Scientists have created the ultimate pet: genetically modified fish that glow in the dark. In future, there will be no need for aquarium lights – fluorescent fish will provide their own illumination.

And that is just the start. Scientists believe Night Pearl bio-fish represent the shape of pets to come. Our household animals will come with extra genes that will stop them shedding fur or triggering allergic reactions. And when one dies, its owner will simply clone it.

But the prospect of GM pets has outraged pet dealers. The nation’s aquarium industry last week said it had backballed the Night Pearl. ‘This is the thin end of the wedge,’ said Keith Davenport, chief executive of the Ornamental Aquatic Trade Association. ‘You could put all sorts of different genes in animals and do all sorts of damage.’

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