How to Identify Common Minnow

To identify Common Minnow (Zacco platypus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Silvery-white to pale yellow on the flanks and belly, with a darker, olive-brown to greenish-grey back. A prominent dark lateral stripe extends from the operculum to the caudal fin base. During breeding season, males develop vibrant red and blue coloration on their fins and body, along with nuptial tubercles on the head.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Prominent dark lateral stripe, Forked caudal fin, Relatively large eyes, Males develop breeding coloration and tubercles

Dorsal fin

Single, short-based dorsal fin with 8-9 branched rays, positioned slightly posterior to the pelvic fins.

Tail fin

Deeply forked caudal fin with pointed lobes.

Pectoral fin

Paired pectoral fins are relatively long and pointed, typically with 15-17 rays.

Distinctive fins

Pelvic fins are abdominal, with 8 rays. Anal fin is relatively long, with 10-12 branched rays.

Identification Tips

1. 1

   Lateral Stripe

   Look for the distinct dark lateral stripe running along the side of the body, from the gill cover to the tail fin. This is a key identifier.

2. 2

   Body Shape

   Its elongated, streamlined body is characteristic of a fish adapted to flowing water.

3. 3

   Fin Coloration (Breeding Males)

   During the breeding season, males exhibit striking red and blue hues on their fins and body, along with small, pearl-like nuptial tubercles on their heads and snouts.

4. 4

   Mouth Position

   The terminal mouth is indicative of its feeding habits, often picking food from the water column or surface.

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