Genus Hemitripterus is a group of fish native to the North Pacific Ocean. The most common synonym for this genus is the name "halfheads." Other synonyms for genus Hemitripterus include the names "grubfish," "greenling," and "bullheads." The halfheads are characterized by their distinct appearance, with a large head and a tapered body. They are predatory fish that feed on a variety of marine organisms, including crustaceans and other fish. The genus Hemitripterus contains several species, including the Pacific staghorn sculpin and the longfin snipefish, which are both popular game fish and are highly prized by anglers.