US endurance swimmer Diana Nyad's team says she made it through her first night in the Straits of Florida with almost no sightings of poisonous jellyfish.

A post on Ms Nyad's blog says she is doing well and the crew is upbeat, though she expressed some fatigue during a pause to eat. Doctors examine her regularly and say "she's looking very good".

The 64-year-old is trying to become the first person to swim from Cuba to Florida without a shark cage.

It's Ms Nyad's fourth attempt at the feat in the last three years. She also made an unsuccessful try with a cage in 1978.

If she is successful this time, she expects to take about 80 hours to reach the Florida Keys.

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