The 26m whitefish trawler Sedulous had five crew on board when it went ashore around the north end of the island as it was leaving Scalloway Harbour for fishing grounds to the west of the Scalloway Islands, just after 3.30am.
Another local trawler, the Radiant Star, was already in the area and had offered its assistance, along with Scalloway Harbour pilot boat Lyrie.
After waiting for the tide to rise, the Radiant Star crew were successful in establishing a tow line with Sedulous, and managed to pull the boat back to deeper water before any serious damage was done.
The Sedulous was then able to return to port in Scalloway under her own steam, escorted by the RNLI Charles Lidbury, and the Aith lifeboat returned to station by 8am.
Aith RNLI lifeboat coxswain John Robertson said: “Life-threatening incidents can happen at sea at any time. So it’s important that you call for help when something goes wrong.
“I’d like to thank the crew of the Radiant Star for their safe and essential assistance this morning. Their quick, competent response was an important part of getting Sedulous and her crew back to safety.
“Local RNLI crews are always ready to respond, and I’m pleased that we once again assembled so many volunteers so quickly.”
John added: “This was our first callout since the recent outbreak of the coronavirus in Shetland, at a time when many folk are self-isolating or social distancing.
“Helping slow the spread of this virus ensures that our volunteers remain healthy, and are able to keep helping save lives at sea.”