This large flatfish may weigh over 450 lbs (204 kg). The largest Pacific halibut are female, who may live up to 42 years old. A dedicated bottom fish, halibut live with their pale white side on the seabed while their other side is colored to camouflage with the gravel, mud, or sand in which they live.
When first born, halibut are shaped like other fish with one eye on each side. As they mature, the halibut undergoes metamorphosis with one eye slowly moving to join the other on one side. As a juvenile, they spend time in the water column before settling on the bottom to live as ambush predators.