Shortjaw Cisco
  • 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 underside of head: The chin is moderately pigmented.
  • Close-up gill rakers: There are 35-44 (usually 38-42) short gill rakers.
  • Close-up pelvic fins: The pelvic fin length is short to medium and lacks pigment.
  • Close-up caudal region: There is an adipose fin.
  • The mouth is terminal and blunt, the lower jaw usually longer (rarely equal) than the upper; the snout is angled and moderately pigmented; the eye diameter is 30-40% of the head depth through the middle of the eye.
  • The species is moderately deep bodied, the deepest part is anterior to the dorsal origin; the belly is moderately rounded.
  • Head-on view: The body is relatively oval in cross section.
  • Alternate side view of a Wisconsin specimen.
  • Alternate side view of a Wisconsin specimen.
  • Alternate view of mouth and snout of a Wisconsin specimen.
  • Alternate view of pelvic fins of a Wisconsin specimen.
  • Alternate side view of an adult (overexposed photo).
DescriptionSimilar Species
Family
Trouts (Salmonidae)
Body
Mouth and snout: Terminal or slightly subterminal, oblique, a few minute teeth on jaws. No barbels. Body patterning, color, and scales: Solid color. Body color generally silvery, grading from brown, bronze or greenish on the back to silvery on the flanks to cream on the belly. 69-90 cycloid lateral line scales, usually 74-84. Fins without spots. Body shape and size: Body fusiform, moderately deep-bodied; oval in cross section. Typically 225-325 mm (9-13 in) TL; maximum about 400 mm (16 in).
Fins
Tail, dorsal and other fins: Forked tail. Single dorsal no spines and 10-11 principal rays, usually 10. Pelvic fins abdominal with axillary process. Adipose fin present. Anal fin with 10-13 principal rays, usually 11-12.
Distinguishing Characteristics
The shortjaw cisco can be distinguished by its terminal or slightly subterminal mouth, by its presence of an adipose fin, and by its presence of an axillary process of the pelvic fin. See also similar species information.
Breeding Adults
Males with numerous small tubercles on body, females with fewer.
Juveniles
Similar to adults.
Hybrids
None.
Compare Similar Species
Snout Shape and Pigment
BloaterUsually pointed, rarely blunt; light or moderate pigment
CiscoUsually pointed, rarely blunt; moderate pigment
Cisco, BlackfinUsually pointed, rarely blunt; dark pigment
Cisco, DeepwaterUsually pointed, sometimes blunt; moderate pigment
Cisco, ShortjawUsually blunt (angled), rarely pointed; moderate pigment
Cisco, ShortnoseUsually pointed, rarely blunt; moderate or dark pigment
KiyiUsually pointed, sometimes blunt; dark pigment
Chin Pigment
BloaterLight or moderate
CiscoLight or moderate
Cisco, BlackfinModerate
Cisco, DeepwaterLight
Cisco, ShortjawLight
Cisco, ShortnoseModerate
KiyiLight or moderate
Length of Upper Jaw Relative to Lower Jaw
BloaterUsually less, rarely equal
CiscoUsually equal, sometimes less, rarely more
Cisco, BlackfinUsually equal
Cisco, DeepwaterUsually equal
Cisco, ShortjawUsually more, rarely equal
Cisco, ShortnoseUsually equal, sometimes less
KiyiUsually less, rarely equal
Pelvic Fin Length and Pigment
BloaterMedium; no or light pigment
CiscoShort to medium; no or light pigment
Cisco, BlackfinUsually medium, rarely long; dark pigment
Cisco, DeepwaterMedium; no or light pigment
Cisco, ShortjawShort to medium; no or light pigment
Cisco, ShortnoseShort; no or light pigment
KiyiLong; no or light pigment
Eye Diameter
BloaterModerate
CiscoModerate
Cisco, BlackfinModerate
Cisco, DeepwaterModerate
Cisco, ShortjawModerate
Cisco, ShortnoseModerate to large
KiyiLarge
Gill Raker Number and Length
Bloater37-48, usually 41-44; usually medium, rarely short or long
Cisco41-55, usually 46-55; usually long, rarely medium
Cisco, Blackfin41-52, usually 46-50; long
Cisco, Deepwater26-36, usually 27-32; short
Cisco, Shortjaw35-44, usually 38-42; usually short, rarely medium
Cisco, Shortnose30-43, usually 34-38; short
Kiyi34-45, usually 36-41; usually medium, rarely long
Body Depth and Shape
BloaterDeep bodied, oval in cross-section, deepest part of body anterior to dorsal fin, sharply rounded belly
CiscoRelatively elongated, some fsh almost round in cross-section, deepest part of body usually near origin of dorsal fin, gently rounded belly
Cisco, BlackfinDeep bodied, oval in cross-section, deepest part of body anterior to dorsal fin, sharply rounded belly
Cisco, DeepwaterModerately deep bodied, oval in cross-section, deepest part of body just anterior to dorsal fin, moderately rounded belly
Cisco, ShortjawModerately deep bodied, oval in cross-section, deepest part of body just anterior to dorsal fin, moderately rounded belly
Cisco, ShortnoseModerately deep bodied, oval in cross-section, deepest part of body just anterior to dorsal fin, moderately rounded belly
KiyiRelatively elongated, oval in cross-section, deepest part of body usually near origin of dorsal fin, gently rounded belly
Similarity Index
BloaterVery similar
CiscoVery similar
Cisco, BlackfinVery similar
Cisco, DeepwaterVery similar
Cisco, ShortjawN/A
Cisco, ShortnoseVery similar
KiyiVery similar
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