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Overview

Heros appendiculatus, also sold as Blue Turquoise Severum, is a large South American cichlid valued for its deep body, attentive behavior, and blue-turquoise reflections. Native to Colombia, it suits aquarists able to provide a spacious aquarium, warm water, and a structured layout. This form remains uncommon in the aquarium trade, making it appealing to keepers interested in regional cichlids. The specimens offered here are wild-collected; their acclimation therefore requires particular attention to water quality, feeding, and a calm environment. A stable aquarium and a gradual transition are especially important during the first weeks in captivity.

General species description

Heros appendiculatus is a severum-type cichlid with a laterally compressed body and well-developed fins. It is recognized by an overall blue-green to turquoise coloration, often marked with darker patterns on the flanks and fins. Like several large South American cichlids, it combines a relatively peaceful nature with a strong personality, especially once mature or paired. It appreciates aquariums furnished with shelter areas and open swimming space. Its trade availability is intermediate: it is less frequently offered than the most common captive-bred severums. Wild specimens may also show changes in color related to mood, social rank, and surroundings. A large aquarium is essential for maintaining this fish properly. Its size, territorial behavior, and need for stable conditions make it better suited to experienced aquarists than to small community aquariums.

Geographic origin and biotope

Heros appendiculatus is associated with the Amazonian drainage of Colombia, particularly calm or moderately flowing waters in floodplain environments. Its natural habitat includes side channels, shallow margins, creeks, and areas bordered by submerged wood. The water is generally warm, soft, and slightly acidic to neutral, sometimes amber-colored because of dissolved organic matter. Banks may be covered with dense vegetation, roots, and accumulated leaf litter, providing many shelters. The bottom is commonly made up of fine sand, mud, and plant debris. In an aquarium, these conditions can be approximated with effective filtration, moderate current, and a layout of roots and smooth stones. Wild-collected specimens benefit from gradual acclimation because sudden changes in temperature or water chemistry can weaken them.

Precise location and local name

Aquarium references associate this form with the Colombian Amazon drainage, but the exact locality should not be generalized to every shipment sold under this name. In the trade, it is mainly known as Heros appendiculatus and Blue Turquoise Severum. The word “severum” is widely used by aquarists for several cichlids in the genus Heros, even though geographic populations and forms may differ in appearance. To preserve the traceability of wild fish, it is best to keep the collection information supplied with the shipment. This is particularly useful for a less common fish whose commercial identification may sometimes be simplified. When no exact locality appears on the label, Colombian Amazonia is a safer general origin than assigning a specific river without supporting information.

Appearance and physical characteristics

Heros appendiculatus has a deep, oval, laterally compressed body typical of severums. The dorsal and anal fins are elongated, while the caudal fin remains fairly rounded. Its coloration may range from blue-green and turquoise to grayish green, with iridescent tones that become more visible under soft lighting. Juveniles are often less colorful than adults and may display vertical bars or stronger contrasts. The head is robust, with a mouth suited to grazing and taking small food items. The fins may show reddish or orange tones depending on the individual. Color usually intensifies when the fish is settled, well fed, and maintained in stable water. Its most sought-after feature is the blue-turquoise sheen combined with a substantial body shape. Adult size and territorial behavior require a layout without sharp edges.

General diet

Heros appendiculatus is omnivorous, with an important tendency to consume plant matter, algae, and small organisms associated with the substrate. In an aquarium, its staple diet can consist of quality pellets for large cichlids, supplemented with foods containing plant ingredients such as spirulina. Blanched vegetables including zucchini, spinach, or peas may be offered in small amounts. Frozen meaty foods such as brine shrimp, krill, or mosquito larvae can be used as supplements, but should not dominate the diet. Wild specimens may initially accept food cautiously; several small meals can help them adjust. A varied diet supports better coloration, steady growth, and good overall condition. Overfeeding should be avoided because Heros appendiculatus is a greedy and opportunistic feeder. Removing leftovers helps maintain clean, stable water and reduces the risk of unnecessary organic buildup.

Essential data

• Native river: Colombian Amazon drainage
• Local name used: Severum; Blue Turquoise Severum in the aquarium trade
• Origin of the scientific name: Heros is a genus name of Greek inspiration; appendiculatus is a Latin descriptive term
• Meaning of the full name: Heros means hero; appendiculatus means bearing an appendage or projecting structure
• Common/vernacular names: Blue Turquoise Severum; turquoise severum
• Family: Cichlidae
• Subfamily: Cichlinae
• Name pronunciation: heh-ross app-en-dick-you-LAH-tuss
• Discovery: Francis de Laporte de Castelnau, 1855
• Maximum adult size: About 25 cm
• Water temperature and pH: 24 to 30 °C; pH 5.5 to 7.5
• Watercourse appearance and surrounding vegetation: Calm to moderate water, roots, submerged wood, leaf litter, and dense bank vegetation
• Typical tankmates: Geophagus steindachneri, Andinoacara pulcher, Caquetaia kraussii, Hypostomus watwata, Pimelodus pictus
• Temperament and behavior: Generally peaceful for a large cichlid, but territorial as a pair and during spawning
• Water depth: Shallow to moderately deep margins and side channels
• Sexual dimorphism: Limited; mature males may be larger and develop more extended fins
• Bottom structure and flow: Sand, mud, and plant debris; low to moderate current

In your aquarium

To succeed with Heros appendiculatus, provide a spacious, well-filtered aquarium with roots, shelters, and open swimming areas. Warm, soft to slightly acidic water, regular water changes, and a varied diet support acclimation. Because these are wild-collected fish, monitor appetite and behavior carefully during the first few weeks. Avoid tankmates that are very small or aggressive, particularly once a pair establishes a territory. Stability is more important than chasing extreme water values. With enough space, a safe layout, and good water quality, this uncommon severum can become an impressive centerpiece cichlid in a carefully planned large community aquarium.