 Serious adult crime and violence is a social problem despite decades of intervention and prevention work. One of the reasons for the world-wide failure to prevent this problem stems from a a failure to tackle the biological component of the crime violence equation in treatment programs, and b the failure to tackle this adult condition in its formative childhood origins. Investing modest resources in early biosocial prevention programs could yield enormous long-term financial dividends in terms of the saved legal, medical, social, and psychological costs resulting from adult crime. This initial study would be the first to test the efficacy of conjoint Omega-3 plus social skills training, and the first to identify possible mechanisms by which Omega-3 reduces antisocial behaviour. 