Conchfish (Astrapogon stellatus) in Conch
The Conchfish (Astrapogon stellatus), known to tropical fish keeping enthusiasts as the Conch Fish, Conch Cardinalfish or Conch Cardinal, is native to the Western Atlantic Ocean.
Its range extends from Bermuda, southern Florida, and the Bahamas, throughout the Greater and Lesser Antilles, and southward along the coast of South America to Rio de Janeiro, Brazil.
The Conchfish is a cryptic, reef-associated species that during daylight hours are found alone or in pairs hovering motionless within highly specialized, protective marine shelters at depths from 3 to over 130 feet.
During the day in the shallower inshore environments where they are most commonly encountered in depths from 3 to 45 feet, Conchfish are famously found nestling inside the mantle cavities of living Queen Conchs (Aliger gigas), or alternatively sheltering inside large pen shells (Atrina rigida, Pinna carnea) and deep tube sponges.
Although Conchfish will occasionally hover over soft sandy or muddy bottoms near the base of a seagrass bed or reef structure, they will rarely venture out over open sand flats devoid of their preferred living host invertebrates.
Conchfish are strictly nocturnal predators that are fiercely protective of their individual living shelters by day and emerge at night to forage in the open water on small benthic and pelagic shrimp, crabs, copepods, and minor zooplankton.
When a Conchfish hunts in the dark, it relies on its acute sensory system and oversized eyes to target small crustaceans navigating the sand beds. It slips completely out of its host conch at dusk and returns safely inside the living shell before the break of dawn.
Conchfish (Astrapogon stellatus)
The Conchfish has a dark brown to solid black colored body that, along with the head and median fins, is heavily peppered with minute dark spots; a large, oblique, extendable mouth, and oversize eyes with a dark pupil and distinct dark bars that radiate outward across its snout and head. They have two separate dorsal fins, a smooth preopercle (gill cover margin), and large, expansive pelvic fins that reach back to the rear third of the anal fin base.
Males have a larger, broader squared-off jawline to facilitate the physical space required for mouthbrooding, and retain a leaner, more compressed body profile than females which are noticeably plumper.
The Conchfish (Astrapogon stellatus) is often confused with the Blackfin Cardinalfish (Astrapogon puncticulatus), which is a closely related Western Atlantic species that lacks the strict symbiotic relationship with living conchs, opting instead to hide exclusively within empty discarded shells or human litter.
The Conchfish can be housed in a mature FOWLR or reef aquarium of at least 30 gallon capacity with an aragonite sand or bare bottom substrate, plenty of live rock stacked into dark shaded caverns, and deep tube sponges or large, protective shell configurations for alternative shelter. Because they startle easily, a tight fitting mesh or glass lid is mandatory, and a programmable LED with Moonlight setting is recommended to provide subdued lighting and keep them from staying hidden. An oversized protein skimmer, strong filtration system and a small power head is recommended to maintain water quality and provide low to moderate movement.
The Conchfish are reef safe with caution. They will not touch corals or ornamental clams but large specimens will opportunistically eat tiny ornamental shrimp and small worms.
Only purchase a single Conchfish per tank unless you are buying a guaranteed, pre-bonded mated pair. Putting two random Conchfish in a 30 gallon tank will result in severe territorial fighting over preferred hiding spots.
In larger FOWLR or reef tanks Conchfish can be housed with peaceful, non aggressive species that occupy different levels in the tank such as Royal Grammas, Firefish Gobies, Clownfish or Tailspot Blennies. Avoid aggressive predators like Groupers, Lionfish, Eels, Frogfish, large Hawkfish and Wrasses and hyperactive fish like Maroon Clownfish, Dottybacks, large Tangs, Damselfish and large aggressive Angelfish.
The Conchfish is exceptionally rare in the hobby due to its reclusive nature and successfully raising the fry to adulthood is exceptionally difficult.
Unlike Banggai Cardinalfish which release fully formed, large miniature juveniles that can immediately eat baby brine shrimp, Conchfish release tiny, microscopic pelagic larvae that require a dedicated, separate rearing tank equipped only with a very gentle air stone and constant access to specialized, live microscopic copepod cultures.
Conchfish are paternal mouthbrooders that after a brief courtship carry out spawning. A pair will produce a sticky, cohesive, ball-like mass consisting of thousands of extremely small eggs. The male catches the fertilized egg mass in his mouth where he aerates them by churning them and rolling them around. After fasting during the duration of the hatch, the tiny fry are released at night into the plankton rich ocean currents to feed on microscopic copepod nauplii until they become juveniles and eventually adults.
A mature female Conchfish (Astrapogon stellatus) typically produces a clutch of several hundred to over a thousand eggs per spawning cycle.
In the wild, Conchfish are nocturnal ambush predators that feed on zooplankton, mysid shrimp, copepods, amphipods, and small fish fry. In an aquarium environment they should be initially fed live or frozen mysis shrimp, enriched brine shrimp, calanus, and finely chopped seafoods at dusk or dawn. Feed adults 1 or 2 times a day, juveniles 2 to 3 times a day, and post brooding males at least 2 to 3 times a day. Feeding once in the morning and once in the evening replicates their nocturnal schedule.
The Conchfish (Astrapogon stellatus) is rarely available to tropical fish keeping enthusiasts and is seldom seen at online retailers or local fish shops due to the over-harvesting and strict environmental protection of its wild host, the queen conch.
When available, prices generally range from $25.00 to $65.00 depending on size and importer supply.
Because they are not captive bred on a commercial scale, the marine aquarium trade relies entirely on accidental or rare wild-caught imports from the Caribbean. They are usually only available by special request.
Conchfish (Astrapogon stellatus)
Minimum Tank Size: Single specimen 30 gallons
Aquarium Type: FOWLR or Reef
Care Level: Moderate (due to extreme shyness and specialized sheltering needs)
Temperament: Semi-Aggressive
Aquarium Hardiness: Hardy
Water Conditions: 72-78° F, dKH 8 – 12°, pH 8.1-8.4, sg 1.020-1.025
Max size: 3.0”
Color Form: Brown, Dark Brown, Black
Diet: Carnivore
Compatibility: Reef Safe with Caution
Origin: Western Atlantic, Caribbean Sea, Bahamas, southern Florida down to Brazil
Family: Apogonidae
Lifespan: 3-5 years
Aquarist Experience Level: Intermediate/Advanced
