are a family, Embiotocidae
, of perciform
fishes. They are found in coastal waters of the northern Pacific
and grow up to 45 cm (17.7 inches) long.
They are viviparous fishes, in which the embryo is nourished directly by the mother as well as the yolk. This gives the family its scientific name, from Greek embios meaning "persistent" and tokos meaning "birth".
There are 22 species in 13 genera: