Lactate Dehydrogenase Isozymes in Longnose and Blacknose Dace (Rhinichthys cataractae and R. atratulus) and Their Hybrid

Abstract

Electrophoresis of tissue extracts of both longnose and blacknose dace reveals five isozymes corresponding to tetramers of heart and muscle type subunits. The species are readily distinguished by the greater electrophoretic mobility of longnose dace isozymes that contain heart type subunits. The F1 hybrid displays the multiple band pattern expected in a fish able to produce two kinds of heart subunit. In addition a variant type of muscle lactate dehydrogenase has been detected in the longnose dace.