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Achondrostoma oligolepis, commonly known as Ruivaca or Boga-portuguesa, is a small freshwater fish belonging to the family Cyprinidae. It is endemic to the Iberian Peninsula, specifically found in Portugal. This species is characterized by its relatively small scales and a streamlined body adapted for life in flowing waters. It plays an important ecological role as both a prey species and a consumer of small invertebrates and algae.
Características físicas
- Formato do corpo
- elongated
- Coloração
- The dorsal side is typically dark olive to brownish, fading to silvery flanks and a whitish belly. Fins are generally translucent, sometimes with a yellowish or reddish tint, especially during breeding season in males. A faint lateral line may be visible.
- Tipo de escama
- cycloid
- Posição da boca
- subterminal
- Características distintivas
- Relatively large, sparse scales (oligolepis means 'few scales'), Small, subterminal mouth, Streamlined body, Absence of barbels
- Nadadeira dorsal
- Single, short dorsal fin with 8-9 branched rays, positioned slightly anterior to the anal fin origin.
- Nadadeira caudal
- Forked caudal fin, moderately emarginate.
- Nadadeira peitoral
- Paired pectoral fins, relatively small.
- Nadadeiras características
- Pelvic fins are abdominal, positioned well behind the pectoral fins. All fins are soft-rayed.
Dicas de identificação
Scale Count
Count the number of scales along the lateral line. Achondrostoma oligolepis typically has 34-39 scales on the lateral line, which is fewer than many other Iberian cyprinids, hence its specific name 'oligolepis' (few scales).
Mouth Position
Observe the mouth. It is small and subterminal, meaning it is located slightly below the tip of the snout, adapted for grazing on benthic organisms.
Barbels
Check for barbels around the mouth. Achondrostoma oligolepis lacks barbels, which distinguishes it from some other cyprinid species.
Body Shape
Note the streamlined, fusiform body shape, indicative of a species adapted to flowing water.
Habitat
- Tipo de água
- freshwater
- Profundidade
- Typically found in shallow to moderately deep sections of rivers and streams, usually less than 2 meters.
- Ambiente
- Inhabits clear, well-oxygenated rivers and streams with moderate to strong currents. Prefers areas with gravel or rocky substrates, often associated with submerged vegetation or riparian cover. It is a rheophilic species, meaning it thrives in flowing water.
- Distribuição geográfica
- Endemic to the western Iberian Peninsula, specifically found in the Tagus, Sado, and Mira river basins in Portugal.
Informações sobre aquário
- Nível de cuidado: advanced
- Temperamento: peaceful
- Alimentação: omnivore
- Tamanho mínimo do aquário: 100 liters
- Temperatura: 18-22 °C
- Nível de pH: 6.5-7.5
- Dureza da água: 5-15 dGH
- Compatibilidade: Best kept in species-specific tanks or with other small, peaceful, cold-water fish that tolerate similar water parameters and flow. Avoid aggressive or much larger tank mates.
- Requisitos especiais: Requires well-oxygenated water with moderate to strong current, mimicking its natural riverine habitat. A substrate of fine gravel or sand with smooth rocks and driftwood is ideal. Live plants can be included but should be robust enough to withstand current. Excellent filtration is crucial.
Informações no ambiente natural
- Estado de conservação: vulnerable
- Sazonalidade: Spawning typically occurs from late spring to early summer (April to June), influenced by water temperature and flow. Activity levels are generally higher during warmer months.
- Preço de mercado: N/A
- Importância comercial: none
- Sabor: N/A
- Textura: N/A
- Valor nutricional: N/A
Fatos principais
Endemic to Portugalinteresting
Achondrostoma oligolepis is a species found exclusively in the river systems of Portugal, making it a unique part of the country's freshwater biodiversity.
Rheophilic Naturebehavior
This fish is highly adapted to living in flowing water, preferring clear, oxygen-rich streams and rivers with gravelly or rocky bottoms.
Conservation Concerninteresting
Listed as 'Vulnerable' by the IUCN, its populations are threatened by habitat degradation, water pollution, and the introduction of invasive species.
Dietary Habitsbehavior
The Ruivaca is an omnivore, primarily feeding on benthic invertebrates, algae, and detritus, playing a role in nutrient cycling within its ecosystem.
Taxonomic Revisionevolution
Previously classified under the genus Chondrostoma, genetic studies led to its reclassification into the genus Achondrostoma, highlighting its distinct evolutionary lineage.
Informações de segurança
Seguro- Nível de segurança: safe
- Venenoso: Não
- Comestibilidade: not recommended
- Observações de manuseio: Achondrostoma oligolepis is a small, harmless fish. When handling for scientific study or relocation, minimize stress by using wet hands or a soft net. Return to water quickly to prevent desiccation and oxygen deprivation.
Espécies similares
Boga-de-boca-arqueada
Achondrostoma arcasii
A. arcasii generally has a more arched mouth and a higher number of lateral line scales (typically 40-48) compared to A. oligolepis (34-39 scales). A. arcasii also tends to have a more robust body.
Boga-do-Guadiana
Achondrostoma occidentale
A. occidentale is geographically restricted to the Guadiana basin and typically has a higher number of lateral line scales (40-46) and a more pronounced dark lateral stripe than A. oligolepis.
Boga-de-Lisboa
Achondrostoma salmantinum
A. salmantinum, found in the Douro basin, has a higher number of lateral line scales (40-46) and often a more slender body profile than A. oligolepis.
Classificação científica
- Reino
- Animalia
- Filo
- Chordata
- Classe
- Actinopterygii
- Ordem
- Cypriniformes
- Família
- Cyprinidae
- Gênero
- Achondrostoma
- Espécie
- Achondrostoma oligolepis
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