(CNN) The Japanese organizer of the World Cup sailing competition has apologized for its decision to open the event near Tokyo with a show of captive dolphins performing tricks.

The Japan Sailing Federation issued the apology Tuesday after participants criticized the performance, including British Olympic silver medalist Luke Patience.

"Couldn't be more embarrassed with what I'm witnessing," Patience tweeted following the event. "We are sailors, and apparently a 'green' sport."

He later apologized on social media for "any offense" that he may have caused, explaining that he was "shocked" that sailors would be taken to the dolphin aquarium for the ceremony.

"As a sport, I hope we can show more morality than this," Patience added.

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