How to Identify Tiger Trout

To identify Tiger Trout (Salmo trutta x Salvelinus fontinalis), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Distinctive vermiculated (worm-like) patterns of dark brown or black on a lighter background of tan, olive, or yellowish-gold. The belly is typically lighter, often white or cream. The fins may have orange or reddish hues, particularly the anal and pectoral fins, sometimes with white leading edges on the pelvic and anal fins, inherited from the Brook Trout parent.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Unique labyrinthine or vermiculated pattern resembling tiger stripes, covering the entire body and fins., Adipose fin present, characteristic of salmonids., Sterile hybrid, unable to reproduce.

Dorsal fin

Single, soft-rayed dorsal fin, typically with 10-14 rays.

Tail fin

Slightly forked caudal fin.

Pectoral fin

Paired pectoral fins, typically with 12-15 rays.

Distinctive fins

Pelvic fins are abdominal. Adipose fin is present between the dorsal and caudal fins.

Identification Tips

1. 1

   Coloration and Pattern

   The most defining feature is the intricate, maze-like or vermiculated pattern of dark markings on a lighter background, resembling tiger stripes. This pattern is unique among trout species.

2. 2

   Fin Edges

   Look for white leading edges on the pelvic and anal fins, a trait inherited from the Brook Trout parent, though it may be less pronounced than in pure Brook Trout.

3. 3

   Body Shape

   Generally more streamlined than a Brook Trout but less so than a Brown Trout, reflecting its hybrid nature.

4. 4

   Absence of Red Spots

   Unlike many Brown Trout, Tiger Trout typically lack prominent red spots with halos on their flanks.

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