking bold spots
• Mouth is large with sharp teeth, extending well past the eye
• High arch in the lateral line above the pectoral fin
• Adults commonly reach 45-90 cm, with large individuals exceeding 1.2 m

The large mouth and mixed eye-sidedness separate it from other Pacific flatfish such as starry flounder, which has alternating black-and-white banded fins, and Pacific halibut, which is far larger and diamond-shaped with a smaller mouth.

California halibut range along the eastern Pacific coast from Washington State to the Baja California peninsula, with core populations concentrated in the Southern California Bight. Juveniles settle in shallow, protected bays, estuaries, and sandy nearshore flats, while adults move into slightly deeper coastal waters, typically from a few meters to about 100 meters. The species favors sandy or sand-mud bottoms near structure such as reefs, kelp beds, or eelgrass edges, where it can ambush prey while remaining partly camouflaged in the substrate.

California halibut are active, mobile predators, more prone to swimming and hunting off the bottom than many other flatfish. They ambush small fish, especially anchovies and other schooling species, often burying themselves partially in sand and darting upward to strike prey. Juveniles use shallow bays and estuaries as nursery habitat, offering protection from larger predators before moving to open coastal waters as they mature. Spawning occurs over sandy nearshore bottoms during warmer months, with pelagic eggs and larvae drifting before settling and undergoing the eye migration and flattening characteristic of flatfish development.