How to Identify Zerla

To identify Zerla (Rutilus aula), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Silvery flanks, darker greenish-brown back. Fins are typically reddish, especially the pectoral, pelvic, and anal fins, becoming more intense during spawning. The iris of the eye is often reddish-orange.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Reddish fins, particularly pronounced in breeding males., Relatively large scales., Terminal mouth., Often has a dark spot at the base of the pectoral fin.

Dorsal fin

Single, relatively short dorsal fin with 3 unbranched and 8-9 branched rays.

Tail fin

Forked caudal fin.

Pectoral fin

Paired pectoral fins, typically reddish.

Distinctive fins

All fins, especially paired and anal fins, exhibit a reddish hue, which intensifies during the breeding season.

Identification Tips

1. 1

   Fin Coloration

   Look for the characteristic reddish tint on the pectoral, pelvic, and anal fins, which is a key identifier, especially in mature individuals.

2. 2

   Eye Color

   The reddish-orange iris of the eye can be a helpful distinguishing feature.

3. 3

   Body Shape and Size

   Its elongated, somewhat compressed body and typical size (up to 25-30 cm, though usually smaller) help differentiate it from other cyprinids.

4. 4

   Geographic Location

   Its restricted native range to Italy and parts of the Balkans is a strong indicator for identification.

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