How to Identify Sacramento Perch

To identify Sacramento Perch (Archoplites interruptus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Variable, typically dark olive to brownish-black on the back, fading to lighter flanks with irregular, dark blotches or vertical bars. The belly is usually whitish. Some individuals may exhibit a purplish sheen. Juveniles often have more pronounced barring.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Deep, compressed body, Large mouth extending to or beyond the anterior margin of the eye, Irregular dark blotches or vertical bars on flanks, Single dorsal fin with a continuous membrane, but distinctly notched between spinous and soft-rayed portions, Absence of a distinct opercular spot (unlike many other sunfish)

Dorsal fin

Single, continuous dorsal fin with 10-13 strong spines followed by 10-12 soft rays. The spinous and soft-rayed portions are deeply notched.

Tail fin

Slightly emarginate to truncate caudal fin.

Pectoral fin

Rounded pectoral fins.

Distinctive fins

Pelvic fins are thoracic, located directly below or slightly anterior to the pectoral fins, with one spine and five soft rays. Anal fin has 5-7 spines and 9-11 soft rays.

Identification Tips

1. 1

   Body Shape

   Look for a deep, laterally compressed body, typical of sunfish.

2. 2

   Coloration and Markings

   Observe the dark olive to brownish-black back with irregular dark blotches or vertical bars on the sides. The belly is lighter.

3. 3

   Dorsal Fin

   Note the single dorsal fin that is deeply notched between the spiny and soft-rayed portions. This is a key feature distinguishing it from bass.

4. 4

   Mouth Size

   The mouth is relatively large, extending to or slightly beyond the anterior margin of the eye.

5. 5

   Opercular Spot

   Absence of a distinct black opercular spot, which is present in many other sunfish species.

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