Elongated: head broad; snout blunt and rounded: upper jaw longest: anal, pectorals, and ventrals, red.
That of the specimen described below was six inches and a half: gets to a larger size.
(Form). "Body slender in proportion to its length: the head, compared with the length of the head and body alone, without the caudal rays, as two to nine: depth of the body equal to the length of the head: diameter of the eye compared with the length of the head as two to seven: nose rather rounded: upper jaw longest: the ascending line of the nape and back more convex than any other portion of the dorsal or abdominal line: the first ray of the dorsal fin arising half-way between the anterior edge of the orbit of the eye, and the edge of the fleshy portion of the tail; the first ray half as long as the second, which is the longest, and is as long again as the last ray of this fin, the length of the last ray being equal to the length of the base of the fin: the pectoral fin rather long and narrow: ventrals arising just in advance of the line of the origin of the first ray of the dorsal fin; the distance from the origin of the ventrals to the origin of the anal fin, and from the origin of the last ray of the anal fin to the end of the fleshy portion of the tail, equal; the first ray of the anal fin nearly as long again as the last: tail considerably forked, the external rays being as long again as those in the centre: scales of the body moderate in size, fifty forming the lateral line, with an oblique row of seven scales above it under the dorsal fin, and four below it; the lateral line itself concave to the dorsal line throughout its whole length.
D. 9; A. 10; C. 19; P. 16; V. 9.
(Colours). Top of the head, nape, and back, dusky blue, becoming brighter on the sides, and passing into silvery white on the belly: dorsal and caudal fins dusky brown; pectoral, ventral, and anal fins, pale orange-red: irides orange: cheeks and opercle silvery white." Yarr.
A single individual of this species was obtained by Mr. Yarrell in August 1831, whilst fishing in the Thames below Woolwich. No other has hitherto occurred in this country. According to Bloch, it prefers clear rivers and large lakes, in which it deposits its spawn in the months of March and April. Food, worms and aquatic mollusca. In general appearance it somewhat resembles the last species, but is much less deep for its length, and darker in colour. Said rarely to exceed half a pound in weight.