By Rebecca Morelle
Science reporter, BBC World Service
The potential risks of genetically modified fish escaping into the wild have been highlighted in a new study.
Scientists from Canada have found that transgenic Atlantic salmon can cross-breed with a closely related species - the brown trout.
The fish, which have been engineered with extra genes to make them grow more quickly, pass on this trait to the hybrid offspring.
The research is published the Proceedings of the Royal Society B..
However, the biotech company AquaBounty, which created the salmon, said any risks were negligible as the fish they were producing were all female, sterile and would be kept in tanks on land.
The transgenic salmon are currently being assessed by the US authorities, and could be the first GM animals to be approved for human consumption.
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