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Astyanax lacustris, commonly known as Lambari, is a small, schooling freshwater fish belonging to the family Characidae. It is characterized by its silvery body, often with a distinct dark humeral spot and a caudal peduncle spot. This species is highly adaptable and widely distributed across various aquatic environments in South America, playing a significant ecological role as both a prey item and a consumer of small invertebrates and plant matter. Its resilience and reproductive capacity make it a common and important component of Neotropical freshwater ecosystems.
Características físicas
- Formato do corpo
- compressed
- Coloração
- Silvery body, often with a yellowish or greenish tint dorsally. A prominent, vertically elongated dark humeral spot is typically present behind the operculum. A less distinct, sometimes diffuse, dark spot may be present on the caudal peduncle. Fins are hyaline (clear) to yellowish, sometimes with reddish hues, especially in breeding males.
- Tipo de escama
- cycloid
- Posição da boca
- terminal
- Características distintivas
- Laterally compressed body, Adipose fin present, Complete lateral line, Two rows of premaxillary teeth, Typically 36-40 lateral line scales, Prominent dark humeral spot
- Nadadeira dorsal
- Typically 10-11 rays (ii-iii unbranched, 8-9 branched)
- Nadadeira caudal
- Forked, with symmetrical lobes
- Nadadeira peitoral
- Typically 11-13 rays
- Nadadeiras características
- Adipose fin present between the dorsal and caudal fins, characteristic of Characidae.
Dicas de identificação
Humeral Spot
Look for a distinct, vertically elongated dark spot located just behind the gill cover (operculum). This is a key diagnostic feature for Astyanax lacustris, though its intensity can vary.
Caudal Peduncle Spot
Observe the base of the caudal fin for a dark spot, which can range from well-defined to diffuse. This spot, combined with the humeral spot, helps differentiate it from other Astyanax species.
Body Shape and Coloration
Note the silvery, laterally compressed body. The overall body shape is fusiform, typical of active swimmers. Fin coloration can be hyaline to yellowish, sometimes with reddish tints, especially during breeding.
Lateral Line
The lateral line is complete, extending from the operculum to the caudal fin base. Counting the scales along the lateral line (typically 36-40) can aid in identification.
Habitat
- Tipo de água
- freshwater
- Profundidade
- Typically found in shallow to moderate depths, often near the surface or in mid-water columns.
- Ambiente
- Inhabits a wide range of freshwater environments including rivers, streams, lakes, lagoons, and reservoirs. Prefers areas with submerged vegetation, riparian cover, and moderate currents. Tolerant of varying water conditions.
- Distribuição geográfica
- Widespread across South America, particularly in the La Plata, Paraná, Uruguay, and São Francisco River basins, as well as coastal drainages in southeastern Brazil. Its distribution is extensive, reflecting its adaptability.
Informações sobre aquário
- Nível de cuidado: beginner
- Temperamento: peaceful
- Alimentação: omnivore
- Tamanho mínimo do aquário: 75 liters (20 gallons) for a small school
- Temperatura: 22-28°C (72-82°F)
- Nível de pH: 6.0-7.5
- Dureza da água: 5-15 dGH
- Compatibilidade: Excellent for community tanks with other peaceful, similarly sized fish. Avoid housing with aggressive or very large species that might prey on them.
- Requisitos especiais: Requires a well-planted tank with open swimming areas. Prefers to be kept in schools of 6 or more individuals to reduce stress and encourage natural behavior. Good filtration and regular water changes are essential.
Informações no ambiente natural
- Estado de conservação: least concern
- Sazonalidade: Breeds primarily during the rainy season (spring and summer) in its native range, when water levels are higher and food is abundant. Can be found year-round.
- Preço de mercado: Low, primarily for bait or local consumption
- Importância comercial: low
- Sabor: Mild, slightly sweet
- Textura: Delicate, flaky
- Métodos de preparo: Fried, Grilled, Stewed
- Valor nutricional: Good source of protein and omega-3 fatty acids, though typically consumed in smaller quantities due to size.
Fatos principais
Taxonomic Revisionevolution
Astyanax lacustris was formerly considered part of the Astyanax fasciatus species complex. Recent taxonomic revisions, based on morphological and molecular data, have recognized A. lacustris as a distinct species, highlighting the high biodiversity and ongoing research in Neotropical ichthyology.
Ecological Importanceinteresting
Lambaris are crucial components of freshwater food webs. They serve as a primary food source for larger predatory fish, birds, and reptiles, while also helping to control insect populations and contributing to nutrient cycling through their omnivorous diet.
Bioindicator Speciesinteresting
Due to their wide distribution and sensitivity to environmental changes, Astyanax species, including A. lacustris, are often used as bioindicator species in studies assessing water quality and ecosystem health in South American rivers.
Reproductive Strategybehavior
Astyanax lacustris exhibits a high reproductive capacity, with females capable of laying thousands of eggs. This r-selected strategy allows them to quickly colonize new habitats and recover from population disturbances, contributing to their widespread success.
Informações de segurança
Seguro- Nível de segurança: safe
- Venenoso: Não
- Comestibilidade: edible
- Observações de manuseio: No specific handling precautions are required beyond standard fish handling practices to minimize stress to the fish. They do not possess venomous spines or any known toxic properties. Handle gently to avoid scale damage.
Espécies similares
Lambari
Astyanax altiparanae
A. altiparanae often has a more rounded humeral spot and typically fewer lateral line scales (34-38). Morphometric and meristic differences, particularly in fin ray counts and body proportions, are used for definitive differentiation by ichthyologists. Genetic analysis is often required for precise distinction due to high morphological plasticity within the genus.
Lambari
Astyanax fasciatus
A. fasciatus (now often considered a species complex) generally has a more pronounced, often horizontally elongated humeral spot and can exhibit a more robust body. The caudal peduncle spot might be more intense. Taxonomic revisions have led to many populations previously identified as A. fasciatus being reclassified, including A. lacustris.
Lambari
Astyanax bimaculatus
A. bimaculatus typically has two distinct dark spots: one humeral and one on the caudal peduncle, which are often more prominent and well-defined than in A. lacustris. The body shape can also be slightly deeper.
Classificação científica
- Reino
- Animalia
- Filo
- Chordata
- Classe
- Actinopterygii
- Ordem
- Characiformes
- Família
- Characidae
- Gênero
- Astyanax
- Espécie
- Astyanax lacustris
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