Lake Malawi is classified as a Unesco World Heritage site due to its diversity of endemic fish.
Sediment cores from Lake Malawi in southern Africa show colder weather from 1570 to 1820.
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He described the accident as the worst to happen on Lake Malawi for more than 50 years.
The death toll in Saturday's boat disaster in the central reaches of Lake Malawi has reached 17.
The victims included a husband and wife visiting relatives on the islands of Likoma on Lake Malawi.
Lake Malawi contains more than 400 species of the brightly colored fish, all but five endemic to these waters.
CNN: Rangers struggle to save endangered fish in Lake Malawi
Low water levels on Lake Malawi have forced the steamers to anchor offshore at most ports along the lake.
These conditions make Lake Malawi an extraordinary place for freshwater scuba diving.
The Oxford team reasoned that if this perturbation was so great, it ought to be evident in the sediments of Lake Malawi.
"We don't want to see Malawi and Tanzania get to the point where they are fighting for Lake Malawi's oil, " he adds.
CNN: Troubled water: Oil search fuels tension over Lake Malawi
In the dry landscape surrounding Lake Malawi, there are precious few options.
CNN: Rangers struggle to save endangered fish in Lake Malawi
" The IUCN report said: "In Lake Malawi, a group of fish, known as 'chambo' by locals, forms an extremely important source of food.
CNN: Rangers struggle to save endangered fish in Lake Malawi
Lake Malawi, also called Lake Nyasa, is the second deepest body of freshwater in Africa and one of the deepest in the world, reaching a depth of 706 meters.
Lake Malawi is a UNESCO World Heritage site and UNESCO says the lake's importance for studying the evolution of fish is comparable with finches in the Galapagos Islands.
CNN: Rangers struggle to save endangered fish in Lake Malawi
The researchers, from the University of Washington and University of California Berkeley in the US and the Natural History Museum, re-examined a number of bones that were first collected from what is now Lake Malawi in southern Africa.
Police spokesman Oliver Soko said a massive joint police and Malawi Lake Services rescue operation is underway around Chipoka Harbour where the overloaded boat capsized.
Serving Malawi, Tanzania and Mozambique, the 579km-long lake is accessible in Malawi via the towns of Mangochi or Monkey Bay in the south and via Mzuzu, Karonga or Nkhata Bay in the north.
If generations to come are to benefit from the lake -- from its food and potentially its oil -- then Malawi's government faces a challenge of leadership and resource management.
CNN: Troubled water: Oil search fuels tension over Lake Malawi
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