Hythe Marina occasionaly uses birds of prey and sharpshooters but I think someone complained about the culling so I think that stopped, it seems there will always be a do gooder to ruin things
The bald eagle is a bit over the top but gorgeous nonetheless. Port Solent has managed to get rid of most of the rigging-roosting starlings by paying a falconer to fly his Harris' hawk at them at regular intervals over several seasons. Impressive bird - about the size of a buzzard.
The Freeport Shopping Centre at Fleetwood Marina uses one of the audible bird scarers.. seems to work somewhat, and you do eventually get used to the noise!
I dont think that seagulls will ever quite crapping every where, so i think i might pick up a drunk and give him a shotgun and tie him to my boat. Should keep them away.
We've used a relatively small-meshed green coloured plastic netting for 2 years and have never had a problem with roosting or snared gulls. I think that if the mesh is under about 50mm then you should be ok. It's available at a lot of DIY or Garden Centres.
Hasn't stopped the buggers flying over and bombing us though /forums/images/graemlins/mad.gif
In a local garden centre I saw this 'bird scarer' for gardens. It is a light nylon line like fishing line and when stretched between poles etc it emits a humming sound which 'apparently' deters the little sods from perching. Cannot comment on efficacy. Personally I use a big black ugly plastic crow swung up to the spreaders which has had a very good effect.