River hosts shark acrobatics

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• Bull shark a travelling tourist

IT'S a phenomenon with which Brisbane River boaties are familiar, but scientists are at a loss to explain.

Every year as temperatures rise, bull sharks can be seen leaping from the water and spinning through the air, sparking wonder among spectators and researchers alike.

University of Queensland professor in zoology Craig Franklin says despite up to a thousand bull sharks living in the river winding its way through the state capital, much of their behaviour is a mystery.

Particularly confounding is the sight of the sharks getting air time during warmer months.

It is a spectacle ferry drivers say they catch sight of up to four times a week.

See Brisbane Times for full story