I have been wondering whether the feeding cormorants could be disturbed by the regular use of a drone. This could be used when they are both feeding or resting and would not directly harm the birds, something that needs to be avoided at all costs. The regular disturbance may 'persuade' them to feast elsewhere. Drones are not excessively expensive although if one of our members could borrow one it could be trialed to assess whether this was an effective control measure.
A drone may also have an use in disturbing poachers.