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Squalius alburnoides, commonly known as Bordalo, is a small to medium-sized cyprinid fish endemic to the Iberian Peninsula. It is notable for its complex evolutionary history, being a hybridogenetic species complex, meaning it reproduces clonally or hemiclonally, often requiring the sperm of a parental species (usually Squalius pyrenaicus or Squalius carolitertii) to activate egg development, but without incorporating the paternal genome in the offspring. This results in populations composed of diploid and polyploid individuals with varying genomic compositions. Morphologically, it resembles a small chub or dace, adapted to flowing freshwater environments.
Características físicas
- Formato do corpo
- elongated
- Coloração
- Dorsal side is typically dark grey to greenish-brown, fading to silvery flanks and a whitish belly. A faint, often indistinct, lateral stripe may be present. Fins are generally translucent or slightly yellowish, sometimes with a reddish tinge at the base during breeding season.
- Tipo de escama
- cycloid
- Posição da boca
- terminal
- Características distintivas
- Slender, elongated body, Relatively small, terminal mouth, Large scales, Absence of barbels
- Nadadeira dorsal
- Short, with 7-9 branched rays, positioned slightly behind the pelvic fins.
- Nadadeira caudal
- Deeply forked caudal fin.
- Nadadeira peitoral
- Moderately sized, typically with 15-17 rays.
- Nadadeiras características
- All fins are relatively small in proportion to the body.
Dicas de identificação
Body Shape
Slender and elongated, similar to a dace or small chub, but generally more streamlined.
Mouth
Small, terminal mouth without barbels, distinguishing it from many other cyprinids like barbel species.
Scales
Relatively large scales for its body size, with a distinct lateral line that is usually complete.
Coloration
Silvery flanks with a darker back, lacking prominent spots or patterns, though a faint lateral stripe might be visible.
Fin Position
Dorsal fin origin is typically posterior to the pelvic fin origin.
Habitat
- Tipo de água
- freshwater
- Profundidade
- Typically found in shallow to moderately deep sections of rivers and streams, usually less than 2 meters.
- Ambiente
- Prefers clear, well-oxygenated rivers and streams with moderate to fast currents. Often found over gravelly or stony bottoms, sometimes in areas with submerged vegetation. It avoids stagnant or heavily polluted waters.
- Distribuição geográfica
- Endemic to the Iberian Peninsula, primarily found in the Guadiana, Tagus, Douro, and Ebro river basins in Spain and Portugal. Its distribution is fragmented due to habitat degradation.
Informações sobre aquário
- Nível de cuidado: advanced
- Temperamento: peaceful
- Alimentação: omnivore
- Tamanho mínimo do aquário: 200 liters (approximately 50 gallons) for a small group
- Temperatura: 15-22°C (59-72°F)
- Nível de pH: 6.5-7.5
- Dureza da água: 5-15 dGH
- Compatibilidade: Best kept in species-specific tanks or with other peaceful, cool-water native European cyprinids of similar size. Avoid aggressive or fin-nipping species.
- Requisitos especiais: Requires well-oxygenated water with moderate flow, mimicking its natural riverine habitat. A substrate of sand and fine gravel with smooth rocks and driftwood is ideal. Live plants are beneficial for cover and water quality. Sensitive to poor water quality and high temperatures. Not typically available in the aquarium trade due to its conservation status and specific habitat requirements.
Informações no ambiente natural
- Estado de conservação: near threatened
- Sazonalidade: Spawning typically occurs from late spring to early summer (April to June), depending on water temperature and flow conditions. Activity levels are generally higher during warmer months.
- Preço de mercado: N/A
- Importância comercial: none
- Sabor: Not typically consumed due to its small size and conservation status.
- Textura: N/A
- Valor nutricional: N/A
Fatos principais
Hybridogenetic Reproductionevolution
Squalius alburnoides is a fascinating example of a hybridogenetic species complex. This means it reproduces clonally or hemiclonally, often 'stealing' sperm from a related species (like Squalius pyrenaicus) to activate egg development, but without incorporating the paternal genome into the offspring. This results in populations with diverse ploidy levels (diploid, triploid, tetraploid).
Evolutionary Puzzleevolution
Its complex reproductive strategy and genomic diversity make it a significant model organism for studying hybridogenesis, polyploidy, and the evolution of reproductive modes in vertebrates.
Endemic to Iberiainteresting
This species is found exclusively in the rivers of the Iberian Peninsula, making it a unique component of the region's freshwater biodiversity.
Ecological Rolebehavior
As a small omnivore, it plays a role in the food web by consuming invertebrates and plant matter, and in turn, serves as prey for larger predatory fish and birds.
Conservation Concerninteresting
Due to habitat degradation, water pollution, and the introduction of invasive species, Squalius alburnoides is classified as Near Threatened by the IUCN, highlighting the need for conservation efforts.
Informações de segurança
Seguro- Nível de segurança: safe
- Venenoso: Não
- Comestibilidade: not recommended
- Observações de manuseio: No specific handling precautions are required beyond general care for live fish. Handle gently to avoid injury to the fish. Not venomous and poses no threat to humans.
Espécies similares
Iberian Chub
Squalius pyrenaicus
S. pyrenaicus generally has a more robust body, a larger head, and a slightly subterminal mouth. It also typically reaches a larger size. The Bordalo's body is more slender and fusiform.
Northern Chub
Squalius carolitertii
Similar to S. pyrenaicus, S. carolitertii is generally more robust and has a larger head. Distinguishing S. alburnoides from its parental species often requires genetic analysis due to their close morphological resemblance and hybridogenetic nature.
Bleak
Alburnus alburnus
Bleak (Alburnus alburnus) has a more compressed body, a distinctly superior mouth, and typically a more pronounced silvery lateral stripe. Its dorsal fin is also usually positioned further forward.
Classificação científica
- Reino
- Animalia
- Filo
- Chordata
- Classe
- Actinopterygii
- Ordem
- Cypriniformes
- Família
- Cyprinidae
- Gênero
- Squalius
- Espécie
- Squalius alburnoides
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