How to Identify Dark chub

To identify Dark chub (Nipponocypris temminckii), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dorsal side dark olive to brownish-gray, fading to silvery-white on the ventral side. A prominent dark lateral stripe often runs from the operculum to the caudal peduncle. Fins are typically dusky or translucent. Breeding males may exhibit reddish tints on fins and body.

Scale type

cycloid

Mouth position

subterminal

Distinctive features

Elongated, fusiform body, Small, subterminal mouth, Prominent dark lateral stripe, Absence of barbels

Dorsal fin

Short, with 3 unbranched and 7-8 branched rays, originating slightly anterior to the pelvic fin origin.

Tail fin

Deeply forked, with pointed lobes.

Pectoral fin

Relatively short, rounded, with 15-17 rays.

Distinctive fins

Pelvic fins are abdominal, with 1 unbranched and 8 branched rays. Anal fin has 3 unbranched and 5-6 branched rays.

Identification Tips

1. 1

   Lateral Stripe

   Look for the distinct dark lateral stripe running along the side of the body, which is a key identifier for this species.

2. 2

   Mouth Position

   Observe the small, subterminal mouth, which is characteristic of its feeding habits.

3. 3

   Absence of Barbels

   Note the lack of barbels around the mouth, distinguishing it from some other cyprinids.

4. 4

   Fin Ray Counts

   For precise identification, count the fin rays, especially in the dorsal (3 unbranched, 7-8 branched) and anal (3 unbranched, 5-6 branched) fins.

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