Thousands of fish have been relocated from a stretch of the Leeds-Liverpool canal in Lancashire because of low water levels.
A 60-mile stretch of the canal between North Yorkshire and Wigan has been closed to save water because of current drought conditions.
The idea is to preserve supplies in the North West's reservoirs, which despite recent deluges are below normal levels.
Some parts of Greater Manchester were flooded on Thursday after heavy rain.
British Waterways said species such as bream, roach and perch were among those being moved in the operation at Barnoldswick.
Electric currents were passed through sections of the canal to stun the fish so they could be scooped up with nets, placed in buckets and moved upstream.
Ian McNeil, carrying out the operation for British Waterways, said about 4,000 fish were being moved throughout the day.
Up to 3,000 fish in water pools in Gargrave, North Yorkshire, were moved to other parts of the waterway during a similar operation on Thursday.
Water company United Utilities, which imposed a hosepipe ban across the region last month, said supplies remained low.
Reservoirs in Pennines, where there has been less rainfall, are only about half full, compared to normal levels of 68%.