Corridors (Corydoras) – kind of aquarium catfish.
Family: Calligthy catfishes (Callichthyidae).
Inhabit Central America, the northern and central parts of South America. They usually stay in silted, slowly flowing and stagnant waters.
The body is stocky, slightly elongated, with a high anterior part, the profile of the belly is almost straight, the sides are somewhat flattened and covered with 2 rows of bony plates. On the upper and lower jaws on a pair of antennae. The tail fin is two-bladed.
Pectoral fin with a powerful spiny ray. Thoracic and ventral fin well developed.
There is a fat fin.
In the male, the upper end of the dorsal fin is pointed, in the female it is rounded. In the female ready for spawning, the profile of the belly is arched.
Fish have extra intestinal respiration, so you need to provide access to the surface of the water for air entrapment.
They like shelters, but they also willingly lie on stones and snags. Dig in the ground in search of food.
A group of fish can be kept in the general aquarium, sometimes thickets, stones and snags.
Food: live, substitutes. Take from the ground.
It is preferable to spawn a group of fish at the age of 1.5 years (4-6 males and 2-3 females or 2-3 males and 1 female) for spawning,
which before this week are kept separate. Spawning both in general and in a spawning aquarium with a length of 70 cm, arranged as a common one.
Frequent additions of fresh water stimulate spawning.
Females begin to swim restlessly, pursued by males. Then one of them becomes sideways in front of the head of the female and emits sperm, while the female at this time lays several eggs into the folded bucket of the ventral fin and swims through a cloud of sperm.
In some species, the female then cleans the leaf of the plant, the glass of the aquarium or any hard object and sticks the eggs to it, pressing and opening the ventral fin; in other species, having opened the ventral fin, it swims among small-leaved plants (most often aquarists use Javanese moss as a substrate), leaving sticky eggs on them. This process is repeated several times and can last from several hours to 3 days, depending on the type of fish.
At this time, fish are recommended to be fed with an enkhitreus or a pipe builder, so that they are not hungry, as the female often eats eggs.
After spawning, fish are removed or the substrate with caviar is transferred to the incubator (if the eggs are laid on the glass of the aquarium, then they are carefully removed with a razor).
The incubation period depends on the temperature and type of fish and is 3-12 days, the fry swim in 1-4 days.
Starter feed: live dust.
Corydoras barbatus (Quoy, Gaimard, 1840).
The reservoirs of Brazil inhabit between the city of Rio de Janeiro and the city of San Paulo.
Length up to 12 cm, in the aquarium usually up to 7 cm.
The body is shiny, yellow-brown, golden-yellow to the belly. Head and side covered with dots and curls from blackish
to brownish yellow.
The upper part of the tail stem is golden yellow. Dorsal, anal and caudal fin with brown specks.
At the male, the edges of the head are covered with short bristles, the first ray of the pectoral fin is very long, white in front, black behind.
Before spawning, the female darkens the coloring of the head, and a checkered drawing of a chessboard appears on the back half of her body.
Fishes in the twilight begin to float briskly in flocks around the aquarium.
Water: 24-28 ° C, dH 5-25 °, pH 6.5-7.5. Spawning at the ground.
The female glues the eggs to the glass of the aquarium in its upper third to 60 eggs in clusters of 3-4 pieces. Fish spawn sucked, but do not eat.
The incubation period is 4 days at 24 C, the fry swim after 3 days.
Corydoras panda Pfffssen, Isbriicker, 1971.
Length up to 5.5 cm.
The body is rich brown-orange in color, a black transverse wide band passes through the eye, and a large black spot on the caudal stem. The dorsal fin is black with a transparent upper edge.
The remaining fins are yellowish.
The female is taller, fuller and larger than the male.
Water: 22-26 ° C, dH 5-20 °, pH 6.5-7.5.
At elevated atmospheric pressure do not spawn. The female lays eggs up to 70 pieces on the glass of the aquarium near the water surface, on the lower side of the leaves, on the ground or tossing, floating among small-leaved plants, but always on the most illuminated places.
Puberty at 8-10 months.
Catfish sparrow. Somik dwarf.
Corydoras hastatus Eigenmann, Eigenmann, 1888.
Inhabit the basin of the middle stream. Amazon and upper river. Paraguay.
Length up to 3 cm.
The body is from pale green to golden yellow in color, along it is a black stripe, which at the base of the caudal fin passes into a rhomboid spot, above and below the stripe there is a yellowish border. The upper edge of the fatty fin is black, the other fins are colorless.
The female is fuller than the male.
Fish love clean water and keep a flock in the middle layers of water.
Water: 22-26 ° C, dH 5-20, pH 6.5-7.5.
Spawning aquarium with fresh water 24-26 ° C, dH 5-10 °, pH 6.5-7.2, with Javanese moss and aeration. The female lays eggs among plants or attaches to the glass of the aquarium up to 80 pcs. The incubation period is 4-8 days, the fry swim
in 1-3 days. Puberty at 7-10 months.
Corydoras aeneus (Gill 1858).
Inhabit the small rivers and streams of tributaries of the Amazon River.
Length up to 7 cm.
