Pygmy Corridor (Corydoras pygmaeus) Knaack, 1966
Corridor Pygmy is a miniature fish with an elegant and strict color. A great choice for a small aquarium, C. pygmaeus is one of the few tiny species of Corydoras. He is most often confused with Corydoras hastatus,
Catfish sparrow (Corydoras hastatus)
although it is easy to distinguish dwarf catfish – C. hastatus has a dark diamond shape at the base of the tail fin and there are no additional markings on the body. Then, as C. pygmaeus has a dark stripe along the entire length of the lateral line.
Habitat: inhabits tributaries of the Madeira River, which flows in Brazil. It prefers to stay in silted areas with little current or in standing waters.
Description: body shape is slightly elongated, the sides covered with bony plates are flattened, the line of the belly is straight. Strongly developed abdominal and pectoral fins, on the last a prickly ray.
The tail fin is two-bladed. There is a fat fin.
On the jaws are several pairs of gentle antennae.
Common color is greyish olive. Near the snout begins a black stripe, which stretches down to the tail and ends with a rounded dark spot.
On both sides of the black stripe are two white. All fins are transparent.
The females are larger and their belly line is more arched. Fish can also be distinguished by the upper end of the dorsal fin, which is rounded off in females, and sharp in males.
Pygmy Corridor – female and male
The size of the females of the pygmy corridor is 3 cm, the males are slightly smaller – 2.5 cm.
Pygmy Corridor – couple
Arrangement and parameters of the aquarium: Pygmy catfish in nature always live in flocks, so it is advisable to keep at least 6 fish in the aquarium, preferably 12-15. In a company of relatives, they feel more confident, become more active and better show all the features of their inherent behavior.
For the group of catfish you need a capacity of 40 liters, sizes from 45x30x30 cm.
It is very important to choose a primer that should be soft, preferably a dark color. Sand and small pebbles are best. Fish love to dig around in the ground, so neither in it, nor in the scenery should not be sharp edges, which corridors can be injured.
Be sure to have a large number of shelters: caves, caves, snags. Several large and smooth stones will be a resting place for catfish.
Plants should be planted around the perimeter of the aquarium so that there is enough free space at the bottom.
Pygmy Corridor (Corydoras pygmaeus) love to lie on the broad leaves of Echinodorus and Anubias. Illumination is necessary not bright, better scattered.
Water parameters: 22-26 ° С, dGH up to 15, pH 6.4-7.4.
Rummaging in the ground, corridors raise dirt from the bottom, so a filter and a compressor are needed. Changing 1 / 3-1 / 4 of the water in the tank should be done weekly.
Somiki pygmies are absolutely peace-loving fish, but, given their tiny size, only the same peaceful and small species will suit their neighbors: rainbow irons, South American tetras, rasbora, dwarf cichlids, shrimps.
Nutrition: unpretentious in food and take any food: dry flakes, daphnia, Cyclops, tubule, Artemia, tablets and pellets for bottom fish. Catfish have a very small mouth and therefore feed should be small.
Reproduction: if the pygmy corridors are kept by a flock of at least 12 individuals without neighbors, then breeding is not difficult and occurs without human intervention. Somik do not eat caviar and all that is required for growing fry is to feed them in time.
If the school is smaller or there are other fish in the aquarium, then 1-2 females with 3-5 males are deposited in the spawn with a volume of 10 liters or more. Pair spawning is also possible.
It is desirable to keep the producers separate for some time before spawning, and it can be stimulated by daily water changes of 50-70% for a cooler one.
spawning tank example
Water parameters in the spawning aquarium: 24-25 ° С, dGH up to 6, pH 6.5.
Spawning should be darkened, leaving one well-lit wall. The female can lay eggs on the glass, so it should be placed in the spawn, setting near the illuminated wall.
The performance of the female pygmy corridor is from 30 to 100 eggs.
Producers after spawning are deposited or the eggs together with the glass are placed in the incubator. The temperature in the containers with caviar needs to be increased by several degrees and methylene blue is added to make the water a light blue color.
This will prevent the formation of fungi on the calf.
note: Some lovers use certain types of freshwater shrimp that distinguish spawn-infected eggs from healthy ones. Shrimp cherry one of the options.
They eat infected caviar, but leave healthy unharmed.
The larvae hatch for 3-4 days with the yolk sac, due to which they feed for the next 3 days. You can start feeding the fry by infusoria, and then by nauplii of artemia.
At 3 weeks of age, fry development slows down. Color of fry Pygmy Corridor (Corydoras pygmaeus) different from the colors of adult fish.