How to Identify Razorback Sucker

To identify Razorback Sucker (Xyrauchen texanus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dorsal surface typically dark olive to black, fading to a lighter, often yellowish or white ventral surface. Fins are usually dusky.

Scale type

cycloid

Mouth position

subterminal

Distinctive features

Prominent, sharp, bony keel (razorback) on the dorsal surface behind the head, extending to the dorsal fin origin., Large, subterminal mouth with fleshy lips., Relatively small eyes., Deeply forked caudal fin.

Dorsal fin

Single dorsal fin, typically with 12-14 rays, located posterior to the razorback.

Tail fin

Deeply forked caudal fin.

Pectoral fin

Moderately sized, positioned low on the body.

Distinctive fins

Pelvic fins are abdominal.

Identification Tips

1. 1

   Dorsal Keel

   The most distinguishing feature is the sharp, bony ridge or 'razorback' on its back, immediately behind the head and extending to the dorsal fin. No other North American sucker species possesses such a prominent keel.

2. 2

   Mouth Position

   Possesses a large, subterminal mouth with thick, fleshy lips, indicative of its bottom-feeding habits.

3. 3

   Body Shape and Size

   A large, robust fish with an elongated body, capable of reaching lengths over 90 cm (35 inches) and weights exceeding 6 kg (13 pounds).

4. 4

   Coloration

   Generally dark olive to black dorsally, fading to a lighter, often yellowish or white belly.

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