While there are numerous types of sharks, only four are most frequently cited in encounters with humans—the bull shark, the tiger shark, the great white shark and the oceanic white tip shark.
"The bull shark is known for its aggressiveness," Landry says.
Among them is the Mekong giant catfish, which is the size of a bull shark, and the Mekong stingray, which can weigh up to 600kg.
Steven Fogarty, who suffered 40 puncture wounds to his leg, told how he survived the attack by punching the bull shark in the face. "Something just grabbed me from behind.
As evidence of the river system's health, our skipper points out a 2m bull shark as it leaps skyward and a brahminy kite wheels overhead.
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