So bestimmen Sie Sterlet

Um Sterlet (Acipenser ruthenus) zu bestimmen, achten Sie auf diese Schlüsselmerkmale.

Körperliche Merkmale

Körperform

elongated

Färbung

Dorsal side is typically greyish-yellow to brownish-grey, often with a lighter, yellowish-white ventral side. The scutes are usually lighter in color, sometimes yellowish or whitish.

Schuppentyp

none

Maulstellung

inferior

Besondere Merkmale

Five rows of bony scutes (dorsal, lateral, and ventral). The dorsal scutes are numerous (11-17) and closely set., Long, pointed snout, often upturned., Four fringed barbels located closer to the tip of the snout than to the mouth., Lower lip is deeply cleft or interrupted in the middle., Smallest of the sturgeon species, rarely exceeding 1 meter in length.

Rückenflosse

Single dorsal fin, located far back on the body, with 32-49 rays.

Schwanzflosse

Heterocercal caudal fin (upper lobe longer than the lower lobe), typical of sturgeons.

Brustflosse

Paired pectoral fins, relatively large.

Auffällige Flossen

Anal fin with 16-30 rays, located posterior to the dorsal fin. All fins are relatively small compared to the body size.

Bestimmungstipps

1. 1

   Snout Shape

   The Sterlet has a distinctly long and pointed snout, often slightly upturned, which helps differentiate it from other sturgeon species that may have blunter or shorter snouts.

2. 2

   Barbels

   Observe the four barbels located on the underside of the snout. In Sterlets, these barbels are fringed (feather-like) and positioned closer to the tip of the snout than to the mouth. This is a key distinguishing feature.

3. 3

   Lower Lip

   The lower lip of the Sterlet is deeply cleft or interrupted in the middle, unlike many other sturgeon species where it is continuous.

4. 4

   Dorsal Scutes

   Count the dorsal scutes (bony plates along the back). Sterlets typically have 11-17 dorsal scutes, which are usually numerous and closely set, often touching each other.

5. 5

   Size

   Sterlets are generally smaller than most other sturgeon species, rarely exceeding 1 meter (3.3 feet) in length and 16 kg (35 lbs) in weight, making them the smallest true sturgeon.

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