Archive for the Jack Dempsey category

Jack Dempsey Fish aka Nandopsis Octofasciatum Fish aka

cichlasoma_octofasciata.jpg

Source: From Wikipedia, the free encyclopedia

The Jack Dempsey (Nandopsis octofasciatum) is a cichlid fish named for the 1920s boxer Jack Dempsey. The name alludes to its aggressive nature. Like most cichlids it is territorial, especially against its own kind and similar species. The fish was once very popular due to its striking appearance and personable mannerisms. While it is a popular aquarium fish, due to its behavior it is not easy to keep.

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. The dorsal and anal fins of mature males have long, pointed tips. Females lack these exaggerated tips.

The fish is native to Yucatan and Central America, 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 (presumably as an aquarium escape). The Jack Dempsey natively lives in a tropical climate and prefers water with a 7–0 pH, a water hardness of 9–20 dGH, and a temperature range of 72–86 °F (22–30 °C). It can reach up to 25 cm (10 in) in length. It is carnivorous, eating worms, crustaceans, insects and other fish.

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.

In 1997 the San Francisco Chronicle reported that a man had died when he put a Jack Dempsey into his mouth as a joke: the fish presumably erected its fin spines to avoid being swallowed, a characteristic cichlid anti-predator response, and became wedged in the man’s throat.

Predator Tropical Fish

Predator Tropical Fish

By Nate Jamieson

Some tropical fish, either because of their size, feeding habits, or just their natural behavior, are not suitable for beginners to try and raise in a community tank. These are some of the big and bad, that you may want to avoid until you’re more experienced.

Oscar- This native of the Amazon River and its tributaries, is a large fish, reaching 13-14″ in length, although it can be sexually mature and laying eggs at 4″. They do best in a tank with no “fussy” things like slender plants or ornaments. They prefer a medium texture substrate because they’re great diggers, but do like wood or rock platforms that create a cave. The recommended food for Oscars is feeder goldfish, because they basically will eat anything small, that moves. This is why they can’t be kept with smaller fish, or livebearers that will have young. Most hobbyists use a special large stick food that absorbs some water and moves with the motion in the aquarium, so it mimics prey.

Jack Dempsey- Another South American native, the Jack Dempsey comes in many of the same dark colors and spotting as the Oscar, featuring greens, brown and gray areas, which may help large species like this to hide amongst the bottom rocks. The Dempsey is similar to the Oscar in other ways as well, being a bottom digger, and preferring caves and wood to rest under. They are also a live feeder that will devour anything that moves, but unlike the Dempsey, they pursue their prey, and are considered to have “attitude” that makes them best suited to a tank of like-minded fish.

Discus- While not the bottomless pits that Oscars and Jack Dempseys are for feeding, the Discus is still a large fish, even at 6″, and because of their native Amazon River environment, require a fairly specific habitat. In the wild they lived where trees had fallen into the river, and made their homes under and around the branches. In an aquarium, that means keeping a thick substrate where the light does not reach down to, as well as lots of wood pieces for hiding, and vegetation that goes from bottom to top. They are live feeders as many large fish are, but generally subsist on a diet of shrimp, tubifex and daphnia in good quantity. They are a fish that lives naturally in groups of five or six, and in the home environment, do not take well to upsets or changes in the tank.

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Article Source: http://EzineArticles.com/



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