Threestripe corydoras

Aquarium fish: Threestripe corydoras (Corydoras trilineatus)
Size: 5.5 cm
Origin: South America
Water temperature: 22-26 ° C
Aquarium volume: 40 l

Threestripe corydoras (Corydoras trilineatus ) – interestingly colored, small aquarium fish from the cuirassid family.

Occurrence

South America. A widespread species. It is found in the Amazon basin of Colombia, Peru and Brazil, and in many Surinama river systems. It lives in small canals, watercourses, swimming pools and flooded forest areas.

Characteristics and disposition

Reaches up to 5.5 cm. A straw-colored body, slightly brown at the top. Underbelly white or pale gray. Gill covers with a greenish sheen. The mottled pattern on the body varies, the points are arranged in lines that form three visible stripes running along the side line – hence its common name Three lined Cory.

The pattern on the head resembles a mesh. A caudal fin with five horizontal stripes, an anal fin a spotted one, a dorsal fin usually with a larger black spot, but there are also individuals without it. Almost always confused with Julia’s Corydoras ( Julia’s Corydoras ) and sold under the wrong name in most cases. C. Julia is a very rare species, almost unavailable for trade.

Contrary to the Kirysk three-stripe, it has tiny dots all over its body, the dark stripe on the lateral line is paler and does not extend that far towards the head. Nevertheless, it can be difficult to distinguish between the two species without knowing the origin. Females are clearly larger, wider and rounder – it is especially visible when viewed from above. Males are smaller, more slender. Adult male fin tips are generally sharper.

Kiryski trumpets are calm, shoal fish. In their natural environment, they swim in large shoals. It is recommended to keep min. 6 pcs , preferably more. In large numbers, they will be much bolder and more active.

Kiryski do not have scales. Their bodies are protected by bone plates arranged in two rows. An additional deterrent function is played by the first rays of the pectoral and dorsal fins. They are very sharp and can easily become entangled in the net or prick painfully. Therefore, care should be taken when caring for cuiras.

They are adapted to survive in oxygen-poor waters. They have a modified intestine that functions as an additional respiratory organ and therefore they can draw the atmospheric air from the water. In an aquarium, they often swim rapidly to the surface to get air. This behavior is completely natural.

Nutrition and feeding

Omnivorous.

In the aquarium, you can give good-quality dry food that sinks to the bottom, regularly supplementing it with live and frozen food, e.g. with daphnia, artemia, bloodworm, and hydration.

Aquarium

A small herd of cuiras can be kept in a 45-liter tank, necessarily with a soft base, so that they do not hurt their delicate mustaches and tummy. They will feel best in a reservoir designed like an Amazon biotope. For this purpose, you will need fine river sand, dry roots, twisted twigs and leaves of e.g.

beech, oak, ketapang. These natural decorations will gradually release very desirable tannins into the water and color the water the color of weak tea. Additionally, the water can also be filtered through peat. The light shouldn’t be too bright. Plants in natural habitats are absent.

Sensitive to contamination – require regular replacement and cleaning of the substrate. First of all, their whiskers are exposed to infection through frequent contact with decaying, rotting debris (the habitat of bacteria). A calm and peaceful species. It can be combined with small tetras, carp, labyrinths, and mild catfish, e.g. tetras, razbors, danios, gourami, small cichlids.

It will not be a suitable companion for much larger and aggressive species. They will eat the roe and fry of their fellow residents.

Breeding

The reproduction is similar to that of other cuiras. The spawning aquarium should have min. 45 cm long.

Sand may be used as the substrate, but is not necessary. A small sponge filter is enough for filtration. The optimal parameters of water for reproduction are 6.5 pH and a temperature of 23-24 ° C. Filtering the water through peat or using demineralized water may help. 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, the fish should be fed more abundantly with live or frozen food. When females are noticeably thicker (full of eggs), a large change of cooler water should be made (approx. 50%), aeration and circulation should be increased.

We repeat this process every day until spawning. It must be remembered 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 methods, e.g.

replacements at a different time of the day, greater oxygenation, etc. Courtship begins with males. They chase the female along the entire length of the aquarium. After a few days, the roles reverse and shortly afterwards spawn in the T-position 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 pcs.) Into the previously created basket from her pelvic fins, and then it flows away and lays them in a selected place, e.g.

on the aquarium glass, on a flat stone or among small-leaved plants. The situation repeats several times and usually lasts 2-3 hours. During the entire cycle, an adult female lays about 100-150 eggs. After spawning, adult cuiras should be separated or the eggs should be transferred to a separate aquarium. Eggs mold easily.

You have to closely observe and remove every broken grain. You can also prevent this by adding a few drops of methyl blue to the water. Hatching, depending on the temperature, takes 3-5 days. Initially, the larvae feed from their yolk sac. After this time, the smallest food can be fed, 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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