Hexagrammidae is a family of fishes of the order Scorpaeniformes. 7 genera, 14 species, including one-line, brown, Japanese, spotted, one-perch, toothy terpuga, etc. The body is elongated, covered with fine scales. The body is elongated, covered with fine scales. Dorsal fin is single or divided by a notch into two parts. Lateral line is arranged in one or more rows. Marine, benthic or benthic-pelagic fish of the North Pacific Ocean. Eggs are laid on rocky substrates. Feed on mollusks, crustaceans, worms, fish. They are of great commercial importance.

Hexagrammidae have an elongated body covered with fine scales. Length is usually up to half a meter (in rare cases grow up to 1.5 meters and more), body weight up to one and a half to two kilograms (maximum - up to 60 kg). 

Dorsal fin solid, the entire back (in monotremes), or divided by a deep depression into 2 parts (sometimes because of this is considered that the fins are two). Anal fin long, at least 15 rays. 

The mouth is terminal, usually small. The anterior nostrils are well developed, the posterior nostrils are absent or severely reduced. On the parietal behind the eye on each side of the fringed leather lobe; some species have a second pair of small lobes on the back of the head. Some species have five lateral lines on each side of the body, others have only one. Some species are brightly colored.

Inhabit the North Pacific Ocean, lead predominantly benthic and coastal lifestyle. Gregarious fish, predators. They are the objects of commercial and sport fishing. Appreciated for their good taste and high fat content.