The body is yellowish-brown in color with a wide green longitudinal stripe on its side, which continues on the middle rays of the lower lobe of the caudal fin. Fins are yellowish, transparent.
The male is slimmer and smaller than the female.
Water: 18-24 ° C, dH 5-25 °, pH 6.5-7.5.
In a spawning aquarium, water is 18–22 ° C, lower by 2–3 ° C than at a content dH of 5–12 °. The female lays caviar (up to 300 pcs.) On leaves and hard objects. The incubation period is 3-6 days, the fry swim the next day.
Puberty at 8-12 months.
Corydoras cochui Myers, Weitzman, 1954.
Inhabit water bodies of the middle stream. Amazon.
Length up to 3 cm.
The body is yellow-brown, the side with a silvery sheen, the belly is white. Along the body there is a black discontinuous band, ending in a spot on the tail stem.
Tail fin with small dark points in the form of transverse stripes.
The female is larger and fuller than the male.
Water: 22–26 ° C, dH 5–25 °, pH 6.5–7.5.
Spawning is stimulated by fresh water and lowering the temperature by 3-4 ° C. The female lays eggs up to 50 pcs on hard objects and small-leaved plants.
The incubation period is 4 days.
Catfish speckled. Somik ordinary.
Corydoras paleatus (Jenyns, 1842).
Inhabit the southeastern part of Brazil.
Length up to 7 cm.
The body varies from olive brown to olive green, on the back and side of various sizes blackish spots and small specks. The fins are gray with black specks and strokes.
The male is smaller and slimmer than the female.
There is a red-eyed albino form with a pink coloration of the body.
Water: 18-24 ° C, dH 5-25 °, pH 6-8.
In a spawning tank, water dH is desirable at 5-15 °, pH 6-7.4. The female lays eggs up to 200 pieces on leaves and hard objects. The incubation period is 5-14 days, the fry swim in 1-2 days.
Puberty 6-8 months.
Corydoras trilineatus (JULII) Cope, 1871.
The literature is often described under the name C. jullii.
Length up to 5 cm.
The body is silver gray. On the head and back are numerous small black specks and zigzag lines. From the gill cover to the base of the caudal fin there is an uneven black stripe, with short transverse lines at the top and bottom of it.
In the area of the belly black dots. In the upper part of the dorsal fin large black spot.
On the tail 5-6 transverse black lines formed by small dots.
Fish are shy, they are kept in groups of at least 6 specimens in water at 23-27 ° C, dH 5-15 °, pH 6.5-7.5.
The female lays eggs up to 60 pcs on leaves and hard objects. The incubation period is 4-6 days, the fry swim after 3 days.
Puberty at 12 months.
Corydoras metae Eigenmann, 1914.
Inhabit p. Meta (Colombia).
Length up to 5 cm.
The body is a gentle yellow-brown color. Starting from the dorsal fin, a narrow black-and-blue stripe runs along the back, which, ending, covers the tail stem at the base of the tail. Another black and blue stripe passes on the head through the eyes.
The fins are soft brown and transparent; the dorsal fin can be completely black-blue.
The female has dark bands.
Water: 24-27 ° C, dH 5-15 °, pH 6.5-7.5.
Stimulate the spawning change of 1/4 of water fresh, lowering the temperature to 21-22 ° C and pH 7 and below. The female lays eggs up to 100 pieces on large leaves, and in their absence on hard objects, as well as in the bush of Javanese moss.
The incubation period is 2-7 days, the fry swim in 2-3 days.
Corydoras nattereri Steindachner, 1877.
Inhabit p. Paramba and Rio Dosi (eastern Brazil).
Length up to 6.5 cm.
The back and forehead of a light olive-brown color, the side of a gentle silvery-green, belly whitish. On the side there is a longitudinal dark stripe with a greenish tint; under the anterior part of the dorsal fin there is a black-brown spot.
The fins are transparent, yellowish.
The male is smaller, during the spawning period it is colored much brighter than the female.
Water: 22-24 ° C, dH 5-20 °, pH 6.5-7.5.
Spawning in a stream of clean water 23-25 ° C, dH 5-10 °, pH 6.5-7. The female lays eggs (up to 30 pcs.) On plants and hard objects.
Fish eggs do not touch. The incubation period is 2-4 days, the fry immediately take food.
Sexual maturity at 6-8 months.
Corydoras pygmaeus Knaack, 1966.
Synonyms: C.hastatus australe, C.australe.
Inhabit reservoirs at the mouth of the river. Madeira (tributary of the Amazon river).
Length up to 3 cm.
The body is greenish with a silvery sheen. From the snout to the base of the tail there is a narrow black stripe ending in an oval spot on a white field.
In the abdomen from the abdominal to the middle of the anal fin is a thin black stripe. The fins are transparent.
The male is smaller.
Fish contain a group of at least 10 specimens in water 20-26 ° C, dH 5-15, pH 6.5-7.5.
Spawning in water 24-28 ° C, pH 6.5-7. The female lays caviar 20-40 pieces on plants or solid objects closer to the surface of the water.
The incubation period is 3-5 days, the fry swim in 1-2 days.
Plonsky V.D. (Encyclopedia aquarist)