Rocio octofasciata


Rocio octofasciata
Jack Dempsey
珍珠豹
The Jack Dempsey (Rocio octofasciata, formerly Nandopsis octofasciatum and Cichlasoma octofasciatum) is a cichlid fish that is widely distributed across North and Central America (from Mexico south to Honduras).Its common name refers to its aggressive nature and strong facial features, likened to that of the famous 1920s boxer Jack Dempsey.
The fish is native to Mexico and Honduras, where it is found in slow-moving waters, such as swampy areas with warm, murky water, weedy, mud- and sand-bottomed canals, drainage ditches, and rivers. It is also established as an introduced species in Australia, the USA and Thailand 
The Jack Dempsey natively lives in a tropical climate and prefers water with a pH of 7-8, a water hardness of 9–20 dGH, and a temperature range of 22–30 °C. It can reach up to 25 cm in length. It is carnivorous, eating worms, crustaceans, insects and other fish. It can eat small/young platies when it is three inches long.

Jack Dempseys lay their eggs on the substrate (the bottom of the aquarium or pool). Like most cichlids, they show substantial parental care: both parents help incubate the eggs and guard the fry when they hatch. Jack Dempseys are known to be attentive parents, pre-chewing food to feed to their offspring. However, it is not uncommon for them to eat their fry when the breeding pair are overly disturbed or something in their environment is wrong.

The coloration changes as the fish matures from a light gray or tan with faint turquoise flecks to a dark purple-gray with very bright, iridescent blue, green, and gold flecks. Their colors change under stress. The dorsal and anal fins of mature males have long, pointed tips. Females lack these exaggerated tips.

The fish is a popular aquarium fish, due to its striking appearance and personable mannerisms. It, like most cichlids, is considered "aggressive", but can get along in a well-populated tank, tending to be more territorial if kept with only a few other fish, therefore allowed to easily establish and defend a "territory" in the tank. Jack Dempsey cichlids can often appear shy, hiding away in cave work. It is recommended that the Jack Dempsey cichlid is provided with plenty of places to hide. They will often claim a cave first and be very aggressive to other tank mates that swim near its home. There is also a blue variant of this fish which commonly known as the blue jack dempsey or electric blue jack dempsey. This is natural genetic mutation. The blue counterpart is less aggressive, smaller in size and more delicate.

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