The black and silver sea sport vehicle – a 4-Stroke WaveRunner carrying the number AF-346 – was found at Seymour slip.
Unable to identify the owner, Jersey Coastguard is now asking islanders for their help.
“If anyone can identify the owner or has any information on this, please contact Jersey Coastguard,” they said in an appeal for information on social media.
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Jersey Coastguard can be contacted via email or telephone on 01534 447705.