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Some show the black blotch on the dorsal fin that typically identifies with females in many other species. Oddly enough, they are the two more dominant fish that I thought were males?

Robertsoni don’t or shouldn’t have that blotch. Dominant fish could be male. When looking at pics of pairs, males seem to have a more sloping head shape. This robertsoni I knew was female because she laid eggs.

D8ED290E-74E5-4344-BE27-0FF2BBF381AC.jpeg 591AC5AA-ADDF-49F0-A374-70D059E334E1.jpeg 797C6014-D662-4CA0-A24A-3A49668948A9.jpeg 1A0FD7F3-4DF4-40C0-9B6C-063BBDDEF96E.jpeg
 
The one on top pic looks stressed, and that is why you see black. Was it fighting w/ something else?
 
The one on top pic looks stressed, and that is why you see black. Was it fighting w/ something else?

The two dominant (and largest) fish often show that coloration. Especially when they are fired up from feeding or squabbling with others.
 
Chris,
I know I keep going on about diquis but the barring on your fish forms a prominent y near the mid lateral spot.
This trait is shared with diquis . Not saying that your fish is diquis but I wonder if robertsoni and diquis natural range over laps and natural cross breeding occurs like in thorichthys ?
I could be talking complete rubbish but it's a plausible theory if they do indeed cross ranges.
Have a look at some images of Cribroheros diquis and see what you think.
 
Chris,
I know I keep going on about diquis but the barring on your fish forms a prominent y near the mid lateral spot.
This trait is shared with diquis . Not saying that your fish is diquis but I wonder if robertsoni and diquis natural range over laps and natural cross breeding occurs like in thorichthys ?
I could be talking complete rubbish but it's a plausible theory if they do indeed cross ranges.
Have a look at some images of Cribroheros diquis and see what you think.

I really think they are simply a variant of C. robertsoni. I have came across multiple other individuals with similar specimens. Check out this page, it shows the variation of robertsoni from different collection points.

https://www.ciklid.org/artregister/art_slakte.php?ID=Cribroheros#247
 
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Here are three different collection points of C. robertsoni.

*None of these are my fish or my pictures. Photo credit given to the original owners.

Collection Point: Lago des la Illusiones (Bruce Vandeweghe)
RobertsoniBruceVandeweghe.jpg

Collection Point: Quebrade de Barracon (Christian Hofer)
RobertsoniChristianHofer.jpg

Collection Point: Rio Jutiapa (Jim Cumming)
RobertsoniJimCumming.jpg
 
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Here are three different collection points of C. robertsoni.

*None of these are my fish or my pictures. Photo credit given to the original owners.

Collection Point: Lago des la Illusiones (Bruce Vandeweghe)
View attachment 1299276

Collection Point: Quebrade de Barracon (Christian Hofer)
View attachment 1299277

Collection Point: Rio Jutiapa (Jim Cumming)
View attachment 1299278

I agree. They definitely look like Jim’s fish.
Where did you find these pics of collection points? I’ve been looking to see differences in collection points for a long time. There isn’t much info and a lot of the time collection location isn’t mentioned when for sale.
Thanks for posting this! I see differences in mine now and the one I had.
 
I agree. They definitely look like Jim’s fish.
Where did you find these pics of collection points? I’ve been looking to see differences in collection points for a long time. There isn’t much info and a lot of the time collection location isn’t mentioned when for sale.
Thanks for posting this! I see differences in mine now and the one I had.

These pics are directly from the link I posted in response to Stan. If I had to choose a collection point that my fish look the most like, it would actually be the second image, Quebrade de Barracon. That fish looks identical to my group. The cheek spangling is what seperates it from Jim's fish, as his have many small dots vs the lesser appearance of the larger smeared smudges of the other.

Thinking back, when I picked mine up I wish I would have taken a picture of the largest specimen they had. It was a large male that was around 8". I imagine he was the original father of all the others. I would have grabbed him but he didn't look to be in the best shape and was blind in one eye.
 
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