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Need help sexing Apistogramma Macmasteri

Ale Kadu

New Member
Messages
3
Hello all!

I recently bought these two A. Macmasteri. The guy from the fish shop assured me he was selling me a male and a female, but I'm not so sure.

Picture A he said was a male:

IMG_20230206_181539833.jpg


And picture B he said was a female:

IMG_20230206_181453442.jpg


The Macmasteri in picture B is much smaller, about 2.5 inches while A is about 3.5 inches. In terms of behaviour, A keeps chasing B.
Thanks!
 

Apistoguy52

Active Member
Messages
275
Looks like a couple girls to me, but at 2.5” and 3.5”…those would be some of the largest female Apistogramma I’ve ever seen
 

Ale Kadu

New Member
Messages
3
Thanks Apistoguy52! And yes, I got my measurements all wrong, sorry. The correct ones are 3.2cm (1.2in) and 3.8cm (1.4in), indeed not giant females :-D
 

MacZ

Well-Known Member
Messages
2,958
Location
Germany
And yes, I got my measurements all wrong, sorry. The correct ones are 3.2cm (1.2in) and 3.8cm (1.4in), indeed not giant females
At these sizes (under 4cm) sexing Apistos is not very reliable anyway. How did you get that precise measurements? I can't get more precise than +/- 0.5cm without catching the fish and just for measurements that would be unnecessary stressful. For me and the fish.
 

Ale Kadu

New Member
Messages
3
At these sizes (under 4cm) sexing Apistos is not very reliable anyway. How did you get that precise measurements? I can't get more precise than +/- 0.5cm without catching the fish and just for measurements that would be unnecessary stressful. For me and the fish.
In the morning when the lights are out, they stay quite still in their favorite spot, in the back corner of the tank very close to the glass. As they are not scared by me, I could easily measure using a ruler.
 

MacZ

Well-Known Member
Messages
2,958
Location
Germany
That's my method, too. I have a piece of measuring tape I can stick to the glass and wait for the fish to be close to it. But the thickness of the glass and the water itself have an influence. That's how I get to the deviation of +/- 0.5cm.
 

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