The first egg layer I ever spawned was Betta splendens. I did this in a five gallon metal framed aquarium with no heater. Now those of you who know anything about how Betta fish love warm water for spawning are going to be a bit skeptical about this statement, but I kept the water warm by keeping the incandescent light in the metal hood lit continuously. I don’t know how those fish coped with no night time, but they did. Keeping the tank lit all the time had a side benefit. I wound up having a small culture of infusoria going in the tank, which provided a good source of food for the fry (the fry are raised in the same tank as they were spawned in). These days, I try to use a little more sophisticated methods to accomplish the same result.
he starting point for accomplishing this result is that I use floating water sprite (Ceratopteris thalictroides) as the support material for the bubble nest. Dwarf Gouramis particularly appreciate this plant as a nest site. The water sprite usually comes from a well established aquarium and I can’t confirm it as a scientific fact, but there seems to be an association of micro-organisms with the water sprite. These days I use fluorescent lighting, but I make sure that I have good intensity so that the water sprite, as well as algae, gets a good start in the spawning tank. As the breeders are being conditioned in the same tank, there may be left over food. A very small amount will also help the in-tank culture, but too much can spoil the tank. If the tank is not greening up with algae, I might also use a little trick that I learned from raising fry. I might put a very small amount of egg infusion into the tank.
Egg infusion is another time honored method of feeding very small fry. It used to be very common in stores, being sold under the name Liqui-fry as a first food for fry. I don’t see that stuff around much anymore, but that’s OK because it’s real easy to make for your self. All you do is hard boil an ordinary chicken egg.
Once it has cooled, you remove the shell and the white (you can eat the white if you like) leaving just the yolk. Put the yolk into a sealable container along with a volume of water about equal to that of the egg yolk. You may want to mash up the yolk with a fork a little bit before the next step which is to seal the container and shake it for all you’re worth. Others may want to use a blender or a food processor, but either way you get a suspension of very fine particles of egg yolk. As mentioned above, this can be used to help along the infusoria culture in the spawning tank, but it can also be used to feed the fry.
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Credit : Nice Betta Thailand