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Poecilia vivipara, commonly known as Barrigudinho, is a small, viviparous freshwater fish belonging to the family Poeciliidae. It is characterized by its robust body, sexual dimorphism, and adaptability to various aquatic environments. Males are typically smaller and more colorful with a modified anal fin (gonopodium) for internal fertilization, while females are larger and plainer. This species is known for its live-bearing reproduction, giving birth to fully formed, free-swimming fry.
Características físicas
- Formato do corpo
- elongated
- Coloração
- Males are typically more colorful, exhibiting iridescent scales, often with blue, green, or yellow hues, and sometimes dark spots or patterns on the body and fins. Females are generally duller, ranging from olive-green to silvery-grey, with a prominent gravid spot near the anal fin when pregnant. Both sexes can display a dark lateral stripe or series of spots.
- Tipo de escama
- cycloid
- Posição da boca
- superior
- Características distintivas
- Sexual dimorphism: males are smaller and more colorful with a gonopodium; females are larger and plainer., Live-bearing reproduction., Robust body shape.
- Nadadeira dorsal
- Single dorsal fin, typically with 7-9 rays. In males, it can be slightly elongated or pointed.
- Nadadeira caudal
- Rounded to slightly truncate caudal fin.
- Nadadeira peitoral
- Small, clear pectoral fins.
- Nadadeiras características
- Anal fin of males is modified into a gonopodium, a rod-like structure used for internal fertilization. Females have a fan-shaped anal fin.
Dicas de identificação
Size and Shape
Males reach up to 3-4 cm (1.2-1.6 inches) total length, while females can grow up to 5-6 cm (2-2.4 inches). Body is moderately robust and somewhat compressed laterally.
Coloration
Look for the iridescent colors and patterns on males, and the plainer, often olive-grey, coloration of females. The gravid spot on pregnant females is a key indicator.
Fin Morphology
The most definitive feature is the male's gonopodium (modified anal fin) for internal fertilization, which is absent in females.
Behavior
Observe their schooling behavior and active swimming in vegetated areas. Males will often display to females.
Habitat
- Tipo de água
- freshwater
- Profundidade
- Typically found in shallow waters, often less than 1 meter.
- Ambiente
- Inhabits a wide range of freshwater and brackish environments, including slow-moving rivers, streams, canals, ditches, ponds, lakes, and coastal lagoons. Prefers areas with dense aquatic vegetation for cover and food sources. Can tolerate varying levels of salinity and oxygen.
- Distribuição geográfica
- Native to South America, specifically along the Atlantic coast from Venezuela to Argentina, including Brazil, Uruguay, and Paraguay. Also found in some Caribbean islands.
Informações sobre aquário
- Nível de cuidado: beginner
- Temperamento: peaceful
- Alimentação: omnivore
- Tamanho mínimo do aquário: 30 liters (8 gallons)
- Temperatura: 20-28°C (68-82°F)
- Nível de pH: 7.0-8.0
- Dureza da água: 10-25 dGH
- Compatibilidade: Compatible with other peaceful, small to medium-sized fish. Avoid fin-nippers or overly aggressive species. Best kept in groups of its own kind, with a higher ratio of females to males to reduce male harassment.
- Requisitos especiais: Requires a well-planted tank with hiding spots. Can tolerate a range of water conditions but thrives in stable, clean water. A good lid is recommended as they can jump. Brackish water conditions can also be tolerated, and sometimes preferred, depending on the wild origin of the stock.
Informações no ambiente natural
- Estado de conservação: least concern
- Sazonalidade: Reproduction occurs year-round in favorable conditions, with peak activity often observed during warmer months.
- Preço de mercado: Low (primarily for aquarium trade, bait, or research)
- Importância comercial: low
- Sabor: Not typically consumed due to small size.
- Textura: Not typically consumed due to small size.
- Valor nutricional: Not typically consumed due to small size.
Fatos principais
Live-bearing Reproductionbehavior
Unlike most fish that lay eggs, Poecilia vivipara gives birth to live, free-swimming young, a characteristic that gives it its species name 'vivipara'.
Adaptabilityamazing
This species is remarkably adaptable, thriving in a wide range of water conditions, from pure freshwater to brackish environments, and tolerating varying temperatures and oxygen levels.
Sexual Dimorphismbehavior
Males are significantly smaller and more colorful than females, and possess a distinct gonopodium for internal fertilization, making sex identification straightforward.
Ecological Roleinteresting
Barrigudinhos play an important role in their ecosystems as both consumers of algae and small invertebrates, and as a food source for larger fish and birds.
Aquarium Popularityinteresting
Due to their hardiness, small size, and ease of breeding, Barrigudinhos are popular among beginner aquarists, though often overshadowed by their more colorful cousin, the Guppy.
Informações de segurança
Seguro- Nível de segurança: safe
- Venenoso: Não
- Comestibilidade: not recommended
- Observações de manuseio: No specific handling precautions are required beyond standard fish handling practices to minimize stress to the fish. They are small and harmless.
Espécies similares
Guppy
Poecilia reticulata
While similar in size and reproductive strategy, P. reticulata males typically exhibit more elaborate and varied caudal fin shapes (e.g., fan, sword, delta) and more intense, often larger, color patterns. P. vivipara males generally have a more rounded or slightly truncate caudal fin and less flamboyant coloration.
Mosquitofish
Gambusia holbrooki
Gambusia holbrooki has a more flattened head and a more upward-pointing mouth. Its body is generally more slender, and males have a more pointed, less robust gonopodium. P. vivipara tends to be slightly more robust and has a less pronounced upward mouth.
Molly
Poecilia sphenops (and other Poecilia species)
Most Poecilia sphenops varieties are larger and have a deeper body profile than P. vivipara. While some wild mollies can be similar in coloration, their overall body shape and maximum size are generally distinct.
Classificação científica
- Reino
- Animalia
- Filo
- Chordata
- Classe
- Actinopterygii
- Ordem
- Cyprinodontiformes
- Família
- Poeciliidae
- Gênero
- Poecilia
- Espécie
- Poecilia vivipara
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