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The wild clownfish are almost identical to the ones depicted in the movie Finding Nemo, in which a timid clownfish living off the Great Barrier Reef goes in search of his son.

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.

Fish similar to those made famous by the movie Finding Nemo are shrinking to cope with marine heatwaves, a study has found.

If it wasn't for Nemo, Switzerland wouldn't be hosting this year's Eurovision Song Contest.