Hognose Cory (Corydoras treitlii)
Family: Callichthyidae, Subfamily Corydoradinae
Common Name: Hognose Cory
Origin and Habitat: South America, coastal drainages in north-eastern Brazil. The type specimen was collected in a tributary creek of the Rio Parnaiba, near Alto Parnaiba, Maranhao, Brazil. The fish remains in freshwater.
Compatibility/Temperament: Absolutely must be in a group, minimum five if alone (sole species) but in mixed cory species no less than three but more is preferable. Very peaceful.
Hognose Cory Diet
Naturally feeds on crustaceans, small worms, insect larvae. Readily accepts prepared foods that sink such as tablet and pellet; frozen bloodworms and live worms are relished as treats.
Attains 7 cm/2.5 inches.
Minimum Tank Suggestion
36 inches in length.
Water parameters for Hognose Cory
Soft to moderately hard (2-25 dGH), slightly acidic to slightly basic (pH 6 to 8), temperature 20-25C/68-77F.
This is one of the long snout corys, hence the common names of Longnosed Cory and Hognosed Cory. There are no reported cases of breeding [source: Planet Catfish] and available fish will be wild caught and thus seasonal.
This species likes to dig into the substrate searching for food, perhaps more than some other corys. A sand or fine gravel substrate will allow for this; the sand/gravel particles must be smooth to prevent irritation and damage to the sensitive barbels and snout. Chunks of bogwood should be added, and live plants. Provide some open areas, and subdued lighting which may be partly achieved with floating plants; most cory species do not appreciate bright lighting.
Females are rounder when viewed from above, but otherwise there are no external gender differences.
The Corydoras are quite sensitive to water parameters and quality, and highly intolerant of salt, chemicals and medications. Signs of stress usually begin with rapid respiration, then lethargy (often just "sitting" on plant leaves, wood or the substrate respirating heavily, sometimes near the surface) and sometimes rolling onto one side. At such signs, a partial water change of at least 50% with a good water conditioner should immediately be made, and appropriate steps taken to remove the cause. Any sudden fluctuation in water chemistry or temperature often induces shock, causing the fish to "faint" and fall over on its side. Corydoras introduced to new aquaria will settle in better if the tank is established; corys do not adjust well to a new aquarium with still-unstable water conditions and fluctuations.
The dorsal, pectoral and adipose fins are each preceded by a spine which is actually a hardened and modified ray; the pectoral fin spine can be "locked" into position by the fish; care must be taken when netting corys not to entangle these spines, which can also give the aquarist a nasty jab. They are believed to be a defense adaptation, to lodge the fish in the throat of a predator.
All species in the genus will periodically and fairly regularly swim quickly to the surface for a gulp of air. The fish swallows the air and blood vessels in the hind gut extract oxygen from the air; it is then expelled through the vent the next time the fish breaks the surface for another gulp of air. This adaptation is believed to have evolved so that the fish can survive in poorly-oxygenated water such as drying pools during the dry season. It is however essential to the fish's well-being that it regularly swallows air.
This species was described in 1906 by Franz Steindachner; the species epithet honours a Mr. Treitl. The name of the genus, which was erected by B.G.E. Lacepede in 1803, is derived from the Greek cory [= helmet] and doras [= skin, incorrectly used here for "armour"]; it refers to the dual row of overlapping plates (instead of scales) along the body, comparable to a suit of armour.
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