Introduction
Corydoras nattereri is a beautiful catfish that displays blue-green stripe over a golden-grey body. They normally reach a size of 5 cm and are native to coastal rivers in southeastern Brazil, from Espírito Santo to Paraná. The preferred dH range is 2 – 25 and the pH-value should must be kept between 6.0 and 8.0. When keeping Corydoras nattereri, the water temperature should be colder than for most other Corydoras species, ideally 22º C (72º F). These fishes appreciate a planted aquarium; you can for instance use Java fern, Java moss and Amazon sword. Feed your Corydoras nattereri a varied diet that contains meaty foods as well as high-quality prepared food. Bloodworms, brine shrimp, catfish tablets and flake food are a good combination.
Triggering
Environmental changes seem to play a key role when breeding Corydoras nattereri. You can for instance cause a change in pH-value by using really alkaline water (8.0-8.5) when doing a 25% water change. If you normally keep the pH around 6.0, this will produce a noticeable effect and might trigger spawning. You can also make a substantial water change use water that is colder that the water in the aquarium. The temperature should drop by at least 2 degrees. As with most Corydoras, Corydoras nattereri seem to be more eager to spawn when kept in group containing several males.
Multiple spawnings
When spawning has taken place the first time, you can remove the eggs and make a new major water change. This can trigger the fish to spawn a second time and you will get more eggs.
Egg and fry rearing
Most Corydoras nattereri breeders raise the offspring in a separate aquarium to safeguard them from adult fish. If you decide to remove the eggs from the parents, you can use Methylene Blue to prevent fungi infestations. Also place an airstone next to the eggs to provide them with oxygen and water movements. As soon as you notice any unfertilized eggs, they must be removed, since unfertilized eggs will function as breeding grounds for fungi and bacteria that can proceed to attack the fertilized eggs as well.
Fertilized eggs will be tan colored at first and then gradually become darker until they hatch. After a few days, the fry will be free swimming. At this point, they are normally no longer than 1/8 inch.
Plenty of water changes are mandatory if your want to raise Corydoras nattereri fry, and some type of mechanical filtration is also recommended.
Fry food
You can start out with micro worms and then proceed to newly hatched brine shrimp. Larger and larger brine shrimp can then be used as the fry grow bigger. Keep in mind that live food can pollute the water; frequent water changes will be necessary. Small and frequent water changes are better than one big change once in a while, since Corydoras nattereri fry do not handle rapid alterations well.
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