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Maximum size : 20 cm

Electric Blue Jack Dempsey - Rocio octofasciata cf : Complete Fish Profile & Care Guide

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The Electric Blue Jack Dempsey (Rocio octofasciata cf) is a mesmerizing colour morph of the Jack Dempsey Central American Cichlid, making it one of the most sought-after freshwater aquarium fish. Its vivid blue colouration sets it apart from its standard-coloured counterparts. Despite its stunning appearance, the Electric Blue Jack Dempsey is relatively small in size compared to its natural variant. Therefore, it requires a spacious aquarium of at least 190 litres, preferably larger. If live plants are a must-have in your aquarium, choose rooted plants that can withstand repositioning or go for thicker-leaved species. These peaceful Cichlids thrive in large aquariums with like-sized, calm tank mates. They are not as aggressive as other Cichlid species and prefer being housed individually or in small groups with only a few other tankmates. However, when breeding, they become fiercely territorial and will defend their nesting sites. To provide these Cichlids with a home, add a cave or a similar structure where they can retreat when threatened. The Electric Blue Jack Dempsey 's stocky body contrasts its brilliant blue colouration with iridescent metallic blue dots and broken lines standing out against the dark brown background. In conclusion, the Electric Blue Jack Dempsey Cichlid is a stunning addition to any aquarium. With its peaceful demeanour and striking colours, it will surely be the centrepiece of your aquatic display.

Electric Blue Jack Dempsey Photos

Sexual Dimorphism

Distinguishing between the genders of Electric Blue Jack Dempsey is a relatively straightforward process. Several physical characteristics can differentiate males and females. Notably, males possess a distinctive round black spot at the centre of their bodies and on the base of their tails. They also have elongated and pointed anal and dorsal fins. In contrast, females display fewer dots, shorter, rounded fins, and a more gravid appearance when ready to breed. These gender differences are valuable to fish enthusiasts and breeders, as they provide an effective means of distinguishing between males and females, facilitating their management and reproduction.

Quick Facts

Scientific NameRocio octofasciata cf
Year Described1903
Other NamesBlue Dempsey, Electric Blue Dempsey, Neon Blue Dempsey, BJD, EBJD
OriginsMexico Guatemala Honduras
Max Size20 cm
Aquarium LevelAll Levels
DifficultyBeginner - Intermediate
Best kept asLoners
Lifespanup to 15 years

Water Parameters

Water TypeFreshwater
PH6.0 - 7.0
GH8 - 12
72 - 86
22.2 - 30

Natural Habitat

The Electric Blue Jack Dempsey is a fascinating cichlid species that can be found in various parts of the world, including Southern Mexico, Yucatan, Central and North America, as well as Guatemala and Honduras. Interestingly, wild populations have also been discovered in places as far-flung as Australia, the USA, and Thailand. These captivating fish are known for their ability to thrive in a range of aquatic environments, including warm, slightly acidic, slow-moving rivers, canals, lakes, bogs, and swampy waters. However, they typically inhabit weedy areas with sandy or muddy substrates, often featuring rocks and debris that serve as prime hiding spots.


The Electric Blue Jack Dempsey is widely recognized as one of the more easily spawned cichlid species. However, as they pair up, these fish may exhibit intolerance and territoriality, resulting in biting behaviour. As egg layers, Dempsey Cichlids are known to construct a nest in the shape of a crater. The female can lay anywhere from 500 to 800 eggs in a single spawning, which is typically applied on meticulously cleaned rocks. Following a gestation period of roughly three days, the eggs will hatch, and the parents will keep the offspring in carefully constructed pits. Both the male and female will diligently guard the eggs until they become free-swimming. At this point, the parents will begin to crush food and release it for the young to consume, ultimately helping them reach a size where they can feed themselves.

Diet & feeding

The Electric Blue Jack Dempsey is an omnivorous Cichlid species that exhibits a diverse feeding habits, consuming various types of food ranging from dried, pelleted, live, and frozen forms such as flakes, bloodworms, brine shrimp, and insects such as grasshoppers, crickets, and fruit flies. To maintain optimal health, feeding adult Electric Blue Jack Dempseys 1 to 2 times daily is recommended, ensuring that the quantity offered is commensurate with their consumption within a two-minute feeding window. Conversely, juvenile Electric Blue Jack Dempseys should be fed more frequently to facilitate their growth and development.

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