California Halibut

Fascinating facts about the California Halibut

• A single California halibut can live up to 30 years, but most never make it past 15, and only females reach the older ages.
• When a baby halibut is a few weeks old, one of its eyes migrates over its head during a metamorphosis that occurs around 42 days post-hatching, ending up on the same side as the other eye.
• At just 22 inches long and about 4 pounds, a halibut reaches the legal catch size after 3 to 5 years, showing how quickly this predator can grow enough to support both commercial and recreational fisheries.
• The heaviest recorded California halibut tipped the scales at 72 pounds (32.7 kg), while most adults weigh between 6 and 30 pounds, illustrating a huge size range that fuels both sport and market demand.
• Spawning peaks first in Mexican waters and then moves northward each year.

At a glance

About the California Halibut

The California halibut (Paralichthys californicus) is a striking flatfish that drifts along the Pacific seafloor from the Quillayute River in Washington to Cabo Falsa in southern Baja California. Adults weigh between 6 and 30 lb (3–23 kg), with rare giants reaching 72 lb (32.7 kg) and lengths up to 60 in (1.52 m); most measure 12–24 in (30–61 cm). Their gray-brown bodies are peppered with darker spots, and they can shift hue and pattern to blend seamlessly with sand, mud, or gravel, a camouflage that doubles as a hunting cloak. Unlike most flatfish, the California halibut does not favor a single eye side; roughly equal numbers develop left- or right-eyed forms, a quirk that emerges during metamorphosis about 42 days after hatching when one eye migrates across the head. This ambush predator lies motionless on the benthic substrate, then darts upward to snatch schooling anchovies, market squid, shrimp, crabs, and a host of small fishes, positioning it as a cryptic top predator in its shallow-water realm, though it can venture as deep as 317 m.

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