President John Magufuli and Chinese Foreign Minister Wang Yi oversaw the signing of the contract at an event broadcast live on state television.
Scientists found that the endangered animals in Ruma National Park, a protected area on shores of Lake Victoria, had developed alarming levels of antibiotic resistance.
Dozens more feared dead as pleasure boat sinks in Lake Victoria, in latest such incident on Africa's largest body of water.
Bodies continued to float to the surface around the vessel, which initial estimates suggested had been carrying more than 300 people.
Tanzanian President John Magufuli has ordered the arrest of the management of ill-fated ferry as scores more are still feared missing as rescuers continue to search for survivors the day after the disaster.
The weather at Lake Victoria is unlike any other place on earth with thunderstorms and lightning strikes killing around 5,000 people a year.
East Africa’s Lake Victoria, one of the world's largest freshwater lakes, is under threat from heavy pollution that could affect the livelihoods of millions of people.
The earthquake was felt as far away as Rwanda, Burundi, Uganda and Kenya, the US Geological Survey said.
As many as 15 people stormed the mosque, killing the imam and two others in Tanzania's Mwanza city.
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