Five years after the hit film that endeared the clownfish to audiences worldwide, Nemo is increasingly difficult to find. The tropical species, immortalised in the movie
, is facing extinction in many parts of the world because of soaring demand from the pet trade. Dr Billy Sinclair, of the University of Cumbria (UK), who has been studying clownfish populations for five years, says the species should now be listed as endangered. Studies of clownfish on Australiaâs Great Barrier Reef have revealed a dramatic population decline. Shoals that used to number dozens of clownfish have dwindled to just a few specimens, leaving them with difficulty breeding, Dr Sinclair says.