Largescale Stoneroller
  • Side view adult.
  • Side view adult.
  • Side view adult.
  • Top view a breeding male adult showing tubercles.
  • 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 region: The mouth is subterminal.
  • There are 41-48 lateral line scales, and 29-38 circumferential scales.
  • Close-up underside of mouth: The lower lip is catilaginous and chisel-like without barbels.
  • Close-up dorsal fin of a breeding male: There are 8 dorsal rays, and the dorsal fin has a pigment stripe; also notice the tubercles
  • Close-up dorsal fin of a breeding male: Notice the tubercles on the side, the orange color, and the dark stripe on the dorsal fin.
  • Close-up anal fin of a breeding male: Notice the orange color and the lack of a dark stripe on the anal fin.
  • Close-up head region of a breeding male: Notice the tubercles and a ridge on the lower jaw.
  • Side view of a breeding male: Breeding males develop an orange color and tubercles.
  • Top view of head region: Notice the tubercles.
  • Side view of a breeding male: Notice the intense orange color and the dark stripes on the dorsal fin.
  • Side view of a young-of-year: Juveniles are similar to adults, but with a more pronounced lateral stripe and a proportionally larger eye.
  • The intestine is elongate and highly convoluted; the peritoneum is black.
  • Side view of a largescale stoneroller X longnose dace hybrid: Notice the intermediate appearance; largescale stoneroller-like scales and pattern and longnose dace-like snout.
  • Close-up head region 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 longnose dace-like fleshy lips, but modestly developed largescale stoneroller-type ridge on the lower lip.
  • View of intestines of a largescale stoneroller X longnose dace hybrid: Notice the convoluted intestine but intermediate peritoneum of silvery (longnose dace ) and black (largescale stoneroller).
  • Side view of largescale stoneroller (top), longnose dace (bottom), and their hybrid.
DescriptionSimilar Species
Family
Minnows (Cyprinidae)
Body
Mouth and Snout: Mouth subterminal without any teeth. No barbels. Chisel-like cartilaginous rigde on lower jaw. No frenum connecting snout with fleshy upper lip. Body Pattern: Gray, brownish, or olive with small to medium dark blotches and mottling, often coalescing into a lateral stripe and grading to tan, cream, or yellowish white on belly. Fins generally clear, but dark stripe on dorsal fin in adults. Body Shape: Fusiform and robust, a flat oval in cross-section. Ventral area somewhat dorso-ventrally flattened. Typical adult size is 75-150 mm TL (3-6 in), with a maximum of about 200 mm (8 in).
Fins
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
Chisel-like cartilaginous ridge on lower jaw. 8 drosal rays. No barbels. 41-48 lateral line scales and 29-38 scale rows around body (sum of these two counts 70-86). See also similar species information.
Breeding Adults
Males have conspicuous barbels on head and most scales, fins and body reddish or orange with distinctive dark stripe on dorsal fin. Minor "hump" developes behind head.
Juveniles
Similar to adults.
Hybrids
Central X Largescale stoneroller; Largescale stoneroller X Longnose dace.
Compare Similar Species
Mouth
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
Barbels
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 WesternModerately similar
Dace, LongnoseModerately similar
Minnow, SuckermouthModerately similar
Stoneroller, CentralVery similar
Stoneroller, LargescaleN/A
Sucker, WhiteModerately similar
Comment
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.
Login