A conference focusing on the sustainable use of the world's oceans seas, lakes and rivers is under way in the Kenyan capital, Nairobi.

Thousands of delegates from around the world including researchers and conservationists are expected to attend the three day Sustainable Blue Economy Conference which Kenya is co-hosting with Japan and Canada.

The conference organisers are expecting countries and companies to make commitments to help ensure the world's water resources are protected for future generations.

The event will look at the impact of climate change on the world's water resources, how to prevent overfishing and how to minimise pollution which is having the greatest impact on the least developed countries.