Tailspot Cardinal (Apogon dovii)
The Tailspot Cardinal (Apogon dovii), known to tropical fish keeping enthusiasts as the Tailspot Cardinalfish, Onespot Cardinalfish, Tailspot Flame Cardinalfish, Tail-striped Cardinalfish, Dottyback Cardinal, and Cardenal Colimanchada, is native to the Tropical Eastern Pacific Ocean.
Their range extends from Mazatlán, Mexico, southward along the coast of Central America including El Salvador, Guatemala, Honduras, Nicaragua, and Costa Rica, down to Ecuador and northern Peru. It is also frequently documented around offshore oceanic islands such as the Cocos Islands and the Galápagos Islands.
The Tailspot Cardinal is a cryptic reef-dwelling species that during daylight hours are found alone, in pairs, or in small social groups hovering motionless in the deep rock pockets, rocky crevices, and coral recesses of their range along steep vertical drops and sheltered marine structures at depths from 10 to over 150 feet
Tailspot Cardinals are nocturnal planktivorous predators that remain close to protective structure by day and merge into loose aggregations to forage in the open water column on zooplankton, pelagic fish larvae, pelagic fish eggs, mysid shrimp, and small crustaceans at night.
During the day in the shallower inshore environments where they are most commonly encountered in depths from 10 to 45 feet, Tailspot Cardinals are often found nestling between protective reef caves, rocky overhangs, and shaded ledges.
Although Tailspot Cardinals will occasionally hover near bottom structures, they will rarely venture out over open sand or mud flats devoid of overhead cover.
Tailspot Cardinal (Apogon dovii)
The Tailspot Cardinal has a solid pink to translucent red or vibrant deep red colored body with a large, distinct, round black spot on the caudal peduncle just at the base of the tail fin; a large mouth, and oversize eyes with a dark pupil and a broad dusky stripe bordered by white lines extending from the snout through and behind the eye to the edge of the gill cover. They possess two separate, symmetrical dorsal fins, and a moderately concave tail fin.
Juvenile Tailspot Cardinals have a striking yellow body color with a distinctive black spot near the tail base. As they mature, their colors intensify, and additional markings become more pronounced, creating a visually stunning display of reds, yellows, and blacks.
Minimal sexual dimorphism does exist with Apogon dovii. Breeding males can temporarily lose the bold black spot on their caudal
Tailspot Cardinal (Apogon dovii)
peduncle to become plain red with dark markings on their unpaired fins. Females have a noticeably plumper body profile, especially during spawning periods.
The Tailspot Cardinal (Apogon dovii) is often confused with the Mediterranean Cardinalfish (Apogon imberbis), which is a closely related but distinctly different Eastern Atlantic and Mediterranean species that looks exceptionally similar, to the extent that Albert Günther originally suggested considering them the same species without regard to their entirely separate geographic ranges.
The Tailspot Cardinal can be housed in a mature FOWLR or reef aquarium of at least 30 to 40 gallon capacity with an aragonite sand substrate, and plenty of live rock stacked into dark shaded caverns, ledges, and overhangs for them to shelter among. Because they startle easily, a tight-fitting mesh or glass lid is mandatory, and low-light or programmable LED settings are recommended to provide subdued lighting and keep them from staying hidden. A reliable filtration system and low to moderate water movement are recommended to maintain pristine water quality.
The Tailspot Cardinal is reef safe and makes an excellent choice for a well established coral reef aquarium. They will not bother corals or ornamental clams, but they naturally consume tiny invertebrates; which means that small prized ornamental shrimp and tiny worms may be opportunistically eaten.
Tailspot Cardinals have a peaceful demeanor and are slow swimming, making them excellent candidates for a community tank where they can be kept singly or in small social groups of three or more individuals when provided with sufficient space.
In larger aquariums, Tailspot Cardinals can be housed with peaceful, non-aggressive species like Banggai Cardinalfish, Firefish Gobies, Royal Grammas, Coral Beauties, Six-Line Wrasses, or Tailspot Blennies. Aggressive predators like Groupers, Lionfish, Eels, and hyperactive or overly territorial fish should obviously be avoided.
The Tailspot Cardinal is a paternal mouthbrooder where the male carries out oral brooding of the fertilized eggs. Like other related species in the family Apogonidae, they produce a cohesive egg mass consisting of several hundred demersal, relatively large eggs that the male catches and aerates inside his mouth, fasting during the entire 3 to 7 day brooding period. The male releases the tiny 2 mm to 4 mm pelagic larvae into ocean currents to feed on microscopic plankton for several weeks before they settle downward onto the reef and transforming into recognizable juveniles.
Successfully raising the tiny larvae to adulthood in a home aquarium environment is exceptionally difficult and requires dedicated rearing tanks and constant access to specialized live microscopic copepod cultures.
In the wild, Tailspot Cardinals are nocturnal carnivores that feed primarily on zooplankton, tiny crustaceans, and suspended marine organisms. In an aquarium environment, they should be fed a varied carnivorous diet including live or frozen mysis shrimp, enriched brine shrimp, flake foods, pellets, and finely chopped seafoods. Adults should be fed 1 or 2 times a day, ideally at dusk or dawn, to replicate their natural nocturnal foraging schedule and maintain their health.
The Tailspot Cardinal (Apogon dovii) is occasionally available to tropical fish keeping enthusiasts from specialized online retailers, wholesalers, and local fish shops at prices that vary according to size, vendor, and area of collection. Current online pricing ranges for Small (under 2 inches): ~$45.00 to $49.00, Medium (2 to 3 inches): ~$52.00 to $67.00, Large (3 to 4 inches): ~$74.00 to over $93.00.
Because they are rarely captive-bred on a commercial scale, the marine aquarium trade relies on wild-caught imports from the tropical Eastern Pacific, particularly regions like Costa Rica and Nicaragua.
Tailspot Cardinal (Apogon dovii)
Minimum Tank Size: Single specimen 30-40 gallons
Aquarium Type: FOWLR or Reef
Care Level: Easy
Temperament: Peaceful, Non-aggressive
Aquarium Hardiness: Very Hardy
Water Conditions: 72-80° F, dKH 8–12°, pH 8.1-8.4, sg 1.023-1.025
Max size: 3.9”
Color Form: Red, Pink, Shimmering Silver, Black
Diet: Carnivore
Compatibility: Reef Safe with Caution
Origin: Eastern Pacific Ocean, Mexico to Peru, Galápagos
Family: Apogonidae
Lifespan: 5+ years
Aquarist Experience Level: Beginner / Advanced
