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آکواریوم - Discus

بازدید : مرتبه
تاریخ : سه شنبه 3 خرداد 1390


Neon Blue

Ocean Green

Pigeon Blood

Red Marlboro

Red Turquoise

Royal Blue

Royal Red

Snakeskin

Snow White

Yellow Marlboro

Name: Symphysodon aequifasciatus/discus
Size Tank pH Temp
Origin: Amazon River Basin
18 cm 200 L 6.5 28°C

 

 

You can gather a lot for a fish species from knowing where it comes from. The discus comes from the Rio Negro and surrounding tributaries and streams in the Amazon Basin. From this we know it likes very soft and acidic waters, with minimum current and warm temperatures. Wow! those are the basics of keeping discus. The discus, despite popular belief, doesn't typically inhabit the same waters as the angelfish. The angelfish is more or less originated around the Amazon River itself and surrounding tributaries, which is a bit farther north. The water the discus comes from looks like a well brewed cup of tea from the large amount of wood and leaves releasing tanins into the water. There is a greater concentration of wood and rock to plant life in the discus habitat, most of the plant life is lillies and other floating types, so the discus feels more at home in subdued lighting.

The Basics:
You can house a single individual or a mated pair in a 75 L tank, but surely you would give such a grand fish a more roomy penthouse than this. In my opinion a discus should not be kept in a tank smaller than 180 liters. This tank can house 4 discus along with some cories and peaceful algae eating fishes. The general rule I have found with discus is that you keep a single fish, a *mated* pair, or in a large group. Why? do you ask, discus are cichlids and when adults will kind of establish a pecking order. Pairs typically are bonded and don't pick on one another very much, a solo fish doesn't have anyone to pick on or vice versa, and in a group no single fish is target for all the picking. Discus are predatory and in the wild they would eat small fishes, bugs, worms, grubs and maybe even dead animals. So the diet for your discus should be meaty, but do add some vegetation, it really perks their coloration. I have found Tetra ColorBits to be good at bringing out colors and my discus relish the small pellets, this is about the only dried food they will have. They really have a preference for frozen foods. A lot of the big breeders keep their discus in nothing more than a water filled glass box. I personally don't like this method and believe for the discus to show its best colors and be healthy it should have some hiding places.

Breeding:
I won't go too far into this subject, because I have only reared a handful of discus in comparison to some of the professional discus breeders. But the pair chooses their spawning site - usually a leaf, pot, slate rock or some other smooth flat surface - and lays their clutch of eggs. They protect and fan these eggs until they hatch in about 2-3 days. The young act much like Angelfish, they will wiggle and squirm about for 5-6 more days. Then they will free swim and feed from the mucus coating on the parent fish. I start supplementing this diet with newly hatched brine shrimp when the fry are about 3-5 days old. This is truely a sight to see, it is touching and amazing to witness a group of around 100 young discus feeding from their massive parents. Doing daily water changes of 20% is good. When the young are about 2 cm, move them out to their own tank and continue feeding the brine shrimp. Start introducing some frozen foods and basically keep that tank clean. They really aren't hard to keep if all precautions to keep water in its prime is taken.

Conclusion:
Whether you are and avid discus addict or just looking into these beauties, there's certainly one thing most of us agree on: there is no fish quite like the discus. There is no site so grand as to see a tastefully planted tank with several
of these peaceful cichlids floating about in the midst of the plants.

 

Discus (Symphysodon spp.) are a genus of three species of cichlid freshwater fishes native to the Amazon River basin.[1] Discus are popular as aquarium fish and their aquaculture in several countries in Asia is a major industry

Taxonomy

Discus belong to the genus Symphysodon, which currently includes three species: The common discus (Symphysodon aequifasciatus), the Heckel discus (Symphysodon discus), and a new species which has been named Symphysodon tarzoo.[6] However, a further investigation published in August 2007 [7] suggested that the genus held the three species: S. aequifasciatus (the green discus), S. haraldi (the blue/brown/common discus) and S. discus (the Heckel discus). Both studies suggest three species; the only disagreement is in the scientific names for each.

Appearance

Red turquoise discus

Like cichlids from the genus Pterophyllum, all Symphysodon species have a laterally compressed body shape. In contrast to Pterophyllum, however, extended finnage is absent giving Symphysodon a more rounded shape. It is this body shape from which their common name, "discus", is derived. The sides of the fish are frequently patterned in shades of green, red, brown, and blue. The height and length of the grown fish are both about 20–25 cm (8–10 in).[citation needed]

Reproduction and sexual dimorphism

Discus with two of its young nearby

Another characteristic of Symphysodon species is their care for the larvae. As for most cichlids, brood care is highly developed with both the parents caring for the young. Additionally, adult discus produce a secretion through their skin, which the larvae live off during their first few days. This behaviour has also been observed for Uaru species. However when bred in captivity the larvae will tend to live off their parents secretion for up to 2 weeks.[8]

 Distribution

The three species of Symphysodon have different geographic distributions. S. aequifasciatus occurs in the Rio Solimões, Rio Amazonas and the Río Putumayo-Içá in Brazil, Colombia and Peru. In contrast the distribution of S. discus appears to be limited to the lower reaches of the Abacaxis, Rio Negro and Trombetas rivers. S. tarzoo occurs upstream of Manaus in the western Amazon 




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