Originally Posted by Tx Oscar Lover
I have two oscars in a 175 gallon aquarium. About a month ago they laid eggs & the eggs hatched. About two days after they hatched they were all gone. I'm assuming the oscars ate them.
Well I went to my tank again & I actually witnessed my albino oscar laying eggs. Saw them come out the tube & everything. But I never saw my tiger oscar shoot any sperm on the eggs.
So my few questions are.
How soon would the eggs need to be fertilized by the male?
Second question, I have a few Severums in there as well. Is it possible for a Severum male to fertilize a female oscars eggs? Is that a possibility? I'm not entirely sure.
& my last question. Since I couldn't save any previous oscar fry, how should I go about it this time?
Thanks in advance for any help.
Congrats on the breeders
Oscar eggs need to be fertilized fairly quickly in order for them to remain viable. Usually, the male will follow the female when she is spawning and fertilize the eggs right after being laid. (I've witnessed this many times before as I used to have 13 pairs of Oscars breeding in one of my hatcheries.)
As for the Severums fertilizing the eggs, I highly doubt it's possible. There are a couple of other Astronotus species that may be able to interbreed with the Oscar but I really doubt the Severums being a good match. Keep in mind, cross breeds usually don't have successful fry or fertile fry. There are exceptions of course. To tell if the fish did fertilize the eggs, they should remain a clearish/ brown color after 24-36 hours. Dead eggs will turn white and usually do so fairly quickly. Something else to watch out for if they have been fertilized would be the eggs hatching but the fry not living past the egg yolk stage. These are all signs of a bad matching of fish.
Regarding your last question, there are 2 methods for raising eggs. #1 is to let the fish do it themselves. Oscars happen to be very good parents and I usually let my pairs raise their young until they were about a month old. Severums are also good parent fish so if you have a choice, I'd leave them in with the parents.
#2 is to artificially hatch out the eggs. This is done by removing the spawning site to another tank, filled with the water the eggs were laid in, with an air supply going over the eggs to keep them clean and oxygenated. Beware tho, Oscars can get really feisty when you try to take their eggs from them.
Lastly, you will find more success with spawning these fish if they are in a tank by themselves. Too many distractions can cause the males to be defending the nest instead of fertilizing the eggs It will also help you guarantee that the eggs are being fertilized by the right fish or it will show that the pair is not a fertile pair.
Hope this helps