The window of the control hut on No. 1 Ramp was broken last week, and the circumstances are still under investigation.
Guernsey Ports has also reported fishing tackle caught on vessels, masts and aerials, lures found in rigging, young people climbing ladders at the Fish Quay, and young gulls tangled in discarded line and hooks.
‘We have seen an increasing number of incidents over recent months that are creating unnecessary risks to other people, wildlife, vessels and harbour infrastructure,’ said assistant harbour master Mike Harris.
‘We want recreational angling to remain a part of harbour life. However, if these incidents continue, we will have to consider whether additional measures or restrictions are required in some locations to protect public safety and harbour operations.’
Mr Harris said the vast majority of anglers used the harbour responsibly, and the authority would rather work with them than impose restrictions.
Tim Froome, speaking on behalf of the local angling clubs, said they fully supported efforts to protect the harbour.
‘We condemn the actions of a small minority whose behaviour has resulted in criminal damage and threatens the reputation of the wider angling community,’ said Mr Froome.
‘We hope that through education, engagement, and collective responsibility, further restrictions can be avoided and access preserved for the many anglers who use the harbour appropriately.’
With the Castle lighthouse area closed while Castle Bridge is being rebuilt, Guernsey Ports said more anglers may be fishing from other parts of the harbour, making it more important to clear up afterwards.
Anglers are being asked to dispose of line, hooks, bait and other waste properly, using the bins provided.
They should also avoid casting where it could affect vessels, equipment or other people, report any damage or safety concerns, and follow signs and safety guidance.
Parents are being urged to remind young people of the dangers of climbing harbour structures, especially ladders and quaysides at low water.
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