Clamped Tail

[zenryoku]

I have two guppies that are pregnant in a breeder. Today I noticed one of them has her tail fins clamped up. What does this mean. Otherwise she appears fine. What does this mean, is she sick?

[kimmers318]

Generally clamped fins mean stress of some type, whether it be illness or stress. How long have you had her in the breeder? How long has the tank that she is in been running? What is your tank maintenance like?
I had a female platy who for some reason was harrassed more so than the other platy by tankmates and would clamp her fins as a sign of stress. Once she was put into a different tank with different tankmates she was fine.

[Abbeys_Mom]

It's stress or water conditions. I lost 5 Sparkling gouramis to high PH and the first symptom was clamped tails.