Arrow Cichlid (Amphilophus zaliosus) Care Guide
Amphilophus zaliosus is a slender, elongate cichlid endemic to Lake Apoyo in Nicaragua and rated Critically Endangered by the IUCN.
Compiled by Aquairi from published sources · Published · Updated
Overview
Amphilophus zaliosus, the Arrow cichlid, was described by Barlow in 1976 and belongs to the Midas cichlid species complex. It has a distinctly elongate, slender body and a silver to greenish-grey ground colour that lacks the yellow seen in some relatives; breeding individuals can turn almost entirely black.
Taxonomy
- Family: Cichlidae
- Genus: Amphilophus
- Scientific name: Amphilophus zaliosus
- Describer: Barlow, 1976
- Member of the Midas cichlid species complex
Habitat
The species is endemic to Lake Apoyo, a crater lake in Nicaragua, which it shares with several other Amphilophus species. Research suggests this group evolved within the lake through sympatric speciation.
Tank requirements
- Minimum tank volume: 350 L
- Temperature: 24-28 °C (75-82 °F)
- pH: 7.5-8.5
- GH: 10-20 °dGH
- Lifespan: 8-12 years
Diet
The record classifies Amphilophus zaliosus as a carnivore. Its elongate body shape is associated with a more open-water, pelagic foraging style within Lake Apoyo. In the aquarium it should be offered varied meaty and prepared foods.
Compatibility
It is a semi-aggressive, territorial cichlid best housed with similarly sized Central American species in a spacious tank, avoiding small or delicate fish.
Conservation status
IUCN Red List: Critically Endangered. It is the only endemic Lake Apoyo cichlid so far formally evaluated, and likely has a smaller population than several related species in the same lake.
Amphilophus zaliosus Breeding Guide
Overview
Amphilophus zaliosus, the arrow cichlid, is an elongate species in the Midas cichlid complex endemic to crater Lake Apoyo in Nicaragua, where it evolved by sympatric speciation alongside several related species. It is assessed as Critically Endangered on the IUCN Red List. As a member of the complex it is a biparental substrate-spawner, and parents have been documented performing brood defence.
Sexing
Species-specific external sexing characters are not well documented in the sources consulted. As with related complex members, males are generally expected to be the larger sex, but reliable sexing of zaliosus is best confirmed by observing spawning behaviour and the ovipositor.
Conditioning
The species reaches about 20 cm and is benthopelagic in its native lake. Conditioning a compatible pair on a varied diet in stable, hard, alkaline water consistent with its crater-lake origin provides the basis for spawning.
Breeding Setup
- Hard, alkaline water in keeping with its Lake Apoyo crater habitat.
- Rockwork and a sand substrate to allow pit-digging and provide spawning surfaces.
- A large tank, given the open-water (benthopelagic) habits of this slender species.
- Note: the arrow cichlid is Critically Endangered, so captive lines should be managed responsibly.
Spawning Behavior & Trigger
The arrow cichlid lacks the yellow background typical of many Nicaraguan Amphilophus; its base colour is silver to greenish-grey, and breeding specimens can turn entirely black. As a substrate-spawner, the pair selects and cleans a spawning site; documented brood-defence behaviour confirms active parental guarding.
Egg & Fry Care
Detailed egg counts and fry timelines specific to A. zaliosus are not provided in the sources consulted. As a biparental complex member, both parents guard the eggs and resulting fry; first foods for free-swimming fry are typically brine shrimp nauplii, as for related Amphilophus.
Common Challenges
Because detailed captive-breeding data for this species is limited, this guide is presented partly at the level of the Midas cichlid complex, with an explicit note where species-specific data is lacking. The recorded breeding type is substrate-spawner, matching the biparental substrate-spawning of the complex described by the sources used here.