Farage, who heads the UK Independence Party, said he would board a trawler at the head of a 60-boat procession which will sail to the Houses of Parliament on June 15 in a mass protest organised by campaign group "Fishing for Leave".
"It will be big, visual and dramatic, and the demand will be clear -- we want our waters back," he told LBC radio, arguing that Britain's fishing industry was in decline because of European Union quotas.
Cameron visited a brewery to make the case for staying in, after a challenging performance in a live question and answer session on television yesterday evening.
His justice secretary Michael Gove, who backs Brexit, is due to face a similar grilling on Sky News later.
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Guardian/ICM polls published on May 31 showed the "Leave" vote with 52 per cent compared with 48 per cent for "Remain" in a surprise result that immediately sent the pound sinking against the euro and dollar.
In the first live broadcast event of the campaign, Cameron was accused by a 22-year-old student of "scaremongering" and running a "complete shambles" of a campaign.
Facing an often hostile audience, the prime minister warned that "Leave" would be an act of "economic self-harm"
"Cameron savaged as voters revolt," read a front-page headline in the Daily Telegraph, while the Daily Mirror said he "took far more blows... Than he would like" and The Sun described it as a "tense clash".
At an event with finance minister George Osborne, Jamie Dimon, the chief executive of JP Morgan Chase, said leaving the EU could put at risk some of the US bank's 16,000 jobs in Britain.