Iberian Toothcarp (Aphanius iberus) Care Guide
A small euryhaline killifish endemic to Spain's Mediterranean coast, suited to hard alkaline water and a single-species setup.
Compiled by Aquairi from published sources · Published · Updated
Overview
Aphanius iberus is a small toothcarp endemic to the Mediterranean coast of Spain. Adults rarely exceed about 5 cm in length, with males showing bluish to silver vertical bars and females a greenish-brown body with darker blotches. The species tolerates a wide range of salinity, which lets it occupy coastal habitats where few other fishes persist.
Taxonomy
- Family: Cyprinodontidae
- Genus: Aphanius
- Scientific name: Aphanius iberus
- Common synonym: Spanish Toothcarp
Habitat
The natural range runs along Spain's Mediterranean coast, historically from the wetlands of Alt Empordà south to the Adra River in Almería, including the Ebro Delta and Mar Menor lagoon system. It lives in shallow, slow-moving waters such as river mouths, coastal lakes, salt marshes and ponds. Being euryhaline, it ranges from fresh water to highly saline conditions, and populations have retreated into more saline pockets where they avoid competition with introduced mosquitofish (Gambusia).
Tank requirements
- Minimum tank volume: 40 L
- Temperature: 16-26 °C (61-79 °F)
- pH: 7.5-8.5
- GH: 15-30 °dGH
- Lifespan: 2-4 years
Sources note this species is active across a wide temperature range and does poorly in acidic water. Many keepers add a small amount of marine salt, reflecting the brackish origins of most stock.
Diet
Aphanius iberus is an omnivorous micropredator. In the wild it feeds on insects, small crustaceans, worms and algae. In aquaria it takes small live and frozen foods such as Artemia, Daphnia and bloodworm, supplemented with quality dried foods containing Spirulina.
Compatibility
This is a poor choice for a mixed community because of its specific water needs and aggressive spawning behaviour. It is best kept alone as a single-species group, with two or three females per male to spread male attention. Long-finned community fish should be avoided.
Breeding
It is a fractional (repeat) spawner that breeds from roughly April to September. Eggs are attached to algae by fine filaments and hatch in about one to two weeks. Free-swimming fry accept newly hatched Artemia almost immediately.
Conservation status
IUCN Red List: Near Threatened. The species declined sharply in the late 20th century due to habitat loss and the spread of introduced mosquitofish, and a number of historical populations have been lost.
Aphanius iberus Breeding Guide
Overview
Aphanius iberus, the Iberian or Spanish toothcarp (family Aphaniidae), is endemic to the Mediterranean coast of Spain, where Wikipedia and FishBase report it from lagoons, salt marshes, swamps and estuaries in lowland waters with minimal current. It is euryhaline, tolerating salinity up to about 57 ppt. The IUCN lists it as Near Threatened (2023), and it is threatened by habitat loss and the introduced mosquitofish Gambusia affinis.
Sexing
FishBase gives males to about 5.5 cm and females to 5.4 cm total length. Males show the blue-and-silver display colouration, while females are larger-bodied at equivalent age and more subdued.
Conditioning
An egg-laying carnivore, the species conditions well on small live and frozen invertebrates. Wikipedia notes maturity at about three months. Slightly brackish hard water suits it; FishBase lists pH 6.5-7.5 and a broad temperature tolerance of 10-32 C.
Breeding Setup
A well-planted tank with fine-leaved plants or filamentous algae provides the egg-laying sites. As a brackish-tolerant species, slightly saline hard water mirrors its coastal-lagoon origins and suits both adults and developing eggs.
Spawning Behaviour & Trigger
Spawning is seasonal, running roughly April to September (FishBase), or April-August in southern populations and May-August in the Ebro Delta (Wikipedia). Females spawn repeatedly each season, producing from about 100 to 900 eggs, deposited on aquatic plants or filamentous algae.
Egg & Fry Care
Wikipedia gives hatching at approximately 8 days after laying. Eggs can be left on plants in a low-predation tank or transferred for separate incubation; fry take small live foods once free-swimming.
Common Challenges
As a threatened species, captive maintenance of genetically managed stock is important; predation by adults on eggs and fry, and competition from any introduced Gambusia, are key risks. Seasonal cooling and a brackish, hard-water setup help cue spawning.