Arovanians belong to the family Osteoglossidae and their closest relatives are arapayma (piraruku) – one of the largest freshwater fish. However, the arovans themselves are not tiny, the Asian forms grow up to a meter in length with a weight of 20 kilograms.
South American Arovana is totaling more: body length is about 120 – 140 centimeters.
Arovanized are considered living minerals, such as coelacanths. Scientists of paleontologists succeeded in finding fish from the time of the Jurassic period, which were one in one similar to modern arwan. In South America dwells black and real arovan.
Their homelands are the basins of the Guyana, Orinoco and Amazon rivers. The real Arovana is widespread in South America and is widely found in its habitat.
The Asian form of arovanate is found in the waters of Cambodia, Burma, Vietnam, South China and Thailand. The Asian species of arovan has several subspecies that differ in color.
Due to increasing human economic activity, large size and tasty meat, the Asian Arwan population has declined sharply, and the species itself was taken under protection.
Fortunately, the authorities of the above countries have rushed in time, and now the majority of these interesting fish live in pond farms, where fish inspectors almost count each producers as well as their offspring. In Singapore, according to the laws, any exported fish must have accompanying certificates, and if the fish farmer is going to export fry, then the main part of the offspring must be released into natural conditions.
If inspectors found a high mortality rate and weak fry withdrawal in the retarder, then the owner may lose the license.
The variety of Asian arovan differing in color is great. If you rummage in foreign catalogs, you can count several dozen, or even hundreds of varieties. Gold and red arovan are considered the most valuable.
However, their cost is very high, respectively, cheaper options with a modest color are supplied to our country.
There are also Australian arovans. The species Scleropages jardini is found in northern Australia and New Guinea, and the species Scleropages leichardti is found only in a few small reservoirs of Queensland.
Australian Arwan was not imported to the territory of the post-Soviet space.
All types of Arwan live in approximately the same conditions. Fish prefers a wide expanse of water, not a strong current. If there is a strong current in the river, the arovan will search for a backwater or a gulf where the current is weaker, or its not at all.
The fish has a net upper mouth, a long straight back. The dorsal fin is carried far back, which indicates that the arvana prefers the surface layers of water bodies.
When you turn your head against the current, the fish has to make zigzag movements to the sides. Two whiskers on the lower jaw will detect any fluctuations in the water and signal to the arovana a insect that has fallen into the water, or floating animals.
Thanks to their exceptional vision, magnificent hunters are arovanized.
When the prey is noticed, the fish jumps out of the water with a powerful jerk and opens its huge mouth wide. Very often, arrovan in nature feed on insects, small birds, reptiles and small mammals flying above the surface of a pond.
The approximate ration of ryvans from South America consists of the following delicacies: about 40% are flying insects and spiders, 50% are small crustaceans and aquatic insects, and 10% are small fish.
Unfortunately, fish are clearly devoid of sexual dimorphism. Accordingly, it is possible to distinguish a male from a female either as a result of an autopsy, or by behavior during spawning. According to eyewitnesses, rapid spawning occurs in the surface layer of water.
At the end of the spawning season, the female throws out a couple of dozen large eggs. If we consider the size of the eggs from the aquarium point of view, then their sizes are very large: 10 – 20 millimeters.
After fertilization of eggs, the male collects them all in his mouth and ikubiruet it there for 2 – 3 weeks. At this time, the male does not eat anything.
The newly hatched larvae are of decent size – up to 6 centimeters. Until the yolk sac resolves, the fry will be under the care of the male in his mouth. In general, the incubation period of the eggs and larvae in the mouth of the male takes from one and a half to two months.
However, Asian suppliers take fertilized larvae with the still unresolved yolk sac from the maw’s mouth and send it to all corners of the globe.
There is a certain sense in this manipulation, because the yolk sac has not yet resolved, the fry does not need to be fed. The only problem with the normal delivery of such fish is that after resorption of the yolk sac the fish will require a large amount of feed.
And if transportation is delayed in time, then the entire population of fry can be killed and never reach the destination.
As I have already said, Arovan can not be called cheap fish: one fry can cost as much as a couple of dollars when buying in bulk, and an adult can even drag out a few hundred dollars. If you believe the American aquarists, professionals, then Arovana is by far the most expensive aquarium fish.
The total cost of sales of this fish and its average price confidently overtook the discus and sea inhabitants.
The maintenance of arovan in an aquarium is not a difficult process, the main thing is to know the main key points that must be followed strictly. The volume of the aquarium – the more the better (optimal length of 120 centimeters).
Since fish grow very quickly, they grow easily up to 50 centimeters in length. This is certainly not like in nature, but a half-meter monster in a home glass jar is also not bad. The depth of the aquarium does not play a key role, it will be enough to have a 40 centimeter can, because it is seldom lowered to the bottom.
On top of the aquarium should be installed cover, because the fish can jump out of it and die.
Hydrochemical composition of water does not play any role. They are perfectly adapted to water with different hardness and pH values. In natural habitats, water is arovan soft or medium hard with slightly alkaline active reaction.
They are not sensitive to excess nitrates in an aquarium, although even the most meager concentration of nitrites or ammonium can be fatal for fish. Accordingly, it is better to install a biofilter in the aquarium and regularly make changes. It has been repeatedly noted that the artovans calmly endure a 50 percent water change.
In general, the optimal amount of substitute water is about 30%.
A key aspect in the maintenance of arvan is proper and balanced feeding of pets. It is especially important to organize the right diet for the young.
As I said earlier, the main part of the Arwan menu is small crustaceans and insects. Similarly, should be in the aquarium. You can use marble cockroaches and crickets as your home dressing.
According to the majority of experienced aquarists who have succeeded in keeping and breeding Arwan, one of the best food is frozen or live gammarus. In addition, they are not opposed to eat small frogs, tadpoles and small fish.
Some may think, why bother, and start feeding their dear pets with frogs and weed fish from our domestic reservoirs. This approach is fundamentally wrong, because it entails the formation of liver disease and obesity.
Kohl you got yourself an exotic pet, please provide him with proper and varied nutrition. If I say diverse, then the menu should include the following feed: bloodworm, koretra, meat of red fish, seafood (meat of shrimp or squid), and what I wrote above.
Arovan can be easily taught to artificial feeds, with the exception of flocculent. The main condition – to feed floated, or slowly sinking.
Fish will be happy to pick up food in the water column, and when the remnants of undernourished food sink to the bottom, Arovana will leave it unattended and he will quietly rot on the ground.
Sick are extremely rare. The most common disease that occurs in modern practice is an unhealthy diet that involves liver disease. It is also quite often that a bacterial infection can occur, which provokes the initial glazing of eyes.
It will help cope drug AquaFuran or its equivalent. Far less often, fish suffer from fungal diseases: a white patina is formed on the skin, as in saprolegnosis, and mustaches on the lower jaw can also die off.
In this case, the drug Sera Mycopur has proven itself well.