Corydoras melanistius, also known as the Spotted Corydoras or Black Sail Corydoras, belongs to the family Callichthyidae. These fish are native to northeastern South America, specifically the coastal regions of Guyana, Suriname, and French Guiana. Their natural habitat includes slow-flowing waters, ponds, backwaters, and tributaries of larger rivers. It is important to note that despite inhabiting coastal areas, this species is not adapted to brackish or saltwater.
Adult fish of this species can grow up to 6 cm in length. The main body color is silvery, often with a yellowish tint, which can change depending on lighting conditions. The body, as well as the caudal and other fins, are adorned with numerous small dark speckles. A characteristic feature is the broad black stripes on the head and dorsal fin, with the latter being almost entirely dark in color.
The species inhabits water bodies in South America: in Guyana, Suriname, and French Guiana. It populates coastal areas of rivers, tributaries, backwaters, and small lakes with slow currents. In nature, it prefers areas with sandy bottoms, with typical water parameters: temperature 22–26 °C, pH 6.0–7.0, general hardness 2–15 dGH.
A peaceful, schooling fish that is active during the day. It is recommended to keep them in groups of 6–8 individuals, as solitary keeping leads to stress and increased susceptibility to diseases. Compatible with most non-aggressive fish species that inhabit other water layers.
For a group of 6–8 individuals, an aquarium of at least 100 L is required, with a soft sandy substrate to prevent injury to their sensitive barbels. It is important to provide hiding places in the form of driftwood or rocks. Effective filtration, aeration, and weekly water changes of 20–30% of the volume are necessary. Lighting should be moderate or subdued.
An omnivorous species. In the aquarium, it accepts all types of quality sinking foods: specialized dry granules, tablets for bottom feeders, and frozen foods. The diet should be varied to avoid nutrient deficiencies.
Spawning is paired or in groups, occurring on a prepared substrate. The female lays eggs, which she then carries between her pelvic fins to attach to plants or glass. Fry begin to swim freely after a few days and require feeding with small live foods, such as Artemia nauplii.
Fish are prone to bacterial infections with poor water quality and high organic content. Main symptoms include fin rot, body ulcers, or cloudy eyes. Prevention involves maintaining substrate cleanliness, regular water changes, and avoiding overpopulation.
When purchasing, choose active individuals with clean fins, without visible ulcers, film, or skin damage. It is important to ensure the integrity of the barbels, as their absence indicates improper keeping conditions. A healthy fish should show interest in searching for food on the bottom.
The essentials: size, tank volume, water parameters and care
An adult reaches 5–6 cm in length. Plan the tank around the maximum size: the fish quickly outgrows a cramped setup.
The recommended volume is 100 L. A smaller tank speeds up nitrate build-up and raises stress levels.
Temperature 22–26 °C, pH 6–7, hardness 2–15 dGH. Stability matters more than exact values: sudden swings are harder on the fish than a small deviation from the ideal.
Around 5 years when kept properly. Lifespan depends directly on tank volume, water quality and a varied diet.
Temperament: peaceful (regular). Keep this in mind when choosing tank mates.
Recommended setup: medium group (6–8 individuals). Ignoring this is a common cause of stress and disease.
Diet type: sinking (any). Feed small portions that are finished within a couple of minutes — overfeeding does more harm than underfeeding.
The scientific name of the species is Corydoras melanistius, family Armored Catfish (Callichthyidae). It also appears in the literature as: Corydoras wotroi.
The water suits 197 of 208 plants in the catalogue — the easiest ones are shown first.
Afzelius's AnubiasAnacharisAnubiasBrazilian PennywortDwarf CloverDwarf CloverDwarf HygrophilaDwarf SagittariaDwarf ValGuppy GrassHornwortJava FernJava MossMoneywortMud SwordNair's LagenandraNarrow Leaf AnacharisNarrow-leaf CloverStringy MossSüsswassertangTaiwan MossTape GrassTemple PlantUssuri Watermilfoil
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