as previous post

this pleco was bought as female bristlenose..

she is showing signs of aggression to all other pleco's whether male or female....
she as now been isolated to a smaller tank...

never had a female bristlenose this aggressive before....


she is probably only about 4 inches but quite chunky right now,....

she as killed numerous guppies, and now a siamese male fighter...


many thanks in advance

looks like a common female to me mate, and agression can be shown by any species, i have a young male who ive had in isolation for 2 months because he was so agressive towards everything untill my largest male gave him a good seeing to at that point i had to move him and help his wounds heal, i put him back in last night and guess what?? he goes straight back to my largest males cave and kicks off again... he will not learn so i guess a few more days and he will get a pasting again.....

If she is fully grown mate then she may continue to behave this way all the time untill she dominates everything in there.....it could be a gene thing...as you say females arent normally so defensive and agressive....

Wow you've got a psycho BN

I agree with Curby it could be genetic or possibly hormonal, it's unusual whatever the cause.