These dolphins were using the retaining wall as a fish trap, with one staying further out from the wall, and perhaps helping by herding towards the wall, where the other one could catch them.
As a post-script, a friend who has been recording dolphin activity in the Swan River has used the markings on the fins to identify the individuals -
www.riverguardians.com/projects/dolphin-watch/
The mother appears to be "Pirulli", so presumably her companion would be her two year old calf named "Soul".
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