Corydoras gossei is still not that common among hobbyists and breeding Corydoras gossei is even more unusual. It is however not that difficult, especially if you have successfully bred other Corydoras species in the past.
Corydoras gossei facts
Corydoras gossei is a catfish native to the Rondonia region of Brazil. These fishes can exceed two inches in length and must therefore be given a large enough aquarium if you want them to breed. The top half of the body and head are dark, while the lower half is white or yellowish. The fish is also decorated with orange-to-yellow markings, a color which can also be seen at the front spine of the dorsal and pectoral fins. The tail has undulating vertical stripes, while the other fins are more or less clear.
obtaining Corydoras gossei
Since Corydoras gossei is still quite uncommon in the hobby, many pet shops do not have them. If you are unable to locate a pet shop selling Corydoras gossei, an auction is probably your best bet. You can also take advantage of the Internet; there are many reputable aquarium shops to be found online. There are also online fish auctions in which you can participate. Do not hesitate to ask shop owners to order Corydoras gossei for you since many of them know how to obtain these fishes but not order them since the demand is so low.
The recommended way of obtaining a breeding Corydoras gossei couple is to purchase a group of juvenile specimens and let them grow up together. This way, they can choose their own mates when old enough to reproduce. Keeping more than one male seems to increase the chances of successful spawning.
Condition and trigger
You can use worms to get your Corydoras gossei in shape for spawning, since they are known to appreciate this type of food. Frequent water changes (2-3 times a week at least) also seem to increase the chances of successful spawning.
Spawning Corydoras gossei
During the actual spawning, the males will get really agitated and continuously circle the female. If you look at the pelvic fins of the female, you can see a clutch of eggs. She will mouth the males' anal vents, and then proceed to find a suitable spawning site. Breeding Corydoras gossei can use various spawning sites: plants, spawning mops, and flat surfaces such as aquarium glass or a flat stone. Providing them with several opportunities is therefore a good idea. Sometimes they will place one part of the batch in one place, and the rest somewhere else.
Egg and fry aquarium
To prevent the eggs from being eaten, you can move them to their own aquarium. If eggs have been attached to the aquarium glass, a razor blade will come in handy. A 2 or 3 gallon container is big enough to be the fry raising aquarium. Ideally equip it with a sponge filter, since the water quality must be kept up. Frequent water changes are also mandatory, and an air stone is recommended to keep the water well oxygenated. Place the airstone close to the eggs. If you cover the fry aquarium, you will have fewer problems with algae and the fry will also feel safer.
It is uncommon for all eggs to become fertilized during Corydoras gossei spawning, especially if the male is young. You will soon be able to see the difference between fertilized and unfertilized eggs. The unfertilized eggs will attract fungi and bacteria and start to decompose; they must therefore be removed to prevent such attacks to spreading to the fertilized eggs. You can for instance use a thin air line tube and siphon them out.
Egg and fry development
The eggs will hatch after roughly one week. Infusoria is a good first food, which can be supplemented with micro worms as the Corydoras gossei
fry grows older. Eventually, your fry will be large enough to feed on newly hatched brine shrimp. Frequent water changes and optimal water quality is really important if you want a high survival rate when breeding Corydoras gossei
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