内容摘要：The first incident took place about 100km (62 miles) from the Ukraine border.

The first incident took place about 100km (62 miles) from the Ukraine border.

Sam's parents said he was "adored by his family" and described him as "loyal, funny and fiercely protective".They added the Race Across the World experience "opened Sam's eyes to the wonder of adventure".

Sam's uncle Jonny Gray told the BBC: "What you saw was what you got. Sam loved gardening, animals and doing physical activity."Mr Gray said his sister Jo and Sam had a "special relationship" and were an "enormous hit on the show", adding: "The public really loved them."Emon Choudhury, who won the second series with his nephew Jamiul,

that Sam was "pure sunshine in human form" whose "kindness was a beacon for anyone lucky enough to cross his path".He added that Sam and his mother "showed us what it truly means to live fully, love fiercely, and embrace every moment with an open heart".

In a statement, a Race Across the World spokeswoman said: "Everyone who worked with him and indeed everyone who watched Sam could see just how precious and transformative the trip was for both him and his mum, Jo.

"Sam embraced the seven-week trip with an energy, love and a determination that saw the pair enjoy adventures across Mexico to Argentina making audiences fall in love with them and their special bond as a result.They found the tiny fish didn't just lose weight but got shorter by several millimetres. And it wasn't a one-off - 75% of fish shrunk at least once during the heatwave.

Dr Rueger explained: "It's not just them going on a diet and losing lots of weight, but they're actively changing their size and making themselves into a smaller individual that needs less food and is more efficient with oxygen."The fish may be absorbing fat and bone, as has been seen in other animals, such as marine iguanas, although this needs to be confirmed through laboratory studies.

Dr Rueger joked that a little bit of movie rewriting might be necessary, with a new chapter ahead for Nemo."The movie told a really good story, but the next chapter of the story surely is, how does Nemo deal with ongoing environmental change?" she told BBC News.