mackerel plow (makerelplou)

A knife used for creasing the sides of lean mackerel to make them resemble fish of the first quality. Also called fatting - knife. A car an mackerel-scad (mak'e-rel-skad), n. goid fish of the genus Dec apter us, as D. macarel lus, of a silvery color, plumbeous below, with a black spot on the opercle and nearly straight lateral line, inhabiting warm parts of the Atlantic and northward to New England.