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Ctenopharyngodon idella, commonly known as Grass Carp, is a large, herbivorous freshwater fish native to eastern Asia. It is the sole species of the genus Ctenopharyngodon. This species is widely cultured and introduced globally for aquatic weed control, aquaculture, and sport fishing. Its name 'Grass Carp' directly reflects its primary diet of aquatic vegetation. They are known for their rapid growth rate and ability to consume large quantities of plant material, which can significantly alter aquatic ecosystems.
Características físicas
- Formato do corpo
- torpedo
- Coloração
- Dorsal side is typically dark olive to brownish-green, fading to silvery-white on the flanks and belly. Scales often have dark edges, creating a cross-hatched pattern. Fins are generally dusky.
- Tipo de escama
- cycloid
- Posição da boca
- terminal
- Características distintivas
- Elongated, cylindrical body, Large, cycloid scales, Absence of barbels, Short dorsal fin, Pharyngeal teeth specifically adapted for grinding plant material
- Nadadeira dorsal
- Single, short dorsal fin with 3 unbranched and 7 branched rays.
- Nadadeira caudal
- Large, deeply forked caudal fin.
- Nadadeira peitoral
- Relatively short pectoral fins, positioned low on the body.
- Nadadeiras características
- All fins are rayed, lacking spines. The anal fin is short with 3 unbranched and 8 branched rays.
Dicas de identificação
Body Shape
Look for an elongated, torpedo-shaped body, characteristic of a fast-swimming fish.
Coloration
Observe the dark olive to brownish-green back, silvery sides, and white belly. Scales often have a darker outline.
Mouth and Barbels
Note the terminal mouth and the complete absence of barbels, which distinguishes it from common carp (Cyprinus carpio).
Dorsal Fin
The dorsal fin is short and lacks a serrated spine, unlike the common carp.
Pharyngeal Teeth
While not visible externally, their unique comb-like pharyngeal teeth (4-2 or 5-2 formula) are a definitive internal identification feature for ichthyologists, adapted for shredding plant material.
Habitat
- Tipo de água
- freshwater
- Profundidade
- Typically found in shallow to moderately deep waters, often near vegetated areas. Can inhabit depths up to 30 meters but prefers shallower zones for feeding.
- Ambiente
- Prefers large, slow-moving rivers, lakes, reservoirs, and ponds with abundant aquatic vegetation. Tolerant of a wide range of water conditions, including varying temperatures and turbidity. Requires flowing water for successful reproduction.
- Distribuição geográfica
- Native to eastern Asia, specifically the Amur River basin and major rivers of China. Widely introduced globally, including North America, Europe, Africa, and South America, for biological control of aquatic weeds and aquaculture.
Informações sobre aquário
- Nível de cuidado: advanced
- Temperamento: peaceful
- Alimentação: herbivore
- Tamanho mínimo do aquário: Not suitable for typical home aquariums due to large size; requires very large ponds or specialized facilities (thousands of gallons).
- Temperatura: 10-30°C (50-86°F)
- Nível de pH: 6.5-8.5
- Dureza da água: 5-25 dGH
- Compatibilidade: Generally compatible with other large, peaceful fish. Avoid housing with very small fish that could be accidentally ingested or outcompeted for space.
- Requisitos especiais: Requires extremely large, well-filtered aquatic systems with abundant aquatic vegetation or suitable plant-based food. Prone to jumping, so secure enclosures are necessary. Not recommended for typical ornamental aquariums due to their size and ecological impact.
Informações no ambiente natural
- Estado de conservação: least concern
- Sazonalidade: Spawning typically occurs in late spring to early summer when water temperatures rise and river levels are high. Feeding activity is highest during warmer months.
- Preço de mercado: Varies significantly by region and size, often sold for aquaculture stocking or as food fish. Prices can range from a few dollars for fingerlings to tens of dollars for larger specimens.
- Importância comercial: high
- Sabor: Mild, slightly sweet, often described as earthy depending on diet and water quality.
- Textura: Firm, flaky white flesh with some small bones.
- Métodos de preparo: Frying, Baking, Grilling, Steaming, Smoking
- Valor nutricional: Good source of protein, omega-3 fatty acids, and various vitamins and minerals. Low in fat.
Fatos principais
Biological Weed Controlbehavior
Grass Carp are widely used as a biological control agent for nuisance aquatic vegetation in ponds, lakes, and canals. Sterile triploid individuals are often stocked to prevent uncontrolled reproduction and establishment in new environments.
Voracious Herbivoresbehavior
An adult Grass Carp can consume 40-100% of its body weight in aquatic vegetation per day, making them highly effective at controlling plant growth.
Long Lifespan and Sizerecord
Grass Carp can live for over 15 years and reach impressive sizes, with individuals exceeding 1.5 meters (5 feet) in length and weighing over 45 kg (100 lbs).
Jumping Behaviorbehavior
Like some other Asian carp species, Grass Carp are known to jump out of the water when startled, particularly in response to boat noise, which can pose a hazard to boaters.
Ecological Impactinteresting
While effective for weed control, uncontrolled introductions of fertile Grass Carp can lead to significant ecological changes, including habitat alteration, reduction of biodiversity, and impacts on native fish and waterfowl populations due to overgrazing of vegetation.
Informações de segurança
Seguro- Nível de segurança: safe
- Venenoso: Não
- Comestibilidade: edible
- Observações de manuseio: Grass Carp are large and powerful fish. When handling, use appropriate gear (e.g., large nets, gloves) to prevent injury from their strong thrashing. They do not possess venomous spines or other harmful defenses. Care should be taken to support their body weight to avoid internal injury to the fish if releasing.
Espécies similares
Common Carp
Cyprinus carpio
Common Carp have two pairs of prominent barbels around their mouth and a long dorsal fin with a serrated spine. Grass Carp lack barbels and have a short dorsal fin without a spine.
Silver Carp
Hypophthalmichthys molitrix
Silver Carp have a more compressed body, a distinctly downward-turned mouth, and eyes positioned low on the head. They are filter feeders and lack the specialized pharyngeal teeth of Grass Carp.
Bighead Carp
Hypophthalmichthys nobilis
Bighead Carp have a disproportionately large head, a large, upturned mouth, and eyes positioned low on the head. They are also filter feeders and lack the herbivorous adaptations of Grass Carp.
Classificação científica
- Reino
- Animalia
- Filo
- Chordata
- Classe
- Actinopterygii
- Ordem
- Cypriniformes
- Família
- Cyprinidae
- Gênero
- Ctenopharyngodon
- Espécie
- Ctenopharyngodon idella
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