How to Identify European Grayling

To identify European Grayling (Thymallus thymallus), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

The body is generally silvery-grey to olive-brown on the back, fading to silvery-white on the belly. Sides often exhibit longitudinal rows of small, dark spots. During spawning, males can display more vibrant colors, including iridescent blue-green flanks and reddish-orange fins. The large dorsal fin is often adorned with rows of reddish-brown or purplish spots and a reddish margin.

Scale type

cycloid

Mouth position

subterminal

Distinctive features

Very large, sail-like dorsal fin, particularly prominent in males., Small, pointed mouth with fine teeth., Adipose fin present (characteristic of salmonids)., Distinctive thyme-like scent when freshly caught.

Dorsal fin

Single, exceptionally large and high, with 17-24 rays. It is much longer than it is high, especially in mature males, extending almost to the adipose fin.

Tail fin

Moderately forked, with 18-20 rays.

Pectoral fin

Relatively small, positioned low on the body, with 13-16 rays.

Distinctive fins

The adipose fin is small and fleshy, located between the dorsal and caudal fins. Pelvic fins are located abdominally, with 10-12 rays. Anal fin has 11-15 rays.

Identification Tips

1. 1

   Dorsal Fin

   The most striking feature is the exceptionally large, high, and often colorful dorsal fin, especially in adult males. It is much larger than that of trout or salmon.

2. 2

   Body Shape and Coloration

   Streamlined body, generally silvery-grey to olive-brown with small dark spots on the flanks. The overall impression is more slender and elegant than a trout.

3. 3

   Mouth

   Small, pointed mouth with fine teeth, positioned slightly inferiorly, adapted for picking insects from the substrate or water column.

4. 4

   Scent

   Freshly caught grayling often emit a distinct aroma, frequently described as smelling of thyme or cucumber.

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