Guests who fight onboard could face a $500 (£415) fine under the strict new rules and could be reported to law enforcement.
Duffy ended the video, saying: “Please help us make sure your Carnival vacation is safe, fun and memorable, by respecting each other, our crew and the ocean.”
Around eight people were involved in an altercation on a Carnival cruise ship in July, with some incurring injuries.
At the time, a Carnival Cruise Line spokesperson said those that started the incident would no longer be able to sail on its ships.
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