The man, who had been taking photographs, was pronounced dead on arrival at the Naivasha District Hospital, while another tourist survived the attack on Saturday evening, according to the Kenya Wildlife Service.
“We are tracking the hippo,” it said on Twitter.
The agency named the dead man as Chang Ming Chuang, 66, and the survivor as Wu Peng Te, 62.
On Sunday, Kenyan newspaper The Star quoted the head of a boat owners’ association in Navaisha as saying that higher than normal water levels were causing hippos to wander from the lake on to nearby farms and hotel properties searching for pasture.
Tourism is one of the country’s main sources of foreign exchange and nearly 1.5 million tourists visited Kenya last year, according to the tourism ministry.