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Carassius carassius, commonly known as the Crucian Carp, is a medium-sized freshwater fish belonging to the family Cyprinidae. It is characterized by its deep, laterally compressed body, typically golden-bronze coloration, and lack of barbels. This species is renowned for its exceptional hardiness and ability to survive in harsh environmental conditions, including hypoxic waters and freezing temperatures, by entering a state of torpor and producing ethanol as a metabolic byproduct.
Caratteristiche fisiche
- Forma del corpo
- compressed
- Colorazione
- Typically golden-bronze to dark brown on the back, fading to a lighter golden-yellow or brassy color on the flanks, and a pale, often yellowish-white belly. Fins are usually reddish-brown or dusky. Juveniles may have a dark spot at the base of the caudal fin, which fades with age.
- Tipo di squame
- cycloid
- Posizione della bocca
- terminal
- Caratteristiche distintive
- Deep, high-backed body, often with a convex dorsal profile., Absence of barbels around the mouth (a key differentiator from Common Carp)., Large, cycloid scales., Strongly serrated last unbranched ray in both dorsal and anal fins., Lateral line complete, with 31-36 scales.
- Pinna dorsale
- Long, with 3-4 unbranched rays and 14-20 branched rays. The last unbranched ray is strong and serrated.
- Pinna caudale
- Moderately forked, with rounded lobes.
- Pinna pettorale
- Relatively short, rounded.
- Pinne distintive
- Anal fin with 3 unbranched and 5-8 branched rays, also featuring a strong, serrated last unbranched ray.
Consigli per l'identificazione
Barbels
Crucian Carp lack barbels around the mouth, unlike Common Carp (Cyprinus carpio) which have two pairs.
Body Shape
Possesses a very deep, laterally compressed body, often appearing almost circular in profile, especially in well-fed individuals. This is more pronounced than in most other carp species.
Dorsal Fin Ray
The last unbranched ray of the dorsal fin is strong and distinctly serrated, a characteristic shared with Common Carp but useful for distinguishing from other cyprinids.
Caudal Spot (Juveniles)
Young Crucian Carp often exhibit a prominent dark spot at the base of the caudal fin, which typically fades as they mature.
Habitat
- Tipo di acqua
- freshwater
- Profondità
- Typically found in shallow waters, but can inhabit depths up to several meters.
- Ambiente
- Prefers still or slow-flowing waters such as ponds, lakes, oxbows, canals, and backwaters of rivers. Thrives in heavily vegetated areas with muddy or silty bottoms. Highly tolerant of low oxygen levels, high turbidity, and fluctuating water temperatures.
- Areale geografico
- Native to much of Northern and Eastern Europe, extending into Siberia. Introduced to various other parts of Europe and Asia, sometimes becoming invasive.
Informazioni sull'acquario
- Livello di cura: beginner
- Temperamento: peaceful
- Dieta: omnivore
- Dimensione minima della vasca: 75 gallons (for a single adult, larger for groups)
- Temperatura: 39-77°F (4-25°C)
- Livello di pH: 6.0-8.0
- Durezza: 5-20 dGH
- Compatibilità: Best kept in a species-only tank or with other large, peaceful, coldwater fish. Avoid aggressive or fin-nipping species.
- Requisiti speciali: Requires a well-filtered tank with ample swimming space and areas for hiding. Tolerant of a wide range of water conditions but thrives in stable environments. Can be kept in outdoor ponds in temperate climates.
Informazioni in natura
- Stato di conservazione: least concern
- Stagionalità: Spawns from late spring to early summer (May-July) when water temperatures reach 14-18°C. Activity levels are reduced in colder months, with fish often burying themselves in mud during winter.
- Prezzo di mercato: Low
- Importanza commerciale: low
- Sapore: Mild, somewhat earthy, can be bony.
- Consistenza: Flaky, soft.
- Metodi di cottura: Frying, Baking, Smoking, Stewing
- Valore nutrizionale: Good source of protein and omega-3 fatty acids, though not widely consumed in many Western cultures due to boniness and potential muddy taste from certain habitats.
Fatti chiave
Hypoxia Toleranceamazing
Crucian Carp are exceptionally tolerant of low oxygen conditions (hypoxia) and even anoxia (complete lack of oxygen). They can survive for extended periods in ice-covered ponds by switching to anaerobic metabolism, producing ethanol as a byproduct, which is then released through their gills.
Ethanol Productionbehavior
During periods of anoxia, Crucian Carp convert lactic acid (a typical anaerobic byproduct) into ethanol, which is less toxic and can be excreted. This unique metabolic adaptation allows them to survive conditions lethal to most other fish.
Body Shape Plasticitybehavior
The body shape of Crucian Carp can vary significantly depending on the presence of predators. In waters with predatory fish (e.g., pike), they develop a deeper, more robust body, making them harder for predators to swallow. In predator-free environments, they tend to be more slender.
Longevityinteresting
Crucian Carp can live for up to 10-15 years in the wild, with some individuals potentially living longer under optimal conditions.
Ecological Rolebehavior
As omnivores, Crucian Carp play a role in controlling invertebrate populations and consuming detritus. Their ability to thrive in harsh conditions makes them important colonizers of disturbed or marginal aquatic habitats.
Informazioni di sicurezza
Sicuro- Livello di sicurezza: safe
- Velenoso: No
- Commestibilità: edible
- Note sul maneggio: Crucian Carp are generally harmless to handle. Care should be taken to support their body adequately to avoid injury to the fish. Their fins, particularly the dorsal and anal fins, have strong, serrated rays that can cause minor scratches if not handled carefully. No specific precautions beyond standard fish handling are required.
Specie simili
Common Carp
Cyprinus carpio
Common Carp have two pairs of prominent barbels around their mouth, while Crucian Carp have none. Common Carp also tend to have a more elongated body shape and a less convex dorsal profile.
Goldfish
Carassius auratus
Goldfish (Carassius auratus) are closely related and can hybridize with Crucian Carp. Wild-type Goldfish often have a more slender body than Crucian Carp, and the last unbranched dorsal fin ray is typically less strongly serrated or smooth. The caudal spot in juveniles is also less common or absent in Goldfish. Goldfish also tend to have a more pointed snout.
Gibelian Carp
Carassius gibelio
The Gibelian Carp (also known as Prussian Carp or Silver Crucian Carp) is often confused with C. carassius. C. gibelio typically has a more slender body, a less convex dorsal profile, and a silvery-grey coloration rather than the golden-bronze of C. carassius. The last unbranched dorsal fin ray in C. gibelio is usually less strongly serrated than in C. carassius. Hybridization between these two species is common, making identification challenging in some areas.
Classificazione scientifica
- Regno
- Animalia
- Phylum
- Chordata
- Classe
- Actinopterygii
- Ordine
- Cypriniformes
- Famiglia
- Cyprinidae
- Genere
- Carassius
- Specie
- Carassius carassius
Esplora Crucian Carp
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