Is this Swordtail a girl or a boy

SM1199

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If this fish was not of a thread fin strain, I would say it's male, given the extended analfin. However, knowing that this strain produces long trailing fins, even on the analfin, it looks like a female. I see a gravid spot.
 
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Lululime

Lululime

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SM1199 said:
If this fish was not of a thread fin strain, I would say it's male, given the extended analfin. However, knowing that this strain produces long trailing fins, even on the analfin, it looks like a female. I see a gravid spot.
Thank you! I think so too. I am not an expert, but she does have that triangle looking fin, not like her boyfriend, who is lacking that triangle looking fin. Hope I am making sense, here is a pic of the boy.
 

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SM1199

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Yes, you are completely right. The comparison photo makes it even more clear. Good eye!
 

emeraldking

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Well, the red wagtail (black fins) is a female lyretail sword and the the other red lyretail is a male. No doubts!
Female lyretail swordtails do have an elongated analfin as well but it's not transformed into a gonopodium. This male however does have an analfin that has clearly transrformed into a gonopodium.
 

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