31 May CORYDORAS – Catfish – facts info
Name and family:
Featuring and behavior:
All species of the genus Corydoras are characterized by a squat and compressed body at the sides, all of which are protected by a shell consisting of 2 rows of vertically arranged plaques. Its head is round and massive, with its muzzle a conical shape (the profile appears triangular): the mouth has 2 pairs of sensory beads on the sides, with the function of finding nutrition between the anfratts and the substrate. This operation is possible thanks to the presence of taste buds located on the beetles so that organic debris can be found edible also in waters with remarkable turbidity and the presence of muscle fibers that make them mobile, useful for digging, extracting worms and other organisms Plants and animals from the sandy bottom. The shape of the mouth also acts as anchoring (imitating a suction cup) in case of strong current. The dorsal fins and the pectorals are equipped with robust aculeus with defensive functions. The caudal fin is rather prickly, with a marginal margin and slightly engraved.
A typical characteristic of this genus is the ability to integrate oxygen deficiency dissolved in water with atmospheric oxygen through an evolution of the intestine: this organ is in fact greatly vascularized and has the thinnest endothelium in the back: this allows the fish to ingest air with the mouth by pointing to the outer surface of the water that is then oxygenated. Carbon dioxide is expelled from anal orifice.
It is a fish that lives in a pack and should be introduced into aquariums in groups of at least 5-6 specimens, It is recommended to devote 15 liters to a specimen.
The best fund is sand, in fact, the Corydoras like “grufular” in the sand, and too much sand or, worse, sharp edges could damage the delicate beasts of these animals, which would risk dying of starvation. Only really important thing, a good amount of greenery, so we devote them very well-planted tanks.
Sexual dimorphism and breeding:
There is not much dimorphism: the females appear slightly touched, they also have a rounded dorsal fin, unlike the males in which it appears slightly pointed. However, differences are not always appreciable with ease. It is a sheepfish, the female of the couple will deposit the eggs on the furnishings or on the bottom; Then they will be fertilized by the male. There is no parental care and therefore we recommend separating the parents.
Feeding and maintenance:
Maximum dimension: 3 – 10 cm
Swimming level: bottom
Ideal temperature range: 23° – 26° celsius
PH range: 6,3 – 7,5
GH range 5 – 10