JACK DEMPSEY ELECTRIC BLUE (Cichlasoma octofasciatum var.)

The Electric Blue Jack Dempsey is a striking colour form of the classic Jack Dempsey cichlid, prized for its intense electric-blue coloration, bold personality, and impressive presence in a large freshwater aquarium. At Monster Aquarium Canada, this fish is an excellent choice for aquarists looking for a colourful, interactive Central American cichlid with the attitude and character associated with Jack Dempseys.

Species Overview

The Electric Blue Jack Dempsey is commonly sold under the scientific name Cichlasoma octofasciatum var., although modern taxonomy generally places the species under Rocio octofasciata. It is a selectively bred colour form rather than a completely separate species.

Electric Blue specimens can display brilliant blue tones across the body, fins, and face. Individual coloration varies with genetics, age, diet, water quality, and aquarium conditions.

Scientific Name

Rocio octofasciata / Cichlasoma octofasciatum var.

Common Names

• Electric Blue Jack Dempsey
• Electric Blue Dempsey
• Blue Jack Dempsey
• Jack Dempsey Cichlid

Origin

The original Jack Dempsey is native to parts of Central America, including Mexico and surrounding regions. The Electric Blue form found in the aquarium trade is a selectively bred ornamental variety.

Appearance and Coloration

The Electric Blue Jack Dempsey is recognized for its vivid blue coloration. Instead of the darker, heavily patterned appearance of traditional Jack Dempseys, Electric Blue specimens can develop bright blue, turquoise, and metallic tones.

The body is typically oval and laterally compressed, with long dorsal and anal fins and a powerful mouth suited to an omnivorous predatory diet.

As the fish matures, the blue coloration can become increasingly prominent. Good nutrition, clean water, stable parameters, and low stress can help maintain strong coloration.

Why Choose an Electric Blue Jack Dempsey?

The Electric Blue Jack Dempsey combines the personality of a Central American cichlid with an eye-catching colour pattern.

Key features include:

• Brilliant electric-blue coloration
• Interactive and intelligent behaviour
• Hardy when properly maintained
• Excellent centerpiece fish
• Strong personality
• Attractive flowing fins
• Suitable for experienced cichlid keepers
• Unique alternative to standard Jack Dempseys

Aquarium Setup

Electric Blue Jack Dempseys require a spacious aquarium with strong filtration and plenty of swimming room.

A 75-gallon aquarium or larger is a practical starting point for an adult specimen, while larger aquariums are strongly recommended for pairs or community arrangements.

Substrate

Sand or fine-to-medium gravel works well. Jack Dempseys may dig, rearrange substrate, and investigate objects throughout the aquarium.

Decorations

Provide sturdy rocks, caves, driftwood, and other structures that create territories and hiding areas.

Avoid unstable decorations that can fall when the fish digs.

Filtration

Use an oversized canister filter or another high-capacity filtration system capable of handling substantial biological waste.

Strong mechanical filtration combined with biological filtration is especially useful for large cichlids.

Water Parameters

A stable environment is more important than chasing a precise number.

Recommended conditions include:

• Temperature: 24–28°C
• pH: approximately 6.5–8.0
• Hardness: soft to moderately hard
• Excellent oxygenation
• Low ammonia
• Zero nitrite
• Controlled nitrate

Regular water changes are essential for maintaining water quality and supporting healthy growth.

Diet and Feeding

Electric Blue Jack Dempseys are omnivorous and should receive a varied, high-quality diet.

A good feeding program can include:

• High-quality cichlid pellets
• Floating or sinking cichlid foods
• Frozen foods
• Earthworms
• Shrimp
• Krill
• Insect-based foods
• Occasional vegetable-based foods

Feed appropriately sized portions rather than allowing uneaten food to accumulate.

A varied diet can support growth, body condition, and colour development.

Temperament and Behaviour

Despite its beautiful appearance, the Electric Blue Jack Dempsey is still a territorial cichlid.

Individual temperament varies, but adults can become aggressive toward tank mates, particularly during breeding or when defending a territory.

They are intelligent fish that often recognize their keeper and actively respond to movement around the aquarium.

Tank Mates

Tank mates should be selected carefully based on aquarium size and individual temperament.

Potential companions may include appropriately sized, robust Central American cichlids and other large fish capable of handling territorial behaviour.

Avoid:

• Tiny community fish
• Slow-moving delicate species
• Fish small enough to be swallowed
• Fin-nipping species
• Extremely aggressive tank mates unless the aquarium is specifically designed for them

Growth and Development

Young Electric Blue Jack Dempseys can look relatively understated compared with mature specimens. As they grow, their metallic blue coloration and characteristic cichlid body shape can become more pronounced.

Growth depends on genetics, diet, water quality, aquarium size, and overall care.

Because Electric Blue Jack Dempseys are selectively bred, coloration and growth can vary between individual fish.

Breeding

Jack Dempseys are substrate-spawning cichlids. Mature pairs may select a flat rock, cave entrance, or another suitable surface for spawning.

During breeding, territorial behaviour can increase significantly. A dedicated breeding aquarium or very large territory-rich setup may be necessary to prevent conflicts with other fish.

Parents may guard eggs and fry.

Electric Blue Jack Dempsey for Sale in Canada

Looking to buy an Electric Blue Jack Dempsey in Canada? Monster Aquarium Canada specializes in unusual, colourful, and monster-style freshwater fish for Canadian aquarists.

Whether you’re located in Ontario, Toronto, Alberta, Calgary, British Columbia, Vancouver, Quebec, Montreal, Manitoba, Winnipeg, Saskatchewan, or another Canadian location, always check current livestock availability before ordering.

Fish sizes, stock, colour intensity, and availability can change. Shipping and livestock availability are subject to current Canadian inventory and applicable shipping conditions.

5 Frequently Asked Questions

1. How big does an Electric Blue Jack Dempsey get?

Adult size varies, but Jack Dempseys can reach approximately 8–10 inches under suitable conditions. Aquarium size, genetics, diet, and care influence growth.

2. What size tank does an Electric Blue Jack Dempsey need?

A 75-gallon aquarium or larger is recommended for an adult specimen, with additional space required for pairs or multiple large cichlids.

3. Are Electric Blue Jack Dempseys aggressive?

They can be territorial and aggressive, particularly as adults and during breeding. Careful tank-mate selection and adequate aquarium space are important.

4. What do Electric Blue Jack Dempseys eat?

They thrive on a varied omnivorous diet including quality cichlid pellets, frozen foods, shrimp, krill, worms, and other appropriately sized foods.

5. Is the Electric Blue Jack Dempsey a different species?

The Electric Blue Jack Dempsey is generally considered a selectively bred colour form of the Jack Dempsey. Modern taxonomy places the species as Rocio octofasciata, while Cichlasoma octofasciatum remains common in aquarium-trade listings.