Dwarf corydoras

Aquarium fish: Dwarf corydoras (Corydoras hastatus)
Size: 2.4 cm
Origin: South America
Water temperature: 20-28 ° C
Aquarium volume: 30 l

Dwarf corydoras (Corydoras hastatus ) -spotted cuneiform (Corydoras hastatus) – one of the smallest representatives of the cuirassid family.


South America . They inhabit smaller, overgrown waters flowing in the Amazon basin in Brazil and in the Paraguay River basin.

Characteristics and disposition

A mature female reaches a length of 3 cm, a male is 2.5 cm long. Dwarf cuiras are characterized by a dark, more or less curved, sickle-shaped spot at the base of the tail.

The sex of the fish is difficult to distinguish . Females usually more rounded and larger than males (differences more visible when viewed from above). A very calm species, gregarious, sticking well to the shoal. The recommended minimum for an aquarium is 4-6 pieces, preferably 10 or more. In the group, they are bolder, look more effective and show more interesting behavior.

Interestingly , unlike other cuirasses, they are more eager to swim in the middle parts of the aquarium and can eat food floating in the depths. Both their appearance and behavior sometimes resemble tetras.

Nutrition and feeding

They can be fed dry, live or frozen ground food.


Aquarium of at least 30 liters with densely planted plants, equipped with a good filter, because the fish are sensitive to high concentrations of nitrates. Kiryskom should be provided with a soft ground.

Sand, which they eagerly sift in search of food, works best. Lighting should not be too strong. For example, floating plants will help to shade the zones. It can only be kept with small, peaceful fish. It can be eaten by large fish such as Scalar .

The ideal company will be dwarf shrimps, e.g. red cherry or small razbory .


The spawning aquarium should have about 20 l, a sandy substrate, a small sponge filter and small-leaved plants, e.g. java moss. Suitable water temperature is 25-28 ° C, ph – 6.5.

We filter the water through peat. There should be 2 males for each female. Before the planned spawning, Kiryski is fed with a variety of live and frozen food. When the females are clearly fuller, we make a large water change (50% -70%) – cooler by approx. 1-2 ° C.

We increase the flow of water and oxygenate it strongly. We repeat the procedure for several days until the spawn appears. It should be taken into account that many species of fish only breed seasonally, so if we fail to breed them in summer, wait until winter and try again. Certain species reach sexual maturity after a few years. The time of water changes, its oxygenation, etc.

may also be decisive. Patience is recommended. If you do not succeed immediately, it is worth trying another way. During the spawning period, Dwarf Kiryski are more active. Males chase after females until it comes to the act.

The female collects sperm from the male, with which she fertilizes the eggs. Then he looks for a convenient place in the aquarium to put it. Dwarf cuiras often stick their roe in places with strong water current. After spawning is complete, the adults should be separated. It is a good idea to add a few drops of methylene blue to the spawn tank as this will partially prevent the spawn from molding.

For this purpose, you can also put in a few alder cones and some growers even use some species of shrimp that only eat this rotten roe, e.g. the popular red cherry shrimp. Hatching takes 3-5 days. We feed the fry with micro-foods until they are large enough to accept the artemia larvae. It has been observed that young cuiras are less prone to infection when using a sandy substrate.


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