Aggressive Rasbora

JCW_1

Fish Fanatic
Joined
Jul 2, 2022
Messages
63
Reaction score
14
Location
UK
My mother has a tank with 8 Scissortail Rasbora. For two months they have been fine, but one in particular has turned super aggressive and keeps attacking the other Rasbora.

Last week she lost a Rasbora due to a vicious attack, but we are unclear if this was the aggressive Rasbora or another fish (Columbian tetra) which may have triggered the aggressive behaviour. There are no signs Columbian tetra are aggressive.

Something has happened to trigger aggression and we can't figure it out. Does anyone know what could turn a rasbora into an aggressor? I am unclear why it would feel threatened in a group or why it has suddenly turned aggressive.
 

Byron

Supporting Member
Tank of the Month!
Joined
Feb 25, 2009
Messages
19,118
Reaction score
11,020
Location
CA
The aggressor is much more likely to be one (or more) of the Columbian Tetras. This species is Hyphessobrycon columbianus, and it is known to now and then nip fins of other fish. This is much more probable than the aggressor being one of the rasbora, Rasbora trilineata, though nothing can ever be certain.

Numbers are critical with all shoaling fish, and aggression is the usual reaction if the species group is less than 10, but 8 rasbora should not be a problem. It is much more likely the tetra, and the group size is not mentioned.
 

Most reactions

trending

Staff online

Members online

Top