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In my experience if there is a trace of a pattern on the caudal fin in young fish they always turn out to be males. Female D. maculatus develop red anal fins, as opposed to D. filamentosus, which have red ventrals.
My tap water is very soft - 31 ppm TDS. I've bred many species of Apistogramma without encountering this problem. The only similar case was a pair of A. macmaster which never produced fry, former inhabitants of the same tank the agassizii are living in now. This tank, unlike any of my others...
Back in June I acquired a young pair of Apistogramma agassizii Blue Flame. Since then, they've grown into spectacular specimens, but so far no fry. The female shows brood care behavior but abandons the cave after a few days. On two occasions what appear to be fungused eggs have shown up outside...
You might want to give Crenuchus spilurus a try. They’re cave spawners like Apistogrammas, very hardy and usually quite inexpensive. I kept mine with 3 Discrossus filamentosus males, whichI later rehomed, as I was unable to locate any females.
Body shape is also an indicator. Curviceps are more elongated as opposed to the stockier dorsigera. In addition, fully grown curviceps males have very long ventral fins. The two species are actually fairly easy to differentiate if you know what to look for.
The difference in fully grown adults is very apparent. Males are substantially larger with nuchal humps. In my stock, however, there was never much difference in fin length between the sexes.
I would sell unsexed juvies in groups of 6 or 7 or pairs if I was absolutely sure of their sex on Aquabid before shipping became a nightmare thanks to the pandemic. I'd also donate to local aquarium society auctions to help support the clubs & bragging rights. At one point my hobby became...
Update: One of my runts has developed a unique coloration (the burgundy patches). He’s fathered many young and my hope is they’ll reach full size and inherit his appearance.
Same conditions as always. I had the pair separated for a few weeks when they weren’t getting along, & after I removed the divider none of the eggs were viable.
I have a pair of Laetacara araguaiae that was born in November 2019. They spawn every week or so & formerly produced many young. Lately, however, all of the eggs turn white soon after spawning. Can this be remedied or is my male permanently infertile?
A while back I had a large spawn of wild Apistogramma cacatuoides. After eventually rehoming the larger specimens I discovered about a dozen much smaller individuals remaining in the grow-out tank. Since then they've grown somewhat & have begun to produce fry, although at over a year old they're...