2 Yellow Labs Mimic Eachother Movements

[XFiSh_CichildX]

hello my dad has a few yellow labs in his tank he also has some fry from the yellow labs but im sitting here watching the tank and i see two yellow labs mimic each other and now there going round in circles is this them mating again ??

they keep opening there mouth wide at eachother

 

[elisew]

I may be wrong but that behaviour sounds more like a bit of aggression, possibly 2 males sorting out a territory? My labs do it all the time.
If it was a male and a female you'd be likely to see them 'going around' on a flat surface or on the sand and it's much slower, this is them spawning and the female would be picking up fertilized eggs from the flat surface.

 

[XFiSh_CichildX]

ok i thought it would be them mating cus one is deff a female cus she already had fry and they started circling so i thought mmmm mateing thanks