- Scientific Name: Corydoras metae
- Synonym: none
- Common Name: Bandit Catfish, Bandit Cory, Masked Cory, Meta River Catfish, Rio Meta Cory
- Family: Callichthyidae
- Origin: Colombia
- Adult Size: 2 inches (5 cm)
- Social: Peaceful
- Lifespan: 5 years
- Tank Level: Bottom dweller
- Minimum Tank Size: 10 gallons
- Diet: Omnivore, eats most foods
- Breeding: Egglayer
- Care: Easy to Intermediate
- pH: 6.5-7.0
- Hardness: 5-10 dGH
- Temperature: 72-79 F(22-26 C)
Corydoras metae was originally described in 1914, and subsequently named after Rio Meta, the river where it was first found. Rio Meta is a major tributary of the Orinoco River in Colombia, and is the primary river of the eastern plains of Colombia. The Bandit Cory is endemic to the small rivers and creeks in this region. It is widely available in the aquarium trade, and is among the most popular of the Corydoras species.
The Bandit Cory is aptly named, due to the black band that runs from gill to gill, going over the top of the head and covering both eyes like a mask. The body is pale beige with a pink tinge. All the fins are colorless, with the exception of the dorsal fin. The bottom two-thirds to one half of the dorsal fin is black, while the remainder is colorless. From the dorsal fin a black stripe runs along back ridge until it meets the caudal fin.
The black stripe then curves downward and runs parallel with the base of the tail, from top to bottom, then ends without continuing into the tail itself.
Two other species of Corydoras have coloration similar to the Bandit Cory. Corydoras melini, often referred to as the “False Bandit”, and Corydoras davidsandsi (known as Sands Cory) both have a mask as well as a black stripe running from the dorsal to caudal fin.
However in both of these species the black stripe does not end at the caudal fin as it does in the Bandit Cory. Instead it continues along the lower edge of the caudal fin all the way to the tip.
The False Bandit (Corydoras melini) has another striping difference. The black stripe along the back is actually two stripes, one on either side of the back ridge. When viewing from the side, a small sliver of the light beige body can be seen along the ridge of the back. This sliver of beige is the space between the two stripes. It is absent in the Bandit and Sands Cory, because they have a single stripe running along the back. The black stripe, as well as the mask over the eyes is much broader in the Sands Cory than the Bandit Cory.
As with other Corys, the Bandit Cory possesses several specialized fin rays. These rays are reinforced, quite sharp, and can be locked into a rigid position to defend against a predator that might swallow the diminutive Cory. The adipose, dorsal, and pectoral fins all have such spines. Keep these sharp spines in mind when attempting to net or handle Corys, as they can cut both net and skin.
Bandit Corys are among the armored catfish, which means they do not possess scales.
Instead their sides are covered by two rows of overlapping bony plates. Bony plates also cover their head. At the tip of the mouth, they have two pairs of soft barbels. These are highly sensitive to smell, allowing food to be easily located.
Bandit Corys are extremely peaceful, making them well suited to community tanks with small to medium sized peaceful fish. Always keep them in schools of at least three of the same species, preferably six or more. Never keep a single specimen, as it will become very timid. Solitary life for Corys often leads to a short lifespan.
As with all Cory species, the Bandit Cory forages through the gravel in search of food particles. Substrate with sharp edges can injure the soft barbels, which ultimately can lead to infection and even death.
Always use sand or small smooth edged gravel for Corydoras tanks, preferably dark in color.
Arrange the tank with open areas for swimming, as well as places to hide. Driftwood or bog-wood, as well as plants make a good place for hiding. Lighting should be subdued. The water should be soft, pH in the range of 6.5 to 7.0, and temperatures in the range of 72 to 79 F (22-26 C). Extended periods of lower or higher than normal water temperatures are not recommended for this species. Regular maintenance is important, as Corys are sensitive to poor water conditions. Salt, copper, and most medications should not be used with scale-less fish, such as the Bandit Cory. Use of such products can cause more harm than the malady for which they are used.
Easy to please, the Bandit Cory will eat a wide variety of foods. Flake food and sinking pellets or tablets, are the most common diet. Brine Shrimp, Daphnia, and Bloodworms should also be included in their diet, either freeze-dried or frozen. Whenever possible supplement with live foods.
Remember that the Bandit Cory is a bottom feeding fish, and will only eat food that sinks to the bottom. They also tend to be nocturnal feeders, as that is when they are most active. Give them a meal just before the lights are turned out for the day.
Bandit Corys are most easily sexed when viewed from above. The female will be much rounder and wider than the males. Males are smaller overall than the female. The ventral fins of the mature male are more pointed than those of the female.
Corys are seasonal spawners, responding to changes in the water chemistry and temperature that occurs during the rainy winter season. Mimicking these seasonal changes is a good way to induce spawning. This can be done by reducing the temperature, making the water softer, and lowering the pH (do not lower below 6.0).
Perform a water change every other day with water that is several degrees cooler than the tank. Adding peat to the filter or using blackwater treatment will reduce the pH while softening the water.
Test the water to ensure the pH is not too low. Anything below 6.0 can be harmful.
The spawning group should consist of two males per female, if possible. Condition the breeders with a variety of live and frozen brine shrimp and worms. The females will get plumper as they fill with eggs, indicating they nearly ready to spawn. At this point the breeders will become very active and lively. This activity may continue for a number of days before spawning takes place.
Activity in the tank will continue, going through periods of intense movement followed by resting periods. Females may remain stationary at times, as if not interested in what is going on. Males will dart about, or remain in place shaking their bodies. It is not unusual for males to engage in mock fighting. The instant the female moves, the males will become excited and spring to action, pursuing the female relentlessly.
When a female is receptive for spawning she will allow the male to caress her barrels and ultimately take up a “T” position in front of her head. While in this position the female brings her pelvic fins together, creating a basket into which she releases one or two eggs. The male subsequently releases sperm that fertilizes these eggs. Once fertilization occurs, the female swims away and finds a suitable site to place the egg(s). Males will eagerly await the placement of the egg, sometimes chasing the female before she is done. This process will repeat itself until 60 to 80 eggs are laid. Not all eggs are fertilized. Bandit Corys typically have a 50 to 80 % fertilization rate.
Adults will eat the eggs, so they must be separated. Many breeders find it easier to move the eggs, rather than the adults. If the eggs are affixed to plants, the entire plant may be moved. When eggs are attached to the glass, they can be carefully rolled off using your fingertip.
The rearing tank should have water of the same temperature and chemistry as the breeding tank. Use a sponge filter, and add a few drops of methylene blue to the water to prevent egg fungus. P Promptly remove any eggs that develop fungus. Cherry Shrimp are sometimes used in rearing tanks, as they eat diseased eggs, but will leave healthy eggs untouched.
Eggs will hatch in 4-5 days. In two to three days the fry will fully consume their yolk sacs, and should be fed freshly hatched brine shrimp. They may slowly be moved to larger foods as the fry grow out. During this time, daily water changes are necessary. The loss of large numbers of young fry is generally due to failure to change the water and keep the tank clean.