How to Identify Argentine Silverside

To identify Argentine Silverside (Odontesthes bonariensis), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Silvery flanks, often with a distinct lateral band running from the operculum to the caudal fin. The dorsal surface is typically darker, ranging from greenish-gray to bluish-gray, fading to white on the ventral side. Fins are generally translucent or slightly dusky.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Elongated, fusiform body, Two distinct dorsal fins, the first spiny and the second soft-rayed, A prominent silvery lateral stripe, Protrusible mouth with small, conical teeth

Dorsal fin

Two dorsal fins: the first with 4-9 spines, the second with 1 spine and 9-13 soft rays. The first dorsal fin is typically shorter than the second.

Tail fin

Forked caudal fin.

Pectoral fin

Moderately sized, positioned laterally.

Distinctive fins

Pelvic fins are abdominal, located well behind the pectoral fins. Anal fin has 1 spine and 15-20 soft rays.

Identification Tips

1. 1

   Body Shape

   Look for the characteristic elongated, slender body typical of silversides.

2. 2

   Coloration and Lateral Band

   Observe the silvery flanks and the distinct, often iridescent, lateral stripe running along the side of the body.

3. 3

   Dorsal Fins

   Note the presence of two separate dorsal fins, with the first being spiny and generally shorter than the soft-rayed second dorsal fin.

4. 4

   Mouth

   Examine the terminal, slightly upward-pointing mouth, adapted for surface feeding.

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