Amphilophus citrinellus

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Amphilophus citrinellus, also called the Midas Cichlid, is a large Central American cichlid recognized for its powerful body, massive head, and assertive behavior. Native to the great lakes of Nicaragua, it has become a spectacular aquarium fish for keepers able to provide a very large setup. Its coloration ranges from grayish brown to yellow or orange, depending on the variety and its mood. Despite its attractive appearance, it requires serious planning: as an adult, it becomes territorial and may intimidate or injure quieter tank mates. Successful care depends on space, strong filtration, and a varied diet.

General species description

The Amphilophus citrinellus is a robust and territorial cichlid valued for its very noticeable personality. It mainly inhabits lake margins, where it explores the bottom, defends a territory, and may shift substrate. In aquaria, its behavior changes with age: juveniles can appear fairly tolerant, while adults become much more assertive, especially during breeding. This fish should be reserved for substantial aquariums equipped with effective filtration and sturdy shelters. A formed pair may occupy much of the layout and drive away other fish. Its temperament makes it better suited to a Central American cichlid aquarium than to a standard community tank. Captive-bred specimens are common in the trade, making the species generally accessible to aquarists. **Adult territoriality** and **large final size** should guide aquarium planning from the beginning.

Geographic origin and biotope

The Amphilophus citrinellus is native to Nicaragua, particularly Lake Nicaragua and Lake Managua and their watersheds. Country of reference: Nicaragua. Its natural habitat includes lake margins, bays, and areas associated with streams that feed or drain these lakes. The water is generally warm, neutral to alkaline, and well oxygenated, with sand, gravel, and stones on the bottom. Aquatic vegetation may occur in sheltered areas, but rocky or open sections are also common. To reproduce this setting, use stable rocks, shelters, and an open swimming area. Good water movement is important, without creating excessive current throughout the aquarium. The **biotope of Nicaragua’s great lakes** is therefore more open and mineral-based than a densely planted aquarium. Fragile plants may be uprooted by a fish that regularly digs and rearranges its territory.

Precise location and local name

Within its natural range, the Amphilophus citrinellus is associated with the basins of Lake Nicaragua and Lake Managua in Nicaragua. The English common name **Midas Cichlid** is widely used in the aquarium trade and refers to the golden coloration seen in several selected forms. In Spanish-speaking areas, the word “mojarra” may be used for local cichlids, although it does not always refer exclusively to this species. In Canadian aquaria, “Midas cichlid” is usually the clearest common name. Golden forms should also not be confused with hybrids or with other yellow-colored cichlids. The **Lake Nicaragua and Lake Managua region** is the main geographic reference for this species. Commercial names may vary with coloration, but the scientific name remains the best identification tool.

Appearance and physical characteristics

The Amphilophus citrinellus has a deep, powerful body, a broad head, and a relatively large mouth. Adult males often develop a more pronounced nuchal hump, especially when old or dominant. Wild coloration is generally grayish, olive brown, or blue-gray, while yellow, orange, and mottled individuals are common in captivity. Dark markings may appear or intensify with mood, stress, and social conditions. The dorsal and anal fins extend toward the rear, giving the fish an imposing profile. Adult length may approach **35 cm**, although many specimens remain smaller depending on their rearing conditions. The massive body, large head, and **male nuchal hump** are especially recognizable features. Coloration alone, however, is not enough to determine sex or the exact identity of a strain.

General diet

The Amphilophus citrinellus is an opportunistic omnivore. In nature, it consumes invertebrates, small fish, bottom-dwelling organisms, and various plant materials. In aquaria, the staple diet should be a quality food formulated for large cichlids, offered in appropriately sized portions rather than excessive amounts. You can alternate pellets, frozen foods such as shrimp or worms, and preparations containing plant matter. Juveniles benefit from more frequent meals, while adults should be fed more carefully to prevent obesity and water pollution. Regularly feeding mammals or feeder goldfish is best avoided because these foods are unbalanced and may contribute to health problems. A **varied but controlled diet** supports growth and coloration. Uneaten food should be removed quickly, since this large cichlid already produces a significant organic load.

Essential data

• River of origin: San Juan River basin
• Local name used: Midas cichlid; mojarra
• Origin of the scientific name: Amphilophus is a genus name created for American cichlids; citrinellus refers to a lemon-yellow coloration.
• Etymology of the full name: Amphilophus: a genus name of Greek origin associated with a margin or crest; citrinellus: a Latin diminutive related to lemon yellow.
• Common/vernacular names: Midas Cichlid, Midas cichlid, mojarra
• Family: Cichlidae
• Subfamily: Cichlinae
• Pronunciation: am-fi-lo-fuss sit-ri-nel-luss
• Discovery: Albert Karl Ludwig Gotthilf Günther, 1864
• Maximum adult size: About 35 cm
• Water temperature and pH: 24 to 28 °C; pH 7.0 to 8.5
• Appearance of the watercourse and surrounding vegetation: Warm lake margins, rocky or sandy areas, variable and often sparse vegetation
• Typical tank mates: Parachromis managuensis, Hypsophrys nicaraguensis, Paraneetroplus maculicauda
• Temperament and behavior: Territorial, robust, digging, and particularly aggressive while breeding
• Water depth: Shallow to moderately deep shoreline areas
• Sexual dimorphism: Males are often larger, with a nuchal hump and more developed fins; juveniles can be difficult to sex
• Bottom structure and flow: Sand, gravel, and stones; calm to moderately moving water

For greater success

Success with the Amphilophus citrinellus depends mainly on a very large aquarium, a firmly secured layout, and oversized filtration. A pair can become extremely territorial during spawning, so tank mates must be selected carefully and should be of comparable size. Maintain warm, stable, clean water, provide rocks that create shelters, and leave a large open swimming area. Soft plants are rarely long-lasting in its territory. Watch for injuries, stress, and waste accumulation. With **ample space**, **stable water**, and a balanced diet, this cichlid can remain a fascinating aquarium fish for many years.