According to the States Prison Service Annual Report for 2015, 209 violent incidents were reported in the prison last year, compared to 125 the year before.
But the overall number of incidents serious enough to be reported as assaults fell to 19 – down from 21 in 2014.
Attacks on prison staff also fell last year, with just four recorded compared to 12 in 2014 while a total of 17 reports of bullying were made during 2015, prompting 21 anti-bullying investigations.