Lip locking chasing each other around the tank and other forms of rough behaviour can often be a pre-breeding ritual. Unfortunately there is only one sure way of knowing you have a breeding pair this will be when you actually see eggs being laid and the male fertilising them. All this moving around and cleaning up with the lip area is a very strong reason to believe it is the cause of the lump.

People often get very excited when they see their oscars doing this.

Oscar fish The oscar fish further likes digging in the sand investigating the place or rubbing its lips on a rock for cleaning purposes removing dirt. Common breeding signs to look for in oscars include lip locking between mates frequent chasing of each other through the aquatic environment shivering or shaking that is usually accompanied by tail lashing and even nipping and biting that can result in the violent removal of strips of flesh. A pair of fish will generally lock lips and have something of a tug of war. Each will attempt to dislodge the other one. At some point one of the fish will dislodge. Either prior to the lip lock or just after depending on the source the oscars will engage in some tail slapping and rubbing up against each other. The family cichlidae contains many fish infamous for their aggression and renowned for parental care of their young.

Locking lips means different things to different cichlids and can even change depending on the situation. Since it can signify either fighting or breeding a fish-keeper should pay attention when they The natural habitat of oscar fish. The native habitat of oscar fish is widely distributed throughout the amazon region including portions of venezuela bolivia colombia ecuador brazil peru french guiana argentina and uruguay. They have have always stayed close together and had locked lips a few times. I read that this could mean they may want to spawn together. Last week they started to lock lips more but for only a few seconds at a time.

I moved all the fish except a feather fin catfish. Today they had been locking lips for about an hour and had not stop.

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