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The Sterlet (Acipenser ruthenus) is a relatively small species of sturgeon, characterized by its elongated body, prominent scutes, and distinctive fringed barbels. It is a freshwater fish, primarily inhabiting large rivers and lakes in Eastern Europe and Siberia. Unlike many other sturgeon species, the Sterlet is entirely freshwater-resident and does not undertake anadromous migrations to the sea. It is known for its delicate flesh and valuable roe, though its conservation status is a significant concern due to overfishing and habitat degradation.
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
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.
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.
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.
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.
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.
Lebensraum
- Wassertyp
- freshwater
- Tiefe
- Typically found in deeper channels of large rivers, but also moves into shallower areas for feeding and spawning. Prefers depths with moderate to strong currents.
- Umgebung
- Large, clear, well-oxygenated rivers and associated lakes. Prefers sandy or gravelly bottoms where it can forage for benthic invertebrates. Avoids stagnant or heavily vegetated areas.
- Geografische Verbreitung
- Native to rivers flowing into the Black, Azov, and Caspian Seas, as well as rivers in Siberia (Ob, Yenisei, Lena). Its range includes parts of Russia, Ukraine, Kazakhstan, Romania, Bulgaria, Serbia, Hungary, and Austria (historically). Introduced populations exist in some other European countries.
Aquarieninformationen
- Pflegeaufwand: advanced
- Temperament: peaceful
- Ernährung: carnivore
- Mindestbeckengröße: 2000 gallons (for adult specimens, though not typically recommended for home aquaria due to size)
- Temperatur: 10-20°C (50-68°F)
- pH-Wert: 7.0-8.0
- Härte: 10-25 dGH
- Verträglichkeit: Best kept in species-specific tanks or with other large, peaceful, cold-water fish that can tolerate similar water parameters and do not compete for benthic food sources. Avoid small fish that could be prey.
- Besondere Anforderungen: Requires extremely large, well-filtered tanks with excellent oxygenation and strong water flow. Substrate should be fine sand or smooth gravel to protect their sensitive barbels. They are highly sensitive to poor water quality and require a diet rich in protein, typically sinking pellets formulated for sturgeon, supplemented with live or frozen foods like bloodworms, earthworms, and shrimp. Not suitable for typical home aquaria due to their size and specific needs.
Informationen zum Wildbestand
- Erhaltungszustand: vulnerable
- Saisonalität: Spawns in spring (April-May) when water temperatures reach 10-15°C. Feeding activity is higher in warmer months and reduced in winter.
- Marktpreis: Historically very high, especially for its roe (caviar). Current market price varies significantly due to conservation status and legality of wild catch.
- Kommerzielle Bedeutung: high
- Geschmack: Mild, delicate, and slightly oily.
- Textur: Firm, flaky, and tender.
- Zubereitungsarten: Grilling, Baking, Smoking, Steaming
- Nährwert: Rich in Omega-3 fatty acids, protein, and various vitamins and minerals.
Wichtige Fakten
Freshwater Exclusivebehavior
Unlike most other sturgeon species, the Sterlet is entirely freshwater-resident and does not migrate to saltwater.
Smallest Sturgeoninteresting
The Sterlet is generally considered the smallest true sturgeon species, rarely exceeding 1 meter in length.
Fringed Barbelsinteresting
Its distinctive fringed (feather-like) barbels are a key identification feature, setting it apart from other sturgeon species.
Caviar Sourceinteresting
Historically, Sterlet roe was highly prized for caviar, contributing to its significant commercial value and subsequent overexploitation.
Ancient Lineageevolution
Sturgeons, including the Sterlet, are often referred to as 'living fossils' due to their ancient lineage, with their morphology remaining largely unchanged for millions of years.
Sicherheitsinformationen
Sicher- Sicherheitsstufe: safe
- Giftig: Nein
- Essbarkeit: edible
- Hinweise zum Umgang: Sterlets are not venomous or dangerous to handle. However, like all fish, they should be handled with care to minimize stress and injury to the fish. Use wet hands or a wet net to avoid removing their protective slime coat. Their scutes can be sharp, so caution is advised to prevent scratches. Always return wild specimens to the water quickly and gently.
Ähnliche Arten
Siberian Sturgeon
Acipenser baerii
Siberian sturgeon typically have a blunter snout, unfringed barbels, and a continuous lower lip. They also grow significantly larger than Sterlets.
Russian Sturgeon
Acipenser gueldenstaedtii
Russian sturgeon have a shorter, blunter snout, unfringed barbels, and a continuous lower lip. Their dorsal scutes are typically less numerous and more widely spaced than those of the Sterlet. They also attain a much larger size.
Stellate Sturgeon (Sevruga)
Acipenser stellatus
While the Stellate Sturgeon also has a long, pointed snout, its barbels are unfringed and positioned closer to the mouth than to the snout tip. Its body is also more slender and elongated, and its scutes are star-shaped.
Wissenschaftliche Klassifikation
- Reich
- Animalia
- Stamm
- Chordata
- Klasse
- Actinopterygii
- Ordnung
- Acipenseriformes
- Familie
- Acipenseridae
- Gattung
- Acipenser
- Art
- Acipenser ruthenus
Sterlet entdecken
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