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Is there a way to sex either of these without venting?

I have noticed on my Blue Rams that some have a red/pinkish stomach while others do not...is that a marker for determining sex?
 

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Blue rams are easier than bolivans ... the females have the pinkish tummy and male's dorsal rays on 2 and 3 are extended ... for sexing bolivians, see the BRC thread ... great pics there for that species, which isn't as easy to tell as the blue rams.
 

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Hey, regarding sexing Bolivians, see here!

http://brc.moonfruit.com/

:D

You want to look in the Articles section ;).

Blue Rams make life nice and easy for you:

Shorter/plumper/pinky-purple belly, shorter pelvic and dorsal fins, iridescence inside the black spot(not always an indicator but pretty common) = Female.

Higher bodied, slightly thinner, generally longer pelvic and dorsal with 2nd-4th rays (usually only two) elongated, lack of pink-purple belly and usually lack/less iridescence inside the black spot (on the flank of the fish) = Male.

Female. You can see that even she has an extended dorsal ray:
In detail-


Showing the iridescent spots inside her black spot:


Typical purple belly - breeding dress:


Male:
Two different physiques:


This male shows the higher, flatter body physique that I talk of:


Blair.
 
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