How to Identify Redside Shiner

To identify Redside Shiner (Richardsonius balteatus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dorsal surface is typically olive-green to dark brown, fading to silvery sides and a white belly. A prominent reddish to orange lateral stripe runs from the operculum to the caudal peduncle, becoming more vibrant in breeding males. Scales are relatively large and reflective.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Prominent reddish lateral stripe (especially in breeding males), Deeply forked caudal fin, Relatively large scales for a minnow

Dorsal fin

Single dorsal fin, typically with 8-10 rays, originating slightly behind the pelvic fin origin.

Tail fin

Deeply forked caudal fin.

Pectoral fin

Pectoral fins are moderately sized, typically with 13-17 rays.

Distinctive fins

Anal fin is relatively long, with 10-16 rays, distinguishing it from many other shiner species.

Identification Tips

1. 1

   Lateral Stripe

   Look for the distinctive reddish to orange lateral stripe running along the sides, which is most vibrant during the breeding season. This stripe can be less pronounced or absent in non-breeding individuals or juveniles.

2. 2

   Anal Fin Ray Count

   Count the rays in the anal fin. Redside Shiners typically have 10-16 anal fin rays, which is a key diagnostic feature differentiating them from many other minnow species in their range.

3. 3

   Body Shape and Size

   Observe the slender, elongated body shape. Adults typically range from 7-12 cm (3-5 inches) in total length, though some individuals can reach up to 17 cm (7 inches).

4. 4

   Mouth Position

   Note the terminal mouth, indicating its feeding habits on surface and mid-water prey.

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