How to Identify Utah Sucker

To identify Utah Sucker (Catostomus ardens), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dorsal surface typically dark olive to brownish-gray, fading to lighter olive or silvery-white on the ventral side. Sides may have a brassy or coppery sheen, especially during spawning. Fins are usually dusky.

Scale type

cycloid

Mouth position

subterminal

Distinctive features

Large, robust body, typically reaching 30-60 cm (12-24 inches) in length, with some individuals exceeding 70 cm (28 inches)., Subterminal mouth with thick, papillose lips, characteristic of suckers, adapted for bottom feeding., Relatively small eyes., Lateral line complete, with 65-85 scales., Dorsal fin typically has 11-13 rays., No scales on the head.

Dorsal fin

Single, relatively long dorsal fin, typically with 11-13 soft rays. Originates slightly anterior to the pelvic fin origin.

Tail fin

Moderately forked caudal fin.

Pectoral fin

Pectoral fins are relatively large and low-set.

Distinctive fins

Pelvic fins are abdominal, located well behind the pectoral fins. Anal fin is short, with 7-8 rays.

Identification Tips

1. 1

   Mouth Structure

   Observe the subterminal mouth with thick, fleshy, papillose lips. This is a key characteristic of all Catostomidae, but the specific papillae pattern can help distinguish it from other suckers.

2. 2

   Scale Count

   Count the scales along the lateral line (65-85) and the dorsal fin rays (11-13). These counts are important for differentiating it from other Catostomus species.

3. 3

   Body Shape and Coloration

   Note the robust, elongated body and the typical dark olive to brownish-gray dorsal coloration with lighter ventral side. Spawning individuals may exhibit a brassy sheen.

4. 4

   Geographic Location

   Confirm the fish was caught within the Bonneville Basin, as its range is restricted to this area.

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