A number of orange lifebuoys have been found to have been 'deliberately' thrown into the water.
Jersey Coastguard say misuse of the devices is could have fatal consequences, if they aren't available in an emergency.
Coastguard and VTS Manager Dan Downey wants anyone who is throwing the buoys in the water to 'think again'.
"Discarding a lifebuoy into the harbour when it isn’t needed is vandalism and could cause death or life-threatening injury if the equipment is then not available when it’s really needed by someone who’s in trouble in the water."
There are 128 'strategically placed' flotation rings around the island's coast, which are designed to be thrown in the water for someone in distress.
Islanders are asked to report any damaged or missing life buoys to the Coastguard on 01534 447705.
Saturday passenger sailings to the UK from Jersey cancelled for four weeks
Acorn to increase prices of second-hand clothes and shoes
'Definitely a need' for islanders to have their say on fireworks
New fire safety rules for tall blocks of flats set to come in April 2027
Minister prioritises international-sized cricket pitch
Mum of murdered student urges reporting of non-contact sexual offences
£6 zoo entry for people on Income Support
Charity opens supports to pay upfront nursery fees
