B. brownorum is one species where I prefer a male-dominant sex-ratio. So of course I end up with only two males and about three times as many females in my F1 group. I currently have the wild-caught pair separated out in the hope they will spawn. I've increased the water temperature several degrees in the breeding tank, so it's about 27-28°C (the water temperature for previous spawns was around 24°C). I will also be testing the pH of the breeding tank and the pH of the main tank to see if there is any difference between the two, and what effect if any, this has on the sex-ratio of future spawns.
The fish photographed above, is one of only two male offspring produced by the wild-caught pair. I do have a third young male that is the offspring of Zig-Zag (the result of an F0 x F1 pairing) and a daughter of the current wild-caught pair.
Interestingly, none of the young females have developed a lateral blotch. My current wild-caught female had only a very faint blotch on one side that has since faded completely. As the same was true of my previous wild-caught female, I question whether the presence or absence of a lateral blotch in at least the female offspring, is influenced in some way by the presence or absence of a lateral blotch in the breeding female.
Unfortunately, changes in Australia's quarantine laws mean it's unlikely I will ever be able to test my hypothesis, being that I can no longer import fish from my preferred overseas sellers. However, if anyone reading this post has any thoughts on the matter, feel free to drop a reply in the comments section.
Hailing from Melbourne, Australia, I currently keep and breed a number of species from the coccina complex.