Electric Blue Jack Dempsey

A captive blue colour form of the Jack Dempsey, covered with turquoise to electric-blue spangling over a pale silver or darker base. Pattern, brightness and body tone vary between individuals, and juveniles may look less settled than mature fish.

Treat Electric Blue as a captive variety of Rocio octofasciata. It should not be recorded as an undescribed taxon or with “cf.” unless identification is genuinely uncertain. Separate it from blue acara and Texas-cichlid hybrids by body shape, facial pattern, and documented breeding origin.

Visual sexing is unreliable, especially in juveniles and in the electric-blue form. Mature males are usually larger with longer, more pointed dorsal and anal fins, while females may remain rounder and show darker facial or dorsal markings, but venting or an established pair is more dependable.

Provide a mature, stable aquarium with strong biological filtration, good oxygenation, open swimming room and several caves or visual barriers. Use secure rockwork and leave room for digging because the fish may claim and rearrange a territory.

This is a territorial cichlid that is often less forceful than a standard-colour Jack Dempsey but can still chase or injure tank mates. Many juveniles are shy and slow-growing, and weaker specimens may be outcompeted at feeding time.

Usually kept singly or as a proven compatible pair. Randomly combining adults can lead to injury. A pair needs several visual barriers and enough room for either fish to retreat.

Adults defend caves, hardscape, and spawning surfaces. A breeding pair may claim most of the aquarium and attack other bottom or middle-level fish.

Keeping one specimen or a carefully matched pair is usually safest. In a spacious aquarium it may live with calm, robust fish too large to swallow, but tiny fish, fin-nippers, highly aggressive cichlids and very fast feeders are poor choices.

Stable warm water with moderate mineral content suits most captive lines. Ammonia and nitrite must remain at zero, while nitrate should be controlled through filtration and regular water changes.

Use a quality cichlid pellet as the staple, supported by varied frozen or fresh invertebrate foods and some plant-based material. Feed measured portions and confirm that the fish eats, especially when it shares the tank with quicker or bolder species.

Feed moderate portions and avoid chronic overfeeding. Do not rely on feeder fish, mammalian meat, or a single rich frozen food. Include fibre and plant-based ingredients.

A compatible pair spawns on a cleaned rock or inside a sheltered site, and both parents guard the eggs and fry. Breeding the electric-blue form is more difficult than breeding ordinary Jack Dempseys because pair formation, fertility and fry survival can be less reliable; established breeding programmes commonly use blue-gene fish rather than pairing two electric-blue adults.