How to Identify Japanese Char

To identify Japanese Char (Salvelinus leucomaenis), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Highly variable depending on subspecies, habitat, and age. Generally, the back is dark olive to brownish-green, fading to silvery-white on the belly. The flanks are adorned with numerous distinct, round to oval, white or cream-colored spots, often with a reddish or orange halo, particularly prominent in freshwater forms. Some forms may have faint parr marks. Breeding males develop more intense coloration, sometimes with reddish or orange bellies and darker fins.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Prominent white or cream-colored spots on the body, lacking red spots (unlike many other chars/trout)., Absence of teeth on the vomerine shaft (a key characteristic distinguishing Salvelinus from Salmo and Oncorhynchus)., Adipose fin present., Relatively large mouth extending beyond the posterior margin of the eye in adults., Forked caudal fin.

Dorsal fin

Single dorsal fin, typically with 10-14 rays.

Tail fin

Moderately forked caudal fin.

Pectoral fin

Paired pectoral fins, relatively small.

Distinctive fins

Pelvic fins are also paired. All fins are generally dark, sometimes with a lighter leading edge, especially in breeding males.

Identification Tips

1. 1

   Spotting Pattern

   Look for distinct white or cream-colored spots on a darker background. The absence of red spots is a key differentiator from many other trout and char species.

2. 2

   Mouth Size

   The mouth is relatively large, extending past the posterior margin of the eye in adults.

3. 3

   Vomerine Teeth

   A definitive identification requires examination of the vomerine bone in the roof of the mouth; Salvelinus species lack teeth on the shaft of the vomer, possessing them only on the head of the vomer.

4. 4

   Body Shape

   Elongated, streamlined body typical of salmonids adapted to flowing water.

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