It was timed to coincide with World Oceans Day which takes place annually on 8 June.
WOD is campaign intended to raise awareness about the importance of the marine environment globally.
‘We wanted to bring together all the different organisations that are working in environmental protection and sustainability with the sea,’ said CET community engagement lead Helen Quin.
Activities on offer included yoga, beaching cleaning, swimming and various talks.
The States has already made positive steps by setting up the Strategy for Nature and the Climate Change Policy and Action Plan, according to Miss Quin.
‘Since the development of those, people are taking things more seriously but we need to act as a community and buy into it,’ she said.
Pierre Ehmann from the CET had erected a frame on which he had hung some of the items of rubbish he had recovered from local beaches this year.’
‘I’ve collected two tonne bags full so far and I know that the CET have collected more,’ he said.
‘I wanted to create something that people could walk through and put themselves in the position of marine life that had to swim through it.’