As to why only males are sold, we have ourselves to blame. Imagine a tank in the LFS, filled with killies of both sexes. Males are colorful, females are drab by comparison. For non-breeders who want to brighten up their planted tanks, chances are only the males are sell-able. Let's be honest here... how many breeders are there amongst us and who else will buy the females?
I had the same issues when I consigned young pairs or trios to EcoCulture and I did insist on them being priced as such; pairs or trios. If you want only a male, you still pay for a pair or a trio. My main intention was to minimize that species being lost to the hobby. At least there was a chance that somehow, somewhere, someone still have killie fry in their tanks!
In my early days of killie keeping, there were no such options and I often pass on a species when I don't see any females. Sadly, those females that were 'bundled' with the colorful males were often of another species. Heck, I was a newbie then and could only trust the LFS. No surprises that I didn't manage to breed any of my store-bought killies.
As to why nobody wanted to breed these jewels... many reasons.
Unlike bettas, cichlids or guppies which are very prolific throughout the year, killifishes are not and for non-annuals, they breed best during the monsoon season; ie. low temps.
Some don't like the idea of collecting and incubating eggs. Too troublesome going through the effort and waiting just to get fry. Unfortunately, for annual-species's eggs to develop properly, incubation in peat is mandatory.
Lastly, nobody wants to breed them because nobody wants any!! Heck, to encourage local hobbyists to start killie-keeping from eggs/fry, I tried selling groups of fry at very affordable prices... pathetic response.
Even when I initiated species maintenance programs, it attracted more free-loaders via PMs than the genuinely interested. For those that did try, Lady Luck wasn't on their side. Heh...what more can I say??
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