We drove down to the seaside city of Mandurah (say ‘MAN-duh-rah’) on Saturday (the day after Christmas, called ‘Boxing Day’ here), about an hour’s drive south of Perth. The Peel-Harvey estuary is heavily used for recreational boating and fishing. It is now mostly salt-water, after the construction in 1994 of a channel that let seawater push in with the tides. Still, the estuary is home to the blue swimmer crab, the western king prawn and fish such as black bream and cobbler, and is even visited occasionally by dolphins.