• 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 belly: The scales along the midline between vent and pelvic fins are enlarged and toothed.
  • Close-up dorsal fin: Notice the dusky lateral bands and 13-15 spines.
  • Close-up tail: There are 24-37 scales around the caudal peduncle.
  • There are 15-25 narrow vertical bars on each side, 71-79 lateral line scales, and a conical protuberance on the snout.
  • Close-up mouth: The mouth is small, subterminal and without obvious teeth; there is a conical protuberance.
  • Close-up flank: There are 15-25 narrow vertical bars on each side and 71-79 lateral line scales.
DescriptionSimilar Species
Perches (Percidae)
Mouth and snout: Mouth subterminal and horizontal with minute teeth on jaws. No barbels. Body patterning, color, and scales: Back and sides brown, tan, or olive with 15-25 thin dark vertical bars of uneven lengths on sides and back (zebra- or tiger-like); belly cream or white. Second dorsal and caudal fins with dusky bars; other fins lightly pigmented, yellowish in life. 71-79 ctenoid lateral scales. Body shape and size: Body fusiform to cylindrical and elongated; round to oval in cross section. Typically 100-125 mm (4-5 in) TL; maximum about 175 mm (7 in).
Tail, dorsal and other fins: Square to very slightly forked tail. Dorsal fin with 2 lobes, distinctly separate, the first with 13-15 spines and the second with 14-16 (usually 14) rays. Pelvic fins thoracic. Adipose fin absent. Anal fin with 2 spines and 9-11 (usually 10) rays.
Distinguishing Characteristics
The logperch can be distinguished from by its small-to-moderate (not extending beyond the anterior of eye) terminal or subterminal mouth without obvious canine teeth, the presence of one or more enlarged and heavily toothed scales between the pelvic fins, plus usually a row of enlarged toothed scales along the midline in males and a partially naked belly in females. See also similar species information.
Breeding Adults
Similar to non-breeders; males have nearly microscopic tubercles on scales.
Similar to adults.
Logperch X blackside darter reported from Wisconsin.
Compare Similar Species
Darter, BlacksideRounded, not elongated
Darter, GiltRounded, not elongated
Darter, RiverRounded, not elongated
Darter, SlenderheadPointed, elongated
LogperchConical protuberance, somewhat elongated
Body Pattern
Darter, Blackside6-11 oval blotches along lateral line, stripe-like, blotches or saddles on back
Darter, Gilt5-8 thick squarish vertical bars or blotches extending onto back
Darter, River8-11 blotches, thick and irregular in back, grading to thin vertical bars in front
Darter, Slenderhead10-16 blotches or irregular vertical bars on sides, back
Logperch15-25 narrow vertical bars
1st Dorsal Fin Pigmentation
Darter, BlacksideSolid pigment on lower half, grading to dusky on outer third, thin light edge
Darter, GiltSolid pigment, orangish in life, except for thin clear/white edge
Darter, RiverDusky, with small dark blotch in front, larger dark blotch on posterior membranes
Darter, SlenderheadDark pigment on lower 1/2, then orange (in life), then dark band, then light edge
LogperchDusky lateral bands on light background
Lateral Line Scales
Darter, Blackside56-68
Darter, Gilt61-71
Darter, River48-60
Darter, Slenderhead65-71
Other Characteristics
Darter, Blackside~10 long gill rakers, 20-23 CP scales, 12-15 D1 spines
Darter, Gilt~11 long gill rakers, 24-29 CP scales, 11-12 D1 spines
Darter, River~9 short gill rakers, 19-24 CP scales, 10-12 D1 spines
Darter, Slenderhead~10 short gill rakers, 23-25 CP scales, 12-13 D1 spines
Logperch~12 short gill rakers, 24-37 CP scales, 13-15 D1 spines
Similarity Index
Darter, BlacksideVery similar
Darter, GiltVery similar
Darter, RiverVery similar
Darter, SlenderheadVery similar
Darter, BlacksideCP=caudal peduncle, D1=1st dorsal fin
Darter, GiltCP=caudal peduncle, D1=1st dorsal fin
Darter, RiverCP=caudal peduncle, D1=1st dorsal fin
Darter, SlenderheadCP=caudal peduncle, D1=1st dorsal fin
LogperchCP=caudal peduncle, D1=1st dorsal fin