Marine Betta (Comet)
Calloplesiops altivelis
The Marine Betta is a stunning, slow-moving predator with massive, star-speckled fins. Shy by nature, it demands a spacious reef aquarium with deep, dark caves to feel secure.
Temperatura da água
24 - 27 °C
Valor de pH
8.1 - 8.4
Tipo de água
Marinho
Nível do tanque
Parte inferior e intermediária
Tamanho adulto
20 cm
Volume mínimo do tanque
300 L
Grupo mínimo
>= 1
KH
10 - 15 dKH
Descrição da espécie
Geographical Origin and Habitat: Widespread in the Indo-Pacific (from the Red Sea and East Africa to Tonga and southern Japan). Populates coral reefs, hiding by day in caves or crevices.
Taxonomy and Morphology: Comet or Marine Betta (Calloplesiops altivelis). Beautiful marine fish (Plesiopidae family). Reaches 20 cm (8 inches). Characterized by enormous pelvic, dorsal and anal fins, and a fake "eye" (ocellus) on the base of the dorsal fin.
Social Behavior: Very shy nocturnal predator. Spends daylight hours hidden in the caves of the rockwork. If frightened, it slips into a crevice leaving its tail with the ocellus exposed, mimicking the head of a dangerous moray eel (Gymnothorax meleagris).
Coloration and Sexual Dimorphism: Spectacular coat: dark brown or black background dotted with hundreds of tiny white or blue spots, resembling a starry sky. No obvious sexual dimorphism.
Cuidado, criação e companheiros de tanque
Aquarium Setup: Marine aquarium of at least 300 liters (80 gallons). A rich live rockwork forming deep and dark caves is indispensable. Moderate lighting or abundant shaded areas.
Diet and Feeding: Pure carnivore. Often difficult to wean to inert food. Feed with mysis shrimp, krill, pieces of squid and fish or clam meat. May ignore dry food.
Water Quality: Requires stable marine parameters: salinity 1.023-1.025, pH 8.1-8.4, excellent skimming to remove the organic load of protein meals.
Compatibility and Cohabitation: Reef-safe "with caution": it does not touch corals, but will devour any ornamental shrimp (Lysmata, Thor) or small fish (small gobies) that passes by. Coexists well with angelfish, surgeonfish and moray eels.
Aquarium Breeding: Rare but possible. Oviparous species that lays adhesive eggs in caves. The male guards and ventilates the brood until hatching. Weaning the tiny marine larvae is for experts.
Risks and Diseases: Very robust fish once acclimated and weaned. The main risk is death from starvation in the first weeks if stressed by overly aggressive tankmates who steal its food.
Origem e distribuição geográfica
Widespread in the Indo-Pacific (from the Red Sea and East Africa to Tonga and southern Japan). Populates coral reefs, hiding by day in caves or crevices.
Origem
Oceanos tropicais e recifesÁfrica e MadagascarLeste Asiático
Perfil de peixe
- Temperamento
- Semi-aggressive
- The Marine Betta is a peaceful, shy, and largely nocturnal species that is highly non-aggressive toward unrelated tankmates. They spend much of the day hidden in caves, exhibiting a slow and graceful swimming style when they do emerge. However, they are nocturnal predators and will readily consume any small fish or ornamental shrimp that can fit into their relatively large mouths. They are known for a fascinating defensive behavior where they mimic the head of a moray eel by exposing their tail spot when threatened.
- Dieta
- Omnivore
- As obligate carnivores, Marine Bettas require a diet rich in high-quality meaty foods to thrive. In the wild, they hunt small fish and crustaceans under the cover of darkness. In captivity, they should be fed a variety of fresh or frozen foods such as mysis shrimp, krill, chopped seafood, and enriched brine shrimp. While newly introduced specimens may initially require live food like ghost shrimp to stimulate feeding, they can usually be trained to accept frozen foods with patience.
