A stocky, jewel-spangled Central American cichlid named after the heavyweight boxer for its pugnacious nature. Mature adults are stunning — dark bodies studded with iridescent blue-green flecks — but their size and aggression demand a dedicated keeper.
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Males reach about 8-10 in (20-25 cm); females smaller, around 6 in (15 cm).
Lifespan
8–15 years
Social needs
pair
Native region
Central America (Atlantic slope from southern Mexico through Honduras), widely introduced elsewhere
Origin
New World
Climate
🌴 Tropical
Water type
💧 Freshwater
Family
Cichlidae
Genus
Rocio
Part of the Cichlids
Cichlids are a large, behaviorally complex family of freshwater fish prized for color, intelligence, and elaborate parental care. They range from peaceful dwarfs to highly territorial Rift Lake and Central American species, and most demand stable water chemistry and thoughtful tankmate selection.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Pair tank
75 gal / 284 L long
Rocio octofasciata reaches 8–10 in and is aggressive. 75-gal long minimum for a bonded pair, with sand, rockwork caves, smooth driftwood, and strong filtration. Pairs only or single specimen.
Recommended
Display pair tank
125 gal / 473 L long
125-gal long for a pair with tough peaceful tankmates (large catfish), sand, rockwork, and strong filtration. Stunning electric-blue iridescent colour in well-fed adults.
Chabe01 / CC BY-SA 4.0 (Wikimedia Commons)
Ideal
Central American biotope
180 gal+ / 681 L+ biotope
Central American biotope with sand, driftwood, rockwork, and a pair plus compatible large tankmates. Excellent parental behaviour and full colour development.
Patrick Ch. Apfeld / CC BY-SA 3.0 (Wikimedia Commons)
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg
Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.
Photo coming soon
Fry
Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.
Photo coming soon
Juvenile
Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.
Adult
Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
House a single fish in at least 55 gallons (about 200 L); a pair or any tankmates need 75 gallons (285 L) or more with a long footprint. Keep temperatures at 72-82°F (22-28°C), pH 6.5-8.0, and soft to moderately hard water; they tolerate a wide range but dislike sudden swings.
Aquascape with sturdy rockwork, driftwood, and caves to create territories and refuges. Moderate flow and subdued lighting suit them; darker substrate and backgrounds bring out their iridescent spangling.
Substrate
Fine sand or smooth gravel works well and supports their digging behavior. A darker substrate intensifies the contrast of their blue spangling; secure rockwork directly on the glass beneath the substrate so excavation can't undermine it.
Equipment & setup
Use an oversized canister or large hang-on-back filter to cope with their messy, high-protein diet, plus a guarded heater they can't crack against. Standard lighting is sufficient. Strong, well-maintained filtration and weekly water changes are the key to long-term health.
Diet
Jack Dempseys are carnivorous opportunists. Base the diet on high-quality cichlid pellets, supplemented with frozen or live foods such as bloodworms, earthworms, shrimp, and the occasional gut-loaded feeder substitute. Avoid feeder fish, which carry disease and offer poor nutrition.
Feed adults once daily, juveniles two or three times; include occasional vegetable matter for balance. Do not overfeed, as they are prone to obesity and bloat.
Behavior & temperament
Territorial and aggressive, particularly when breeding or in cramped quarters, though temperament varies between individuals. Best kept singly, as a bonded pair, or with similarly robust cichlids and large catfish in a spacious tank with broken sightlines. Not reef-safe context aside, they are unsuitable for small or peaceful community fish, which they will bully or eat.
They are intelligent, learn to recognize their keeper, and become bold once settled. Pairs are diligent substrate-spawners and parents.
Health
Hardy if water is kept clean, but sensitive to nitrate accumulation and prone to hole-in-the-head (HLLE) under poor conditions or carbon stress. Watch for ich, bloat from overfeeding, and aggression-related injuries. Stable warmth and large regular water changes prevent most issues.
Tips, DIY & hacks
Buy young and grow them out to watch the spangling develop over months. To pair them, raise a small group and let a bond form, then remove the rest. The popular 'Electric Blue' Jack Dempsey is more delicate and slower-growing than the wild form — give it extra-stable water.
