For Hybridization to be true commercial application it needs to provide consistent results and be maintainable. Keeping two species pure and separate at a single facility has proven nearly impossible. Getting pure horonorum now is just about impossible.

YY males (AKA super males) seems to be the way to go. These can be developed without chemicals or hormones by just about anyone, but it is time consuming without the ability to do genetic testing.

The process is simple. Raise a batch of fry at cold temperatures ~70F for the 1st 30 days. This will produce mostly females with about half being genetically male. Breed those back to normal males and 1/4 will be super males. Without genetic testing, these super males need to be ID'd via breeding and checking the sex of the offspring.

You can buy super males, but they are costly and all are hormonally produced.