A small pleasure boat with three men on board was rescued near the Britannia Bridge after suffering damage to its propeller.
The 16-foot vessel was anchored in the navigable channel in the Menai Strait on Tuesday evening after it lost propulsion.
The RNLI's inshore lifeboat from Beaumaris was called out at 7.40pm to assist and found it was causing a navigational hazard.
The boat was towed back to the Plas Menai dock with the mobile coastguard team from Bangor on hand to help with the recovery.
An RNLI Beaumaris spokesperson said: "The boat crew did the correct thing in alerting the Coastguard to their predicament."
"This meant our volunteer lifeboat crew were able to reach the casualty quickly, assess the situation and take the best course of action to prevent the situation worsening. We would recommend that lifejackets be worn by everyone aboard whilst on a boat at sea."
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