Bull shark numbers a mystery as industry strives to understand their behaviour

An apparent increase in the number of bull shark sightings in the Swan River us far upstream as Guildford has fishers and the industry concerned, while biologists are pushing to understand as much as they can about these now-common marine creatures.

A number of recent incidents in WA waters have been blamed on bull sharks, a fact that has renewed the statement from ecologists and others: you are in their territory.

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