Royal Marines will be stationed in inflatable boats along the length of the Boat Race course on Sunday to ensure the event is not disrupted by another protester, organisers said today.
Last year's race had to be halted when Trenton Oldfield swam into the path of the two crews and narrowly avoided being struck by an Oxford oar.
Oldfield, who claimed to be protesting against elitism, was released from prison in December having served seven weeks of a six-month sentence after being found guilty of causing a public nuisance.
More top news
Milder Atlantic air into the north with colder, Continental air into the south.
A report produced for the British government criticised the security at the Riu Imperial Marhaba hotel where 38 people were killed in 2015.
A second Scottish independence referendum is "even more likely" after Theresa May's Brexit speech, Nicola Sturgeon has said.