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A rare import so it might take a while to find them. I had a pair back in 1984 when it was called Crennicara sp. Rio Negro. I personally haven't seen them since.
Nice looking tank. Your idea of only 1 apisto is great. A. cf. agassizii Netz forms do occur in the Rio Negro, but only the lower part. C. duplicareus and Cardinals (until this tetra escaped from holding pens in Manaus) are only found in the upper Rio Negro.
A. diplotaenia is not found in the same habitat as discus, if that matters to you. They live among rocks and sand ripples in major river channels, but not in jungle-covered streams.
The last photo shows a male. Your photos demonstrate the problem with using limited photos that do not show multiple pictures of the fish in different behavioral moods.
It is a color-enhanced domestic strain that you have. Even females can show masculine features so it is hard to sex this fish. Wild fish? Easy. Domestics? Not so much. Other than egg laying and becoming more yellow when brooding fry, females should have shorter, more blunt tips on the anal and...
It's very unlikely. A. panduro females do not exhibit these patches until they reach maturity. Until then they typically exhibit a lateral band or a much smaller lateral spot.
I have a similar experience with A. wolli. All of the females that TomC and I caught had one spot on each side. The same is true for females in the type series in the original description. All were collected in a known site in the wild. After many generations of offspring I get those with 2...
No, not really to the fish. You will never know what colors will appear. Only in line-bred domestic strains of A. borellii will you get most specimens to appear the same.
If only one male in the tank why would it mascarade as a female???
Juveniles of apistos all tend to show female features.
Exactly what is expected.
Ventral patches are the large black blotches that show on the ventral area, usually below the lateral band, on females of most nijsseni-group...
I wouldn't worry about color. It certainly isn't Opal (whatever that is). If you look at TomC's site (https://www.tomc.no/page.aspx?pageid=127) you will see that there are at least 3 and probably many more species under the A. borellii name. Most of these species are polychromatic to some...
I have never seen a male with a ventral patch. This is a female trait in some female A. panduro. Other have a more vertical patch (Brustband). I am guessing that these are domestic fish. If so, anything is possible especially if highly inbred.
Yes and they are from different areas of South America. On another note you probably will encounter problems mixing your apistos with other bottom-dwelling fish especially when they try to breed (and they will try).
In a word, no. This plan has 2 strikes against it. #1 is the electric blue acara (Andinoacara pulcher, probably) is more peaceful than other members of the genus like Green Terrors but is more territorial and aggressive than most apistos. #2 breeding apistos - and they will if both sexes are...
The Rio Jurua/Yurua is a river found in western Brazil although a few of its headwater streams do originate in eastern Peru. 'Yurua' is the Portuguese spelling and 'Jurua' is the Spanish spelling for the same river. I get the feeling that I know the Peruvian collector/exporter. He often goes...