Longnose Dace
  • Side view adult.
  • Side view adult.
  • Side view adult.
  • Top view adult.
  • Bottom view adult.
  • Head-on view adult.
  • Close-up flank.
  • Close-up head.
  • Close-up mouth and snout.
  • Close-up tail.
  • Close-up dorsal fin.
  • Close-up anal fin.
  • Close-up pectoral fin.
  • Close-up pelvic fin.
  • Close-up head: Notice the overhanging snout and the inferior mouth.
  • The longnose dace has 61-75 lateral line scales and mottled sides.
  • Close-up underside of head: Notice the fleshy lips with small barbels at the corners of the mouth.
  • Close-up mouth: Notice the frenum; the upper lip and jaw are connected without a groove.
  • Side view of a breeding male: Breeding males develop a bright orange color.
  • Close-up head of a breeding male: Notice the bright color and the tubercles.
  • Side view of a young-of-year: Juveniles are similar to adults, but with a more pronounced lateral stripe.
  • Side view of a yearling: Juveniles are similar to adults; some Great Lakes specimens show this silvery coloration.
  • The intestine is relatively short, the peritoneum is silvery.
  • Side view of a largescale stoneroller X longnose dace hybrid: Notice the intermediate appearance, largescale stoneroller-like scales and pattern, but longnose dace-like snout.
  • Close-up head of a largescale stoneroller X longnose dace hybrid: Notice the largescale stoneroller-like scales, but the longnose dace-like elongated snout and inferior mouth.
  • Close-up mouth of a largescale stoneroller X longnose dace hybrid: Notice the longnoce dace-like fleshy lips, but the modestly developed largescale stoneroller-like ridge on the lower lip.
  • Intestine of a largescale stoneroller X longnose dace hybrid: Notice the convoluted intestine but the intermediate peritoneum of silver (longnose dace) and black (largescale stoneroller).
  • Comparison of the two parental species (largescale stoneroller, top, and longnose dace, bottom) and their hybrid in the middle.
DescriptionSimilar Species
Minnows (Cyprinidae)
Mouth and Snout: Mouth inferior without any teeth. Inconspicuous barbels at corners of the mouth. Thick fleshy lips with frenum connecting snout with lip. Snout greatly overhangs mouth. Body Pattern: Sides brown, dark olive, or dark gray with darker blotches and mottling often coalescing into an irregular lateral stripe anteriorly. Cream, silvery or yellow-white belly. Fins pigmented. Body Shape: Fusiform and elongate, almost round in cross-section with ventral area slightly dorso-ventrally flattened. Typical adult size is 75-100 mm TL (3-4 in), with a maximum of about 140 mm (5.5 in).
Forked tail. Single dorsal fin with 8 rays and no spines. Pelvic fins abdominal. No adipose fin. Anal fin with 7 rays and no spines.
Distinguishing Characteristics
Inferior mouth with fleshy lips and inconspicuous barbels at the corners. Frenum connection upper lip to snout. Compaired to blacknose dace, snout greatly overhangs mouth and body is less deep and more elongated. 61-75 cycloid lateral scales. About 54 scale rows around body. See also similar species information.
Breeding Adults
Males have small tubercles on head, scales, and pectoral. Both sexes get salmon, orange, or yellowish pigment around mouth, cheek, base of pectoral, pelvic, and caudal fin.
Similar to adults, but typically lateral stripe more pronouced, caudal spot present.
Longnose dace X creek chub; longnose dace X common shiner; longnose dace X central stoneroller; longnose dace X largescale stoneroller.
Compare Similar Species
Chub, GravelSubterminal mouth; thin fleshy lips; no frenum
Chub, ShoalInferior mouth; thin fleshy lips; no frenum
Chub, SilverSubterminal mouth; thin fleshy lips; no frenum
Dace, Blacknose WesternSubterminal mouth; thick fleshy lips; frenum present
Dace, LongnoseInferior mouth; thick fleshy lips; frenum present
Minnow, SuckermouthInferior mouth; thick fleshy lips; no frenum
Stoneroller, CentralSubterminal mouth; ridge on lower jaw; no frenum
Stoneroller, LargescaleSubterminal mouth; ridge on lower jaw; no frenum
Sucker, WhiteInferior mouth; thick fleshy lips; no frenum
Chub, GravelInconspicuous
Chub, ShoalShort but conspicuous
Chub, SilverInconspicuous
Dace, Blacknose WesternInconspicuous
Dace, LongnoseInconspicuous
Minnow, SuckermouthNone
Stoneroller, CentralNone
Stoneroller, LargescaleNone
Sucker, WhiteNone
Body Pattern
Chub, GravelX, W, & Y markings
Chub, ShoalPepper-like spots
Chub, SilverSolid silver
Dace, Blacknose WesternMottled and/or lateral stripe
Dace, LongnoseMottled and/or lateral strip
Minnow, SuckermouthLateral stripe (may be faint)
Stoneroller, CentralMottled and/or lateral stripe
Stoneroller, LargescaleMottled and/or lateral stripe
Sucker, WhiteSolid, spotted, or mottled
Lateral Line Scales
Chub, Gravel38-43
Chub, Shoal36-40
Chub, Silver37-47
Dace, Blacknose Western60-75
Dace, Longnose61-75
Minnow, Suckermouth43-51
Stoneroller, Central47-58
Stoneroller, Largescale41-48
Sucker, White39-115
Circumferential Scales
Chub, Gravel~ 32
Chub, Shoal~ 28
Chub, Silver~ 28
Dace, Blacknose Western~ 52
Dace, Longnose~ 54
Minnow, Suckermouth~ 34
Stoneroller, Central38-50
Stoneroller, Largescale29-38
Sucker, White~32-~90
Dorsal Rays
Chub, Gravel8
Chub, Shoal8
Chub, Silver8
Dace, Blacknose Western8
Dace, Longnose8
Minnow, Suckermouth8
Stoneroller, Central8
Stoneroller, Largescale8
Sucker, White9-15
Similarity Index
Chub, GravelModerately similar
Chub, ShoalModerately similar
Chub, SilverModerately similar
Dace, Blacknose WesternVery similar
Dace, LongnoseN/A
Minnow, SuckermouthModerately similar
Stoneroller, CentralModerately similar
Stoneroller, LargescaleModerately similar
Sucker, WhiteModerately similar
Sucker, WhiteAll suckers at the juvenile stage (Catostomidae: Catostomus, Hypentelium, Minytrema, Moxostoma) are moderately similar and all criteria as described for the white sucker apply.