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Anguilla anguilla, commonly known as the European Eel, is a critically endangered species of catadromous fish. It is characterized by its snake-like, elongated body, small pectoral fins, and continuous dorsal, caudal, and anal fins. The life cycle of the European Eel is complex, involving extensive migrations between freshwater habitats in Europe and North Africa and its spawning grounds in the Sargasso Sea. They undergo several distinct developmental stages: leptocephalus larvae, glass eels, elvers, yellow eels, and finally silver eels, each with unique morphological and physiological adaptations.
Características físicas
- Formato do corpo
- eel-like
- Coloração
- Varies with life stage. Leptocephali are transparent. Glass eels are transparent. Elvers are dark brown to black. Yellow eels have a yellowish-brown to olive-green dorsal side and a yellowish belly. Silver eels develop a silvery-white belly and dark back, with enlarged eyes and pectoral fins.
- Tipo de escama
- cycloid
- Posição da boca
- terminal
- Características distintivas
- Elongated, snake-like body, Small, pointed head, Small, gill openings located ventrally, Continuous dorsal, caudal, and anal fins forming a single fringe around the posterior body, Small, embedded scales (often not visible to the naked eye), Prominent lower jaw
- Nadadeira dorsal
- Long, continuous, originating far behind the pectoral fins and merging with the caudal and anal fins.
- Nadadeira caudal
- Rounded, confluent with dorsal and anal fins.
- Nadadeira peitoral
- Small, fan-like, located just behind the head.
- Nadadeiras características
- Absence of pelvic fins.
Dicas de identificação
Body Shape
The most striking feature is its elongated, serpentine body, which is almost cylindrical anteriorly and slightly compressed posteriorly.
Fin Structure
The continuous dorsal, caudal, and anal fins, forming a single fringe along the back and underside of the posterior body, are characteristic. The absence of pelvic fins is also a key identifier.
Coloration
Observe the color, which changes with age and life stage. Yellow eels have a distinct yellowish belly, while silver eels are silvery-white ventrally.
Gill Openings
Small, slit-like gill openings are located ventrally, just anterior to the pectoral fins.
Habitat
- Tipo de água
- brackish
- Profundidade
- Varies from shallow coastal waters and rivers to deep oceanic spawning grounds (Sargasso Sea, 400-700m).
- Ambiente
- Highly adaptable, inhabiting a wide range of aquatic environments including rivers, lakes, estuaries, coastal lagoons, and the open ocean. Prefers muddy or sandy bottoms for burrowing and areas with dense vegetation or submerged structures for cover.
- Distribuição geográfica
- Native to the Atlantic Ocean and its adjacent seas, including the Baltic Sea, Mediterranean Sea, and Black Sea. Its freshwater distribution spans across Europe and North Africa, from Scandinavia to Morocco and from Iceland to Russia.
Informações sobre aquário
- Nível de cuidado: advanced
- Temperamento: semi-aggressive
- Alimentação: carnivore
- Tamanho mínimo do aquário: 200 gallons (for adult specimens)
- Temperatura: 18-25°C (64-77°F)
- Nível de pH: 6.5-8.0
- Dureza da água: 5-20 dGH
- Compatibilidade: Generally not suitable for community tanks due to their predatory nature and potential to consume smaller fish. Best kept in species-specific tanks or with very large, robust tank mates.
- Requisitos especiais: Requires a securely covered tank as they are expert escape artists. A substrate of fine sand or gravel is preferred for burrowing. Excellent filtration is essential due to their messy eating habits. Provide ample hiding spots such as PVC pipes, caves, and dense vegetation. Dim lighting is preferred as they are primarily nocturnal.
Informações no ambiente natural
- Estado de conservação: critically endangered
- Sazonalidade: Migration patterns are seasonal; glass eels enter European rivers from winter to spring, while silver eels migrate to the Sargasso Sea in autumn and winter.
- Preço de mercado: Highly variable, often very high due to scarcity and demand, especially in East Asian markets.
- Importância comercial: high
- Sabor: Rich, oily, and distinctive flavor, often described as earthy or savory.
- Textura: Firm, flaky, and somewhat fatty.
- Métodos de preparo: Smoked, Grilled, Fried, Stewed, Jellied
- Valor nutricional: High in protein, omega-3 fatty acids, and vitamins A, D, and E.
Fatos principais
Incredible Migrationamazing
European Eels undertake one of the most extraordinary migrations in the animal kingdom, traveling thousands of kilometers from European rivers to the Sargasso Sea to spawn, and their larvae then drift back to Europe.
Long Lifespanrecord
While in freshwater, European Eels can live for many decades, with some individuals recorded living over 80 years in captivity.
Sex Determinationinteresting
The sex of European Eels is not genetically determined but is influenced by environmental factors such as population density, food availability, and temperature during their freshwater growth phase.
Critically Endangered Statusinteresting
The European Eel population has declined by over 90% in recent decades, primarily due to habitat loss, barriers to migration, overfishing, pollution, and the impact of parasites like Anguillicola crassus.
Nocturnal Huntersbehavior
European Eels are primarily nocturnal predators, emerging from their hiding spots at night to hunt for invertebrates, small fish, and carrion.
Informações de segurança
Manusear com cuidado- Nível de segurança: caution
- Venenoso: Não
- Comestibilidade: edible
- Observações de manuseio: Eel blood contains a neurotoxin (ichthyotoxin) that is toxic if ingested or if it enters the bloodstream through an open wound. This toxin is denatured by heat, making cooked eel safe to eat. Handle live eels with care to avoid bites and contact with blood. Their skin is very slippery, making them difficult to hold. Use gloves and appropriate tools if handling.
Espécies similares
American Eel
Anguilla rostrata
The European Eel typically has 110-119 vertebrae, while the American Eel has 103-110 vertebrae. This is the primary morphological distinction, often requiring scientific examination. Their geographic distributions are also distinct, though their spawning grounds in the Sargasso Sea overlap.
Conger Eel
Conger conger
Conger eels are generally larger, lack scales, have a more pointed snout, and their dorsal fin starts much closer to the pectoral fins. Their upper jaw is typically longer than the lower jaw, unlike the European Eel. Conger eels are exclusively marine.
Lamprey
Petromyzon marinus (Sea Lamprey)
Lampreys are jawless fish (agnathans) with a distinctive circular, sucker-like mouth containing numerous horny teeth. They lack paired fins and have multiple separate gill openings, unlike the single gill slit of true eels. Their skin is smooth and scaleless.
Classificação científica
- Reino
- Animalia
- Filo
- Chordata
- Classe
- Actinopterygii
- Ordem
- Anguilliformes
- Família
- Anguillidae
- Gênero
- Anguilla
- Espécie
- Anguilla anguilla
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