Sexing Indian glassfish

[Trainer_Ruby_]

I added 3 new glassfish to my 55g to finish the school and want to identify their genders. I know the makes get bigger but is a black spot behind their gill also a sign? The 2 I had before are fully grown(as far as I'm aware) and the male also has this spot.


Keep calm and drum on

 

[Gillie]

Males will have a blueish edge on their dorsal and anal fins, I've never heard of a black spot being a factor.

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[Trainer_Ruby_]

So I checked the young ones I have. All the ones with a black spot also had blue on the tips of their dorsal fin.


Keep calm and drum on

 

[Gillie]

I just ran across something while looking for a possible reason that your fish are so big. It seems that males do develop a black tip on the swim bladder so thumbs up on the observation.

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