CHUB (Leuciscus cephalus)  , a fish of the Cyprinid family, belonging to the same genus as the roach and dace . It is one of the largest of its family, attaining a length of 2 ft. and a weight of 5 to 7 lb . It does not avoid running waters, and is fond of insects, taking the fly readily, but its flesh, like that of the other Leucisci, is tasteless and full of bones . It is common in Great Britain and the continent of Europe . In America the name of " chub " is given to some other members of the family, and commonly to the horned dace (Semnotilus atromaculatus); well-known varieties are the river chub (Hybopsis kentuckiensis) and Columbia river chub (Mylochilus caurinus) .