 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).
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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.
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Snout Shape and Pigment | | Bloater | Usually pointed, rarely blunt; light or moderate pigment | | Cisco | Usually pointed, rarely blunt; moderate pigment | | Cisco, Blackfin | Usually pointed, rarely blunt; dark pigment | | Cisco, Deepwater | Usually pointed, sometimes blunt; moderate pigment | | Cisco, Shortjaw | Usually blunt (angled), rarely pointed; moderate pigment | | Cisco, Shortnose | Usually pointed, rarely blunt; moderate or dark pigment | | Kiyi | Usually pointed, sometimes blunt; dark pigment | Chin Pigment | | Bloater | Light or moderate | | Cisco | Light or moderate | | Cisco, Blackfin | Moderate | | Cisco, Deepwater | Light | | Cisco, Shortjaw | Light | | Cisco, Shortnose | Moderate | | Kiyi | Light or moderate | Length of Upper Jaw Relative to Lower Jaw | | Bloater | Usually less, rarely equal | | Cisco | Usually equal, sometimes less, rarely more | | Cisco, Blackfin | Usually equal | | Cisco, Deepwater | Usually equal | | Cisco, Shortjaw | Usually more, rarely equal | | Cisco, Shortnose | Usually equal, sometimes less | | Kiyi | Usually less, rarely equal | Pelvic Fin Length and Pigment | | Bloater | Medium; no or light pigment | | Cisco | Short to medium; no or light pigment | | Cisco, Blackfin | Usually medium, rarely long; dark pigment | | Cisco, Deepwater | Medium; no or light pigment | | Cisco, Shortjaw | Short to medium; no or light pigment | | Cisco, Shortnose | Short; no or light pigment | | Kiyi | Long; no or light pigment | Eye Diameter | | Bloater | Moderate | | Cisco | Moderate | | Cisco, Blackfin | Moderate | | Cisco, Deepwater | Moderate | | Cisco, Shortjaw | Moderate | | Cisco, Shortnose | Moderate to large | | Kiyi | Large | Gill Raker Number and Length | | Bloater | 37-48, usually 41-44; usually medium, rarely short or long | | Cisco | 41-55, usually 46-55; usually long, rarely medium | | Cisco, Blackfin | 41-52, usually 46-50; long | | Cisco, Deepwater | 26-36, usually 27-32; short | | Cisco, Shortjaw | 35-44, usually 38-42; usually short, rarely medium | | Cisco, Shortnose | 30-43, usually 34-38; short | | Kiyi | 34-45, usually 36-41; usually medium, rarely long | Body Depth and Shape | | Bloater | Deep bodied, oval in cross-section, deepest part of body anterior to dorsal fin, sharply rounded belly | | Cisco | Relatively elongated, some fsh almost round in cross-section, deepest part of body usually near origin of dorsal fin, gently rounded belly | | Cisco, Blackfin | Deep bodied, oval in cross-section, deepest part of body anterior to dorsal fin, sharply rounded belly | | Cisco, Deepwater | Moderately deep bodied, oval in cross-section, deepest part of body just anterior to dorsal fin, moderately rounded belly | | Cisco, Shortjaw | Moderately deep bodied, oval in cross-section, deepest part of body just anterior to dorsal fin, moderately rounded belly | | Cisco, Shortnose | Moderately deep bodied, oval in cross-section, deepest part of body just anterior to dorsal fin, moderately rounded belly | | Kiyi | Relatively elongated, oval in cross-section, deepest part of body usually near origin of dorsal fin, gently rounded belly | Similarity Index | | Bloater | Very similar | | Cisco | Very similar | | Cisco, Blackfin | Very similar | | Cisco, Deepwater | Very similar | | Cisco, Shortjaw | N/A | | Cisco, Shortnose | Very similar | | Kiyi | Very similar |
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