Aquarium fish: Metynnis hypsauchen (Metynnis hypsauchen)
Size: 15 cm
Origin: South America
Water temperature: 24-28 ° C
Aquarium volume: 265 l
Metynnis hypsauchen (Metynnis hypsauchen ) – aquarium fish of the tetrapot family ( Serrasalmidae ). Also locally caught for consumption.
South America. The species is widespread in the areas of Guyana, Brazil, Peru and Bolivia. Its occurrence was recorded in the basins of the Amazon and Paraguay (Rio Paraguai), as well as in some northern rivers, the so-called Guyana Shield.
It lives in densely covered smaller tributaries of rivers.
Characteristics and disposition
The platypus is quite a large fish, it can be up to 15 cm in length in an aquarium. Silvery body, tall, oval, strongly laterally flattened. It resembles silver discs, hence the common name of the species – Silver dollar , which applies to both M. hypsauchen and M.
argenteus. Both species are almost identical and difficult to distinguish. M. argenteus are usually uniformly silver, while M. hypsauchen reportedly have a black spot above and behind each eye.
However, we have not found confirmation of this information. There is also no compromise on which species is commercially available. The male’s anal fin is slightly elongated and slightly red in the front part. A tough, mild-mannered, lively fish, it lives most eagerly in the upper parts of the water. Swims nicely in the shoal.
In the aquarium, it is recommended to keep at least 5 individuals in a group, in a larger group they are less nervous, look nicer and show more interesting behavior. In good conditions, it can live 10 years or more.
Nutrition and feeding
Herbivorous fish. Their diet should mostly consist of plant products such as lettuce, watercress, cucumber, peas, zucchini and dry flakes with spirulina. As a supplement, they can sometimes be given other available live food, e.g.
bloodworm or artemia larvae. It is best to give the food 3 times a day in small amounts so that they will eat everything within 3 minutes.
They require a spacious long aquarium . A 260-liter tank will be suitable for a group of flat squares. In nature, they inhabit rivers with abundant vegetation.
Due to their herbivorous nature, it is difficult to reproduce such conditions in an artificial environment. Even hard, durable plants will need to be replaced from time to time. As a substitute, artificial plants can be used for decoration, which now more and more resemble the real ones. Flat sides are quite nervous fish, so the light should not be too strong , and the shaded areas will give them boldness. Mildly disposed, they can be successfully kept in a social aquarium with other large, gentle fish.
The cast of squares will be nicely complemented by bottom catfish, armors and cuirasses. When choosing roommates, remember that smaller fish that fit into their mouths will sooner or later be eaten.
Breeding moderately difficult . Large spawning aquarium necessary. The water in it should be rather soft (up to 10ºdGH), medium-acidic (6.0-7.0 pH), with a temperature of 26-28ºC.
Changing the slightly warmer water can stimulate the fish to spawn. Males during the spawning period become darker, especially around the anal, caudal and dorsal fins. Redness in the area of the chest area also increases. Males woo females, chasing them all over the aquarium and flexing their fins in front of them. Encouraged female spreads eggs among the plants, which are fertilized by the male.
An adult female lays up to 2,000 eggs during the entire spawning period. The eggs sink to the bottom. Interestingly, parents are rather reluctant to eat them. Anyway, it is better to catch adult individuals after spawning, it will facilitate the rearing of the young. The eggs hatch after about 3 days.
As soon as the larvae have emptied the yolk sac, start feeding them with micro-food in liquid or powder until they are large enough to ingest, for example, Artemia larvae.