Aggressive Swordtail

[flying_scotsman]

My female marigold wag swordtail is trying to nip other fish in my tank including the male swordtail, any idea why this is happening? She seemed fine before.

 

[WILDER]

Is she fat and about to give birth.

 

[flying_scotsman]

Is she fat and about to give birth.

I've just had a quick look and her abdomen is more swollen that the males, I've only been keeping fish for about a month so I really would'nt know the difference. I suppose I'll find out so enough if she is

 

[WILDER]

As she just started nipping, as they get moody before giving birth and chase fish away.

 

[flying_scotsman]

Certainly sounds like that, I've had her for a couple of weeks and have never seen this kind of behaviour before. Shes particularly going for the black widows.