The future of household pets looks like the Night Pearl, a genetically-modified tropical fish that glows in the dark and doesn't need aquarium lights. This could lead to a revolution in designer pets, including non-allergenic cats, odourless dogs, and exotic-looking pets requiring very little maintenance and doubling as lighting fixtures, as well as numerous unintended consequences:

And that is the scenario that worries British aquarium enthusiasts. 'One idea being explored is to add genes - taken from cold water fish - that will allow tropical fish to live in unheated aquarium,' said Derek Lambert, editor of Today's Fishkeeper. 'Just imagine what would happen if they got released. You could end up with strange coloured GM tropical fish in our waters.'

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