A 37-year-old farmer has been cautioned for throwing offal at Fisheries Minister Ben Bradshaw during a pro-hunting demonstration.
The missile struck Mr Bradshaw on the face
Mr Bradshaw received a cut near his right eye after the protester threw a piece of hollowed-out fruit containing entrails at him in Exeter in January.
Devon and Cornwall Police arrested the man, from Ashburton, on Wednesday on suspicion of assault.
He was questioned before receiving an official caution and released.
Mr Bradshaw was attacked as he arrived to speak at a conference on the South West's fishing industry in his constituency of Exeter on 17 January.
That morning about 70 pro-hunting campaigners, who had assembled outside County Hall, shouted slogans as Mr Bradshaw arrived and one threw the offal.
The man cautioned for throwing the offal made a full apology to Mr Bradshaw and gave a donation to the Fishermen's Mission.
Mr Bradshaw said: "The police did warn me that they were going to interview somebody, and asked how I would wish to proceed.
"I said I would be happy with a caution and a donation to the Fishermen's Mission, the charity which looks after the families of fishermen who are lost at sea."
He added: "I have always defended people's rights to protest peacefully, and will continue to do so - that is a basic democratic right.
"Unfortunately quite a lot of the protests staged by the (pro-hunting) Countryside Alliance have not been peaceful."