- Expectativa de vida
- 10-15 years
- Tamanho adulto
- 20 cm
- Proporção sexual
- Solitary
- In the home aquarium, the Marine Betta is best kept singly unless a compatible male-female pair can be acquired. These fish are not sexually dimorphic, making visual sexing impossible, which makes establishing a pair challenging for hobbyists. Attempting to keep multiple individuals in the same tank without adequate space and hiding spots will lead to territorial aggression and fighting, especially between males. If keeping more than one specimen is desired, a very large aquarium with numerous caves and visual barriers is necessary to allow each fish to claim its own territory.
- Frequência de alimentação
- Twice daily
- In the aquarium, the Marine Betta should ideally be fed once or twice daily to maintain its health and energy levels. Because they are nocturnal and naturally cautious, it is often best to feed them during evening hours or when the main aquarium lights are dimmed. Slow target feeding with a pipette or feeding tongs can help ensure they receive enough food before faster tankmates consume it all. Monitoring their body condition will help determine if the feeding frequency needs adjustment, particularly during their initial acclimation phase.
- Carga biológica
- Medium
- The Marine Betta is a relatively large, carnivorous fish that produces a moderate amount of biological waste, placing it in the medium bioload category. Because of its diet, which consists mainly of meaty foods, a high-quality filtration system is essential to manage organic waste and prevent nitrate buildup. The use of an efficient protein skimmer, along with regular water changes, is strongly recommended to maintain the pristine water conditions this species requires. While their sedentary nature helps keep their metabolic rate relatively low, their waste output still necessitates robust biological filtration.
- Fluxo
- Moderate
- Calloplesiops altivelis needs steady, moderate circulation distributed across the aquarium rather than a narrow, forceful jet. Marine aquarium of at least 300 liters (80 gallons). A rich live rockwork forming deep and dark caves is indispensable. This preserves useful water exchange while retaining calmer shelter for rest and feeding.
- Risco de salto
- No
- Reprodução
- Oviparous
- Reproduction of the Marine Betta in captivity is possible but considered difficult due to the challenges of pairing and raising fry. They are cave spawners, with the female depositing adhesive egg masses containing hundreds of eggs onto the roof of a cave. The male is a dedicated guardian, aggressively defending the nest and fanning the eggs until they hatch in about five to six days. Successfully raising the larval fry requires specialized live foods, such as rotifers and copepods, and a dedicated rearing tank.
- Compatibilidade e companheiros de tanque
- With caution
- The Marine Betta is highly compatible with medium to large, peaceful tankmates that will not outcompete it for food or harass it. Suitable companions include larger wrasses, tangs, angelfish, and peaceful bottom dwellers like gobies or blennies. They must not be housed with small, bite-sized fish (such as small neon gobies or micro-chromis) or ornamental shrimps (like sexy shrimp or peppermint shrimp), as these will be viewed as prey. Conversely, aggressive tankmates like large damselfish or triggerfish should be avoided, as they will cause the Marine Betta to remain permanently hidden.
- Nível do tanque
- Middle/Bottom
- This species is primarily a cave-dwelling fish that prefers the bottom and middle zones of the aquarium where rocky structures and crevices are abundant. They spend much of their time hovering near the substrate, under ledges, or deep within caves to feel secure. They rarely venture into the open upper water column, except occasionally during feeding times or under very dim lighting. Providing a complex rockwork layout is crucial to mimic their natural habitat and encourage normal swimming behavior.
Modelos e parâmetros científicos
FishBase
Acesso aos dados científicos oficiais da espécie
FishBase v25.04Dados sincronizados em: 15/06/2026
- Nível trófico
- 4 ± 0,65 se
- Resiliência
- Média (1,4 - 4,4 anos)
- Unicidade filogenética (PD50)
- 0.75
- Relação bayesiana comprimento-peso
- a = 0.01995, b = 3.01
- VulnerabilidadeVulnerabilidade baixa (10 / 100)
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