Background: Sea lice 'breakthrough' for salmon farmerspublished at 14:55 Greenwich Mean Time 6 February 2019
Two of Scotland's biggest salmon producers say they have made a breakthrough in the rearing of so-called cleaner-fish to tackle sea lice.
Until now, most of the wrasse used in salmon cages have been taken from the wild, which has caused huge concern among environmental groups.
But researchers say they have been able to "complete the life cycle" by rearing their first brooding stock.
They hope to become self-sufficient in the fish within the next three years.