Director of Autism Guernsey, Andrew Sparkes, said more than 1,000 people had taken part in the trail which he said had “brought joy, colour, and community spirit to Guernsey”.
“The Dolphin Discovery Trail has been a wonderful example of Guernsey coming together for a cause, and the upcoming auction is a chance to make a lasting difference while taking home a unique piece of art,” he added.
GSPCA manager Steve Byrne said the response to the trail had been “incredible to see”.
He said: “The Dolphin Discovery Trail has brought so much joy to the island and we’re incredibly grateful to everyone who took part, sponsored a dolphin, or helped behind the scenes.”
The dolphin-themed trail followed similar events in recent years including the Puffin Parade in 2023 and the Golden Guernsey Goat Trail in 2021.