Halibut n. : A large, northern, marine flatfish (Hippoglossus vulgaris), of the family Pleuronectidae. It often grows very large, weighing more than three hundred pounds. It is an important food fish.

Example:
What are the cheapest Halibut charters out of Seward, Alaska?

Taxonomy
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Defination from the web:
Halibut feed on almost any animal they can fit in their mouths. ... In most ecosystems the halibut is near the top of the marine food chain. In the North Pacific the only common predators of halibut are the sea lion (Eumetopias jubatus), the orca whale (Orcinus orca), and the salmon ...