Rudd
  • 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 gill rakers: There are 8-13 gill rakers.
  • Close-up keel area: The keel is scaled between the vent and pelvic fins.
  • Close-up mouth: Notice that the mouth is superior.
  • Close-up flank: The scales are rounded; there are 37-47 scales in the lateral line, which is strongly decurved.
  • Close-up anal fin: There are 11 rays in the anal fin, with a range of 11-13.
  • Close-up dorsal fin: The dorsal fin is reddish with 9 rays, with a range of 9-11.
  • Comparison rudd (top) and golden shiner (bottom): Notice the larger size and the red fins of the rudd.
  • Close-up of head region: Notice the bright red of the fins.
  • Close-up of tail region: Notice the bright red of the fins.
DescriptionSimilar Species
Family
Minnows (Cyprinidae)
Body
Mouth and Snout: Superior without any teeth or barbels. Body Pattern: Solid golden, silver, or light olive. Fins red or orange. Body Shape: Body deep and laterally compressed; oval in cross-section. Typically 100-250 mm TL (4-10 in); maximum reported about 360 mm (14 in).
Fins
Forked tail. Single dorsal fin with 9-11 rays and no spines. Pelvic fins abdominal. No adipose fin. Anal fin with 11-13 rays and no spines.
Distinguishing Characteristics
All fins red or orange. Dorsal fin rays 9-11. 37-47 (usually less than 42) cycloid lateral line scales. 8-13 gill rakers. Scaled keel. See also similar species information.
Breeding Adults
Males - head and body with fine tubercles.
Juveniles
Similar to adults, but red or orange fin coloration is less developed and may be absent in specimens < 38 mm TL (1.5 in).
Hybrids
None known from Wisconsin.
Compare Similar Species
Lateral Line
Rudd37-47 rounded scales; lateral line strongly decurved
Shiner, Common34-40 highly elevated scales; lateral line decurved
Shiner, Golden42-54 rounded scales; lateral line strongly decurved
Shiner, Red32-36 diamond-shaped scales; lateral line slightly decurved
Shiner, Spotfin35-39 diamond-shaped scales; lateral line slightly decurved
Shiner, Striped34-40 highly elevated scales; lateral line decurved
Anal Fin
Rudd11-13 rays
Shiner, CommonUsually 9 rays, rarely 8 or 10
Shiner, Golden11-15 rays
Shiner, RedUsually 9 rays, rarely 8 or 10
Shiner, Spotfin8 rays
Shiner, StripedUsually 9 rays, rarely 8 or 10
Dorsal Fin
Rudd9-11 rays; membranes lack dark pigment but fin (including membranes) is red in adults
Shiner, Common8 rays; membranes generally unpigmented, rays outlined with dark pigment in breeding males
Shiner, Golden8 rays (rarely 7 or 9); membranes generally unpigmented; fin light olive or yellowish
Shiner, Red8 rays; all membranes with uniform dark pigment
Shiner, Spotfin8 rays; membranes of last 2-3 rays pigmented; blotch-like in adults, a few speckles in juveniles
Shiner, Striped8 rays; membranes generally unpigmented, rays outlined with dark pigment in breeding adults
Other Diagnostic Features
RuddScaled keel in front of vent; 8-13 gill rakers
Shiner, CommonUsually 25-32 (21-37) predorsal scales; little chin pigment
Shiner, GoldenScaleless keel in front of vent; 16-21 gill rakers
Shiner, RedSnout blunter and body deeper than spotfin shiner
Shiner, SpotfinSnout more pointed and body not as deep as red shiner
Shiner, StripedUsually 16-19 (13-23) predorsal scales; chin 1/3 pigmented
Similarity Index
RuddN/A
Shiner, CommonModerately similar
Shiner, GoldenVery similar
Shiner, RedModerately similar
Shiner, SpotfinModerately similar
Shiner, StripedModerately similar
Comments
RuddNot established in WI. There is a very slight chance that a survivor from past bait-bucket introductions may be encountered.
Shiner, RedNot native to WI; may occur here as a stray from populations further south.
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