Heres a pic of my male jag. See how his pattern differs from yours. Females have less spotting especially around the jaw. I have seen pics of pairs where females look allot like males with lots of spots but your pics of the vent confirm at least to me that its a female.
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I dont have any vent pics of my male but heres what they look like. Male vent looks like O>. Females look like OO or U shaped instead of v shaped like the male. You can google vent
Pics and compare them to your pics.