A young dolphin swum into the harbour 10 days ago.
The common dolphin was monitored by Jersey vets and volunteers from the British Divers Marine Life Rescue, who said she was healthy and feeding well.
However, it is thought the animal was so young, it should probably have been with its mother.
A young dolphin has been spotted swimming just off La Collette basin for the past few hours.
John Hamilton from New Era Vets says the animal is a Common Dolphin and is probably a juvenile.
He added that it is potentially so young that it should be with its mother.
They are leaving the animal alone for now and are asking the public to do the same.
You can see the dolphin swimming below.
The weekend event coincides with International Pride Month and the 51st anniversary of the Stonewall riots.
The scheme has been backed by the island's Lieutenant-Governor, and is the first of its kind in the Channel Islands.
Sunny spells and isolated light showers. After dusk fair spells with isolated showers.