Corydoras julii

Aquarium fish: Corydoras julii (Corydoras julii)
Size: 5.2 cm
Origin: South America
Water temperature: 23-26 ° C
Aquarium volume: 40 l

Corydoras julii (Corydoras julii ) – a small species of aquarium fish from the cuirassid family.


South America. The species is found in the lower part of the Amazon basin in northeastern Brazil in the states of Para, Maranhao, Piaui and Amapa. Reported in the river systems of Guama, Maracana, Morcego, Parnaiba, Piria, Caete, Turiacu and Mearim. It lives in small canals, watercourses, swimming pools and forest lagoons.

Characteristics and disposition

Reaches up to 5.2 cm. Light yellow body – straw-colored or cream-colored, turns brown at the top. Underbelly white or pale gray. On the body, there are numerous small spots, which may also slightly connect with each other with time, but not like in the case of Corydoras trilineatus , where the spots form clear lines. Also, the black band on the side of the body is paler and does not extend that far towards the head.

Julia cuirass is much less common in trade, in most cases cuirass sold in stores under the name Julia turn out to be triple cuirass.It can be difficult to distinguish between the two species (especially the young ones) without knowing their origin. Caudal and anal fins speckled. Black spot on top of caudal fin. Females are usually stockier, wider – this is best seen when looking at the fish from above. Males are smaller and more slender, in adults the tips of the fins are sharper.

Kiryski julii are calm, shoal fish. In nature, they swim in large groups and comb the sandy ground together. In home conditions, it is recommended to keep min. 6 individuals, preferably 10 or more . More of them are braver, more active and show more natural behavior.

Like other cuiras, they do not have scales, and their body is covered with two rows of bone plates. The first rays of the pectoral and dorsal fins are hard and sharp – be careful when catching as they can easily become entangled in the net or prick painfully. They have an additional respiratory organ – a modified intestine, thanks to which they can take air from above the water surface. In an aquarium, they often swim rapidly to the surface to draw air, which is perfectly normal and natural behavior.

Nutrition and feeding


In nature, they feed on small worms, crustaceans, insects and plant matter. In the aquarium, they are not capricious and eagerly eat dry, frozen or live food. Every day, they can be given good-quality dry food falling to the bottom, supplemented with vegetable, frozen or live food, e.g. daphnia, hydration, grindal, tubifex.


A 45-liter aquarium is enough for a small group of Juli’s cuirassiers.

They will feel best in the reservoir of the Amazon biotope. It is best to use soft sand as the substrate , on which the fish will not injure their delicate mustache and belly, and they will also be eager to sieve it when searching for food. Dry roots, twisted twigs and leaves of e.g. beech, oak, ketapang will be suitable for decoration, they will give the water the desired tannins and color the water the color of weak tea. The water can additionally be filtered through peat.

The light should not be too bright. Plants in natural habitats are absent. They are fish sensitive to water pollution – they require regular changes and cleaning of the substrate. Their whiskers are exposed to infection through frequent contact with decaying, rotting debris (a habitat for bacteria). A peaceful species.

It can be combined with small carp, tetras, labyrinths, labyrinths and mild catfish, e.g. with tetras, razors, danios, gouras. It won’t be good company for much larger and aggressive species. They will also eat the roe and fry of their fellow residents.


The reproduction is similar to that of other cuiras.

The spawning tank should have min. 45 cm long. You can sprinkle sand on the bottom, but it is not necessary. A small sponge filter is sufficient for filtration. The optimal parameters of the water for reproduction are pH 6.5 and the temperature is approx.

23-24 ° C. In order to reduce the pH, we can filter the water through peat or dilute it with demineralized water. Place clumps of small-leaved plants in the tank, e.g. moss or artificial aquarium mops. There should be 2-3 males for each female.

Before the planned spawning, fish are fed more often with live or frozen food . When females are clearly thicker (full of eggs), a large change (approx. 50%) of cooler water should be made and aeration and circulation should be increased. We repeat this process every day until spawning occurs. It should be noted here that many species of fish breed seasonally.

If Kiryski won’t wipe out in summer, let’s try in winter. Moreover , patience is recommended as some species reach sexual maturity late. It is worth trying different approaches, i.e. changing at different times of the day, increasing aeration, temperature changes, etc. The males start courtship, chase the female along the entire length of the aquarium.

After a few days, the roles are changed, and shortly after that, the T-position is typical for cuiras – the male at an angle of 90 ° to the female covers her head with his pectoral fins and releases the milk into her mouth. The female releases the already fertilized eggs (2-4) into a basket made of pelvic fins, and then it flows away and lays them in a selected place, e.g. on a flat stone, aquarium glass or among small-leaved plants. The situation repeats itself many times and lasts about 2-3 hours. During the entire cycle, the adult female is able to lay about 100-150 eggs.

After spawning, adults should be caught or moved to a separate aquarium. Eggs go moldy easily , so you need to watch carefully and remove any spoiled grains. You can also add a few drops of methyl blue to the water. Hatching, depending on the temperature, takes 3-5 days. Initially, the larvae consume food from their yolk sac.

After this period, you can start feeding the smallest foods, e.g. brine shrimp larvae, micro nematodes. The fry require clean, oxygenated water to develop properly and appear less prone to disease when buried in a thin layer of sand .